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(1) Use transparent sheet fittings to obtain the best scanning effect

Many flatbed scanners are equipped with transparency fittings placed at the top of the scanner bed. In order to obtain the best scanning of transparent films or slides, remove the pictures from the rack and slide mounting rack and mount them on the glass scanning bed with the reverse side facing down (the reverse side is usually a rough surface). Cut out the mask with black paper and cover the entire scanning bed except where the manuscript is set. This will reduce glare and overexposure during scanning. Similarly, when scanning a three-dimensional object, cover the lid of the scanner with an object of a color that contrasts strongly with the object you are scanning. This will help you to select it more easily with PhotoshopColorRange.

(2) Maximize that color gamut of the scanned image

In order to make full use of the 30-bit or 36-bit scanner to increase the color range, the scanner software (such as FotoTune of Agfa) or other company's software should be used to adjust the color as much as possible. Because Photoshop software is limited to 24-bit images, images may be inserted with the widest color gamut range.

(3) Scan printing material by using non-screen printing technology

When scanning printing material, there will be netting in the continuous tone of the image. If the scanner does not have a screen removal function, try to find the resolution that minimizes the screen size. Often, the same or double resolution as the screen line of printing material may work. Once you get a fairly good scan, use Gaussian Blur filter (with a set of less than 1 pixel) of Photoshop to slightly soften the mesh until you cannot see it. Then use Unsharp Mask to sharpen the image back. Scanning can also be improved by slightly rotating the image because the continuously adjusted screen angle is changed. For black-and-white images, the rotation of 45 degrees is just right. For CMYK images, experiments will be required.

Scanners, including smart book scanner and high speed ocr scanner, are very convenient for us. So, it is necessary to know how to maintain them.

Protect the optical components

In the process of scanning images, the scanner converts analog signals into digital signals through a component called a photoelectric converter, which is then sent to the computer. This photoelectric conversion setting is very delicate, and the position of the optical lens or reflective lens has a great influence on the scanning quality. Therefore, in the process of work, do not casually change the position of these optical devices, and at the same time try to avoid vibration or tilt to the scanner. When the scanner fails, do not dismantle and repair it without authorization, but send it to the manufacturer or the designated maintenance station. In addition, when transporting the scanner, be sure to lock the safety lock on the back of the scanner to avoid changing the position of the optical accessories.

Keep regular cleaning

The scanner can be said to be a kind of delicate equipment, which must be carefully cleaned. If dust or other impurities fall on the glass plate, reflector, or lens in the scanner, the reflected light of the scanner will be weakened, thus affecting the scanning quality of the picture. Therefore, the scanner must be used in a dust-free or less dust environment. After using it, the scanner must be covered with a dust cover to prevent more dust. When it is not used for a long time, it should be cleaned regularly. When cleaning, you can wipe the dust off the shell with a soft cloth, and then carefully clean it with detergent and water. Then the glass plate is cleaned. Since the cleanness of the panel directly affects the scanning quality of the image, when cleaning the panel, first wipe it with glass cleaner, then wipe it with a soft dry cloth.

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In recent years, scanners have become an important part of families and offices. Scanner technology is ubiquitous and used in a variety of ways. A flat-plate scanner, also known as a desktop scanner, is the most functional and commonly used scanner. Let's learn how the scanner works together.

Working principle of scanner - introduction

As the third generation of computer input equipment after keyboard and mouse, the scanner is a high-precision photoelectric integrated high-tech product, using photoelectric technology and digital processing technology to input various forms of image information into the computer. It can scan, analyze and convert images such as photos, printed documents, or handwritten documents, or small objects such as ornaments into digital images by capturing images and converting them into the form that can be displayed, edited, stored, and output on computers. People usually use scanners to input computer images which are the most informative form, and at work, maybe you need a pdf camera scanner.

Working principle of scanner - structure

The components of a typical flatbed scanner include CCD array, reflector, scanning head, glass plate, lamp, lens, upper cover, color filter, stepping motor, balance rod, transmission belt, power supply, interface port, and a control circuit.

The CCD array is the core component of the scanner. CCD is the most commonly used technology in the field of scanner image capture. CCD is composed of a large number of tiny photosensitive diodes( light spots), which can convert photons (light) into electrons (charge). In short, each light spot is sensitive to light - the brighter the light incident on a single light spot is, the more charge accumulated in this light spot is. The scanned document image passes through a series of mirrors, color filters, and lenses to reach the CCD array. The specific arrangement of these components depends on the scanner model, but the basic principle is roughly the same.

Working principle of the scanner

The working principle of the scanner is not complicated, which can be basically reflected in its working process. Just like high speed camera scanner, it scans the original document optically, then transmits the optical image to a photoelectric converter to be converted into an analog electrical signal, and then converts the analog electrical signal into a digital electrical signal, and finally sends it to the computer through the computer interface.

The steps of scanning images by the scanner are as follows: firstly, the front face of the manuscript to be scanned is laid down on the glass plate of the scanner, and the manuscript can be a text or a drawing photo; after the scanner driver is started, the movable light source installed inside the scanner starts scanning the original. In order to uniformly illuminate the manuscript, the scanner light source is oblong and sweeps the whole manuscript along the Y direction. The light irradiated on the manuscript passes through a very narrow gap after being reflected to form a light band along the X direction, passes through a group of reflectors, and focused by an optical lens and enters a spectroscope, and three RGB color light bands obtained through a prism and a red, green and blue color filter respectively shine on respective CCD, the CCD converts the RGB light band into an analog electronic signal, and the signal is converted into a digital electronic signal by an A/D converter.

Now, the optical signal reflecting the original image is converted into a binary digital electronic signal acceptable to the computer and finally sent to the computer through serial or parallel interfaces. The scanner obtains one line of image information of the original document in the X direction every time it scans one line. As it moves along the Y direction, the original document is gradually formed inside the computer.

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1. PERFORMANCE PARAMETERS

① Scanning format: Scanning format usually has specifications such as A4, A3, A3+. Large-format scanners are more expensive. Generally, it's better for office users to use A4 format scanner than the A3 page scanner.

② Optical resolution: It reflects the clarity of the scanned image. The higher the resolution, the sharper the scanned image. Resolution is usually expressed in dots per inch of length dpi. "Highest resolution" is generally not used as a reference indicator. At present, the optical resolution of products with a higher market share is mostly 600x1200dpi and higher. It is recommended not to buy scanners with optical resolution below 300dpi.

③ Color digits: It reflects the ability to distinguish the color of the scanned image. The higher the number of color bits, the richer the color of the scanned image. 42bit (gradually increased to 48bit) refers to the number of color bits input, but the number of bits actually output to the computer is often not so high (generally 24bit), and this is the number of colors actually obtained.

④ Photosensitive element: It is the eye of the scanner. The common photosensitive elements used in the scanner are CCD and CIS. CCD technology is currently the most mature platform scanner and its performance is superior. CIS, often used in high speed portable scanner, are characterized as low-cost, lightweight, thin thickness, easy to carry, and suitable for the mobile office environment.

2. SUPPORTING SOFTWARE

In addition to the driver program and scanning operation interface, the functions of ordinary scanners or professional scanners must be implemented by corresponding software. For users unfamiliar with graphics processing, it is recommended to choose a matching scanner that provides simple operation. If you choose improperly, it is best to provide more detailed instructions in Chinese for scanners that have certain difficulties in operation. The selection of OCR software is very important for office users. When choosing, pay attention to whether they can recognize various printed handwriting, forms, and whether they can recognize Chinese and English mixed layout.

3. INTERFACE

It refers to the connection between the scanner and the computer. Common interfaces include SCSI interface, EPP interface, and USB interface (USB1.1 and 2.0), FireWire (1394). It is recommended to buy a USB2.0 interface. The USB interface scanner is fast and supports plug and play. It is very convenient to connect with the computer and has become the mainstream of the current peripheral interface.

4. BRAND SELECTION

Professional scanners are precision equipment. Therefore, when choosing a professional scanner, choose a good quality and durable scanner for libraries, archives, and public prosecution agencies. The non-contact unwinding and unwinding scanning method can scan the books and files without disassembly, which greatly improves work efficiency. The brand scanners have not only quality guarantee, but also perfect after-sales service.

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When using the scanner, do not change the position of the optical device at will and try not to make large vibration. In case of scanner failure, do not dismantle and repair the scanner without authorization, but send it to the manufacturer or designated maintenance station. At the same time, when transporting the scanner, be sure to lock the safety lock on the back of the scanner to avoid changing the position of the optical accessories.

Keep regular cleaning. If dust or other impurities fall on the glass plate, reflector, or lens in the scanner, the reflected light of the scanner will be weakened, thus affecting the scanning quality of the picture. Therefore, the scanner must be used in a dust-free or clean environment. After using it, the scanner must be covered with a dust cover to prevent more dust. When not in use for a long time, it should be cleaned regularly.

Don't forget to lock the scanner. In order to avoid damaging the optical components, scanners are usually equipped with special locking/unlocking structures. Before moving the scanner, the optical components should be locked.

Do not use an organic solvent to clean the scanner to prevent damage to the scanner housing and optical components.

Don't let the scanner work in a dusty environment. If there is dust on it, better to clean it with the handle air blower that is usually used to clean the camera lens. In addition, it is necessary to keep the scanner glass clean and undamaged, because it is directly related to the scanning accuracy and recognition rate of the scanner.

Do not plug the scanner with electricity. When installing scanners, especially those with EPP parallel ports, in order to prevent the motherboard from burning down, the computer must be turned off before plugging in.

7.Do not ignore the update of the scanner driver. Drivers directly affect the scanner's performance and involve the compatibility of various software and hardware systems. In order to make the scanner work better, updated drivers should be downloaded from its manufacturer's website frequently.

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Set the file size

No matter whether the scanned object is text, image, or photo, it will be output as an image by the scanner, and the size of the image is directly related to the size of the file capacity, so the size of the file should be set during scanning. Usually, the scanner can automatically calculate the file size when previewing the original manuscript sample, but knowing how to calculate the file size is more helpful for you to make appropriate choices when managing scanning files and determining the scan resolution, and it benefits the work of smart book scanner, high speed ocr scanner, etc.

Store curves and load scanning software

Sometimes, in order to get the best color and scanning contrast, first scan with low resolution. Open it in Photoshop, and use Photoshop's curve function to improve color and contrast. Save the curve and load it back into the scanning software. The scanner will use this color correction curve to create a better high-resolution file. If several images are scanned with a similar color gamut, the same curves can be used, and curves can also be stored frequently and loaded back as needed.

Place the scanned object according to the required effect

In the actual process of using images, it is sometimes hoped that images with oblique effects can be obtained. Many designers often input images into computers through scanners, and then use professional image software to rotate the images to achieve the rotation effect. However, this process is very time-consuming, and the image quality will decline according to the angle of rotation. If you know in advance how the image is placed on the page, then using the protractor and the bottom edge of the original to place the original at a precise angle on the cylinder and the platen, you will get the highest quality image without having to rotate in the image processing software.

Find the best scanning area on the glass plate

In order to obtain the best image scanning quality, find the best scanning area of the scanner, and then place the object to be scanned to obtain the best and most fidelity image effect. The specific searching steps are as follows: first, set all controls of the scanner to automatic or silent state, select all areas, and then scan a blank, white or opaque sample with low resolution; then use Photoshop, a professional image processing software, to open the sample manuscript. Use the averaging command (Equalize menu item) in the software to process the sample manuscript. After processing, you can see where there are cracks, stripes and black spots on the scanner. You can print this document and cut out the best area (that is, the most stable area) to help place the image.

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Usage of Scanners

1.1 Fine arts and pictures can be organized in documents;

1.2 It can scan and input the printed text into the word processing software to avoid the trouble of typing again;

1.3 The printed plate and panel label samples (even if the plate has no disk files and no photographic films) are scanned and recorded into the computer, which can design and copy the wiring diagram of the plate, thus solving the problem of plate making and improving the plate making efficiency;

1.4 It can realize automatic input and editing of PCB sketches, automatic input of Chinese character panels and complex icons, and modification of pictures;

1.5 It can add images to multimedia products;

1.6 It can integrate visual information in the literature to enable it to exchange and communicate more effectively.

The effective components of scanning, in addition to the scanner in the scanning system, consist of the following components:

The SCSI signal line connecting the scanner and the computer( usually USB).

The software that controls the scanner (the bridge between the scanner and the application program).

Image editing software, optical file recognition software, and printed board graphics automatic recognition software, etc.

A display for color or gray images.

Output equipment: black and white or color laser printer, thermal dye sublimation, graphic output machine, or other color printing equipment.

In addition to the above basic components, it can also be matched with the following additional equipment to endow it with more functions.

Transmission adapter (TMA) is used to scan transparent film material.

The Automatic Document Feeder (ADF) can automatically scan up to 500 pages of text material continuously.

Market demand

The scanner is a fully competitive industry regulated by the market. After years of development, the brand of the whole industry is flourishing. The force of product price above the middle end is weakened. Users pay more attention to product function, quality, and service. In the future, high-end scanner products of enterprises can be expected for better market performance.

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(1) Determine the appropriate scanning method

Scanners can be used to scan images, text, photos, etc. Different scanning objects vary from each other in scanning methods. Opening the scanner's drive interface, we found that the program provides three scanning options, of which "black and white" mode is suitable for documents in black and white, and "gray" mode is suitable for mixed layout of pictures and texts with both pictures with multiple gray levels and characters, and "photo" mode is suitable for scanning color photos, which requires multi-level sampling and storage of red, green and blue channels. Before scanning, it is necessary to select an appropriate scanning method according to the scanned object to realize a higher scanning effect.

(2) Optimize scanner resolution

The higher the scan resolution is, the clearer the image is. However, considering that if the resolution of the output device is exceeded, it is impossible to print a clearer image. It only takes up more disk space and has no practical value. Therefore, it is necessary to choose the appropriate scan resolution. For example, prepare to use a 600dpi resolution printer to output the results and scan at 600dpi. If possible, scale down large images after scanning. For example, if you scan a 4*4-inch image at 600dpi and reduce it to 2*2 inches in the editing program, its resolution is 1200dpi. And for higher resolution, you may need a high speed portable hd doc scanner.

(3) Set the scanning parameters

When a scanner pre-scans an image, it scans according to the system default scanning parameter values. For different scanning objects and different scanning methods, the effect may be different. Therefore, in order to obtain higher image scanning quality, the parameters can be adjusted manually. For example, when the brightness of grayscale and color images is too bright or too dark, the brightness can be changed by dragging the slider on the brightness slide bar. If the brightness is too high, the image will look white. If the brightness is too low, it is too dark. The brightness of the image should be moderate when dragging the brightness slider. Similarly, for other parameters, local modifications can be made according to the same adjustment method until their visual effects are satisfying. In a word, a good scanned image can meet the printing output without further adjustment in the image processing software and is the closest to the printing quality.

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Scanners are widely used in many places, but what are the specific usages and principles of scanners? Let the editor introduce to you what a scanner is, its purpose, and the working principle.

A scanner is an input device of a computer. Its function is to scan the appearance of written materials or physical objects such as pictures, photos, films, and manuscript data, input them into the computer and store them as files. In fact, the scanner has become the third most important computer input device after the keyboard and mouse.

Scanners come in many forms, such as black and white scanners and color scanners according to color. For example, a hand-held scanner, flat-panel scanner, and roller scanner are classified according to scanning mode. The flat-panel scanner has the characteristics of wide application, strong function, and moderate price. It has been widely used in many fields such as graphic image processing, electronic publishing, advertisement making, office automation.

Purpose of scanner

The scanner's duty is to save the photos, images in newspapers and magazines into the computer after scanning. In recent years, the scanner has a new function, which is often called "OCR". With this method, the characters written on paper can be automatically converted into editable files in the computer after scanning, thus greatly reducing the amount of typing. For different purposes, there are different scanners, such as book and document scanner, auto book scanner.

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Just like printers, scanner technology is also developing with each passing day and is becoming more and more humane. It is very beneficial for us to have a clear understanding of scanner technology development and future development trends. There are many different scanners, such as high speed portable hd doc scanner, pdf camera scanner, and so on. We will introduce the technological development of the scanner from the parameters which need to be paid attention to when purchasing:

Optical resolution

Optical resolution is the most important factor for us to choose and buy a scanner. Scanners have two major resolutions, namely, maximum resolution and optical resolution, which are directly related to the optical resolution normally used. The unit of scanner resolution is strictly defined as PPI, but it is also commonly called dpi by mistake. Ppi refers to the pixel number per inch. Transverse resolution is generally used to determine the accuracy of the scanner, because the longitudinal resolution can be controlled by the stepper motor of the scanner, while the transverse resolution is completely determined by the CCD accuracy of the scanner. In the beginning, the mainstream optical resolution was 300ppi, after 1999 it was about 600ppi and increased to 1200ppi after 2000, and the mainstream optical resolution has reached 2400ppi. Therefore, as ordinary users, we can buy 2400ppi optical resolution scanners.

Scan mode

This is mainly for the photosensitive element, which is also called the scanning element. It is the part of a scanner that completes the photoelectric conversion. In 1969, Bell Laboratory invented CCD(Charge Coupled Device), which is widely used in scanners because of its small size and low cost.

CMOS was born in 1998. It is a new image sensing technology. CMOS has the advantages of simple structure and lower manufacturing cost than CCD.

Also in 1998, CIS was born. CIS scanner is smaller than CCD scanner and its manufacturing cost is lower, but its quality is still not as good as that of CCD scanner. The former focuses on the CCD through the lens to convert optical signals into electrical signals for imaging, while the latter carries out contact scanning close to the surface of the scanned manuscript. Comparing the two scanning methods, it can be seen that CIS, as a contact scanning device, has a smaller depth of field and a poorer scanning effect on physical objects and uneven originals. The CCD scanner is focused on the CCD through the lens and is directly sensitive to light, so its depth of field is much larger than that of the CIS scanner, and it is very convenient to scan objects. In general, when we buy scanners, we usually choose CCD. Moreover, CCD scanners are also the most sufficient in the market.

Color digits

Color digits are an important technical index that the scanner can capture color level information. High color bits can obtain a higher dynamic range, and its color performance is more gorgeous and realistic. Color position affects the color saturation and accuracy of the scanning effect. The color bit has developed rapidly, from 8 to 16, then to 24, and then from 24 to 36.48. This is directly related to our increasing requirements for color restoration of scanned objects, so the larger the color bit value is, the better it is. However, 48-bit scanners are gradually moving into the mainstream.

Interface type

The interface of the scanner refers to the connection mode between the scanner and the computer host. The development is from SCSI interface to EPP (abbreviated as Enhanced Parallel Port) interface technology, but now it has entered the USB era and is mostly 2.0 interface. As a new industry standard, the USB interface has performed well in terms of transmission speed, ease of use, and computer compatibility. Since it was introduced in 1999, its share in the home market has been rising steadily and has become a recognized standard.

Software configuration and others

Scanner configuration includes software image, OCR and vectorization software, etc. OCR is a relatively important software technology in the scanner market. It realizes the function of converting images scanned from printed text into literal text, provides a brand-new text input method, greatly improves the working efficiency of users, and also brings progress to scanner application.

In addition, shortcut keys have become the trend of development. For home scanners, there are a series of other auxiliary technical indicators besides resolution, color bit, and interface type to enhance the usability and other functions of the scanner.

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One of the most common scenarios of using the projector is in the classroom, here’s a guidance on how to precisely use and connect the projector in class.

1. Connect the laptop and projector cable before turning on the power.

2. Lower the curtain: press the key to open

3. Turn on the projector: Press the ON button on the remote control. (Do not press any button other than the ON button to avoid changing the default settings of the projector.)

4. Turn on the laptop and press FN + F8 to switch to the projector (don't press if it has been switched over)

5. Turn off the projector: Press the OFF button on the remote control (STANDBY)

6. Raise the projector screen: press the lift key.

7. Shut down the computer

8. Wait until the indicator light on the projector no longer blinks and turns red, and hear a sound, turn off the power, unplug the projector and computer cable; and level the switch board of the lifting screen.

NOTES ON USING THE PROJECTOR

The multimedia projector is a valuable teaching equipment. It must be used and maintained in good habits and strictly in accordance with operating requirements.

1. The projector remote control should be managed by someone to avoid loss.

2. The projector-related equipment must be switched on and off in a certain order, and the projector cannot be switched on and off frequently (to avoid damage to the lamp).

3. Do not turn off the power immediately after the projector's remote control is turned off (because the projector is in a power-on and heat-dissipating state at this time, you must wait until the cooling fan in the projector is automatically turned off and cooling is complete before turning off the power). Wait for the fan sound to be heard before turning off the power (about 4 minutes).

4. Pay attention to dust, and never smoke when using the projector.

5. Try to keep the projector's working time within 4 hours each time (it should be stopped for 30 minutes before use when overheat protection occurs)

6. When opening and using multimedia equipment, use less or no chalk as much as possible to avoid the direct impact of chalk dust on multimedia equipment.

7. Protect the curtain. Do not touch the curtain with chalk, fingers or other objects. After the class, you should pack up the curtain in time to prevent the screen from deforming. When the electric curtain is lowered or raised, do not press the reverse switch. After any state is completed, the handle switch needs to be stopped.

8. The main socket should be closed every day after school to prevent accidental occurrence of the audio-visual equipment in the classroom when it is on standby.

PROJECTION METHOD OF PROJECTOR

Step 1: Connect the projector and laptop

1. Connect the laptop to the projector, press the power button to turn on the projector, and switch the computer screen to the projector.

2. It should be noted here that it is best to use the original connection cable when the projector is used. The length of the signal cable is generally not more than 15 meters. If it is too long, it will cause signal attenuation.

3. For a laptop with Windows XP system, open the laptop and press the keyboard combination key (Fn + F7) to switch the computer screen to the projector. Fn is a function key, and F7 is a computer screen output key. Due to the differences in notebook computers of different brands, the output keys are different, so it can be determined according to the specific notebook computer.

Step 2: switch the projector and monitor screen

1. The output key is generally one of F1 to F12, and has a small computer icon on it. The output key of most brands of laptops on the market is F7.

2. For a laptop with Windows 7 system, the screen switch combination key is: Windows + P. After pressing the combination key, fast projection management appears. In this way, press the left and right arrow keys to select.

3. At this time you can see four options: "Computer Only", "Copy", "Extended", and "Projector Only". "Computer only" means not to switch to an external monitor or projector. "Copy" is to display the same content on both the computer and the projector. "Expand" is to increase the display space of your notebook display and make the notebook display larger. You can put more windows on the desktop. "Projector only" means that the screen of the laptop itself is not displayed.

Step 3: Adjust the screen of the projector

1. When using the projector, you can adjust the size of the screen by moving the "size key" left and right according to the actual needs. If the screen is distorted, you can appropriately raise (or lower) the height of the projection or press the "keystone adjustment key" to adjust the screen.

2. After using the projector, press the "On key" of the projector's power. A prompt will appear on the screen to turn off the projector. Select "Off" and press "OK" to confirm.

3. At this time, please note that you must not unplug the power cord immediately. When the projector is turned off, it still needs some time to dissipate heat. At this time, the cooling fan will run quickly until the fan stops running before you unplug the power cord. .4. If you unplug the power supply immediately after turning off the projector, the projector will not get timely heat dissipation, which will seriously damage the hardware and its service life, so you need to pay more attention to this during the use of the projector.

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