The resolution of the scanner is determined from three aspects: the optical part, the hardware part and the software part. That is, the resolution of the scanner is equal to the resolution of its optical component, plus its own resolution by hardware and software processing.
Optical resolution is the actual number of optical scanner can capture optical components in the area per square inch, CCD refers to the scanner (or other optoelectronic devices) the physical resolution, the resolution is the real scanner, the value of which is numerical pixel level divided by the maximum size of the scanner can scan obtained by photoelectric element capture. Such as the resolution of 1200DPI scanners, often the resolution of its optical part of only 400 ~ 600DPI. The resolution of the extended part is generated by the combination of hardware and software, which is generated by mathematical analysis of the image by computer, which is also called interpolation.
Optical scanning and output are one to one, scan to what, what is output. After the computer software and hardware processing, the output image will become more realistic, the resolution will be higher. Most scanners on the market now have soft and hardware extensions for resolution. Some scanner ads write 9600 x 9600DPI, which is the maximum resolution obtained by software interpolation, not the scanner’s true optical resolution. So for scanners, the resolution has an optical resolution (or optical resolution) and maximum resolution. Of course, we’re concerned with optical resolution, which is hard work.
We say a scanner resolution up to 4800DPI (4800DPI is the optical resolution and software processing, difference sum) refers to the use of scanner input image in the scanning area, 1 square inches, can be collected to 4800 x 4800 pixels (Pixel). 1 inches square scan area, with 4800DPI resolution scanning, generated image size is 4800Pixel * 4800Pixel. When scanning the image, the higher the scanning resolution is, the more precise the image is generated, the larger the image file is generated, but the more interpolation elements are.
The common flatbed scanner is composed of light source, optical lens, scanning module, analog digital conversion circuit and plastic shell. It uses photoelectric components to convert detected light signals into electrical signals, and then converts electrical signals into digital signals through analog to digital converters and transfers them to the computer. When scanning an image, the light source to the image after the reflected light through the lens converged to the scanning module and a scanning module to convert optical signals into analog digital signal (the voltage, and it received light intensity), also pointed out that as the number of gray degree. The analog to digital conversion circuit converts analog voltage into digital signals and transmits them to the computer. The color is quantized by 8, 10, and 12 bits of the RGB tricolor, and the signal is processed into the image output of the above digits. If there is a higher number of quantization bits, means the image has more depth and level, but the color is beyond the scope of human’s ability to identify, so in the range resolution for us, the higher figure out the effect of color scanner is convergence smooth, to be able to see more detail.
Scanners and many other types, common in the following categories:
Handheld scanner. The handheld scanner, a technology developed in 1987, is shaped like a barcode scanner used by supermarket cashiers in their hands. The majority of handheld scanners use CIS technology, the optical resolution is 200dpi, there are black and white, gray, color and many types, of which the color type is generally 18 bit color. There are individual high-end products using CCD as a photosensitive device, can achieve bit true color, scanning effect is better.
Two 、 small drum scanner. This is the intermediate product of the handheld scanner peace desktop scanner (in recent years new, because the built-in power supply and small volume is called notebook scanner) this product most used CIS technology, optical resolution of 300dpi, there are two kinds of color and gray, color model is generally 24 bit color. There are also a small number of small drum scanners using CCD technology, scanning effect is significantly better than CIS technology products, but due to structural limitations, the volume is generally significantly larger than the CIS technology products. Design of a small drum is fixed and mobile scanner lens, to scan the object to scan through the lens, the operation like to scan the printer as objects to send through the machine, therefore, the object to be scanned can not be too thick. The biggest advantage of this scanner is that it’s small in size, but because of the limitations of using it, for example, you can only scan a thin sheet of paper, and the range can not exceed the size of the scanner.
Three 、 flatbed scanner. Also known as flatbed scanners, desktop scanners, at present most of the scanners in the market belong to flatbed scanners, is now the mainstream. These scanners have an optical resolution of 300dpi-8000dpi, and the number of colors ranges from 24 to 48 bits. The scan range is typically A4 or A3. The advantage of using flat like a copier scanner, as long as the cover is opened, whether it be of books, newspapers, magazines, photo film can put up the scan, very convenient, and scan effect is the best of all common types of scanners.
There are other large format scanners, large format scanning using the pen scanner, barcode scanner, film scanner (note not flatbed scanner and scan effect is much better, of course, the price is also expensive) real scanner (flat scanner, not a real scanning capability is somewhat similar to the digital camera), as well as the main used in the field of industry printing drum type scanner, a lot of.
According to the scanning size can be divided into A3 and A4 scanner; according to the scanning speed can be divided into high, medium and low speed: according to the structure characteristics, can be divided into handheld, flat, drum, paper feeding type (also known as the small drum), pen type scanner: according to the scope of application, can be divided into film scanner, 3D scanner, scanner, scanner, real engineering drawings of barcode scanner and so on.
Flatbed scanner, also known as desktop scanner, is currently the mainstream products in the market. It was born in 1984, according to the scope of use can be divided into high-grade professional flatbed scanner, medium and low flatbed scanner. The utility model is characterized in that the use is convenient. As long as the scanner is covered with a cover, books, newspapers, magazines, photos, negatives and the like can be put on scanning, and the scanning effect is better. This scanner generally uses CCD or CIS technology, because of its relatively low price, but also has the advantages of small size, fast scanning speed, scanning out of good quality so it has been widely used, in addition to the general application in the field of printing, the main products are – office and home users. Its optical resolution is 300 – 8000dpi (generally 600 ~ 1200dpi), and the number of colors is 24 – 48. Scanning format is A4, individual is A3.
Roller scanner is a scanner used in professional fields (such as high grade printing products). The objects are mostly large format drawings, high grade printing pictures and so on. Its technical specifications are among the first in the scanner family. With the printing. The development of roller scanner is better than that of design industry. At the same time, the development of supporting vectorization software and raster mode processing software has also pushed them into the professional market.
The photosensitive device of a roller scanner is a photomultiplier tube with an optical resolution of 1000 to 8000dpi and a color number of 24 – 48 bits. Compared with CCD and CIS, both sensitivity and noise factor are all far ahead of other photosensitive devices. But its output signal maintains the linear output height in a considerable range, almost without any modification can obtain very good color reproduction, so the use of photomultiplier tube scanner scanner is much more expensive than the other. At the same time, because the photomultiplier scanner can only scan one pixel at a time, the scanner scans at a slower rate.
I. features of engineering drawings and scanners
5 million pixels, A3 large format
The use of 5 million top-level high-definition camera, lift structure design, CAD engineering drawings can be taken, can scan A3 format.
Smart touch, LED lights
Engineering drawings by LED scanner lights a single high-power high brightness, and an arc astigmatic lens, light emitting more uniform brightness adjustable, more support to manually adjust the focal length, high-definition image easy.
Super OCR text recognition
Engineering drawing scanner equipped with a OCR file identification technology in the world, automatic layout analysis, can identify 180 kinds of forms of language text, tables, bar code, C++ and Java and special symbols, the recognition rate is up to 98%, mixed recognition support multi language, symbols and numbers, identification results remain the same with the original the image of the layout, and a key export to word or excel file.
Folding design, ultimate portable
Folding and telescopic design, simple stretching deformation can be switched to the working state in time. The folded size is similar to the long wallet. It can be held by one hand and convenient for storage. It does not occupy space and is easy to carry.
Two 、 the main functions of engineering drawings and scanners
Quick scan, one click complete
Mouse click the scan button, a key to complete the scan, the fastest only one second!
Flatbed scanners, also known as flatbed scanners and desktop scanners, were born in 1984 and are currently mainstream products for office scanners.
From the index point of view, such scanners optical resolution between 300 – 8000dpi, the number of color from 24 to 48 bits. Some products can be equipped with transparent film scanning adapter, used for scanning transparent film, and a few products can be equipped with automatic feed to achieve high-speed scanning. The scan range is typically A4 or A3.
In principle, the scanner is divided into two kinds of CCD technology and CIS technology, CCD technology from the performance is better than CIS, but because the CIS technology has the advantages of low cost, small size and other advantages, so it is widely used in a certain extent.
Business card scanner
Business card scanner, as the name suggests, can scan the business card scanner, with its small size and powerful identification management function, become many people office personnel most capable business little assistant. The business card scanner is composed of a high-speed scanner plus a slightly higher quality OCR (optical character recognition system), coupled with a business card management software.
At present, the main functions of the mainstream business card scanner are high speed input, accurate identification rate, quick search, data sharing, original reproduction, online transmission, and the introduction of PDA as the basic standard. In particular, the use of computers to connect to PDAs or mobile phones is becoming more and more important to users. In addition, the business card scanner is easy to operate and portable, and it is also the two aspect of the comparison.
The film scanner also called film scanner or contact scanner, the scanning is a flatbed scanner + through sweep can not match, the main task is to scan all kinds of transparent film, scanning picture machine from 135 film to 4*6 inches or greater, the minimum optical resolution over 1000dpi in general can reach 2700dpi level, higher precision products is a professional grade products.
Drum type scanner also called feed scanner or a small drum type scanner, drum type scanner was born in the early 90 generation, because the flatbed scanner is expensive, hand-held scanner width, in order to meet the needs of A4 format file scanning, launched this product, this product is the most used CIS technology, optical resolution 300dpi, there are two kinds of color and gray, color model is generally 24 bit color, there are few and drum type scanner using CCD technology, scanning is better than CIS technology products. However, due to the limitations of the structure, the volume is generally significantly larger than the CIS technology products.
With the price of flat-panel scanners down, such products also left the stage of history around 96-97 years ago. But around 2001 and the emergence of a new product, the biggest difference between the product and the old product is very small, and even some with built-in battery powered, no external power supply, depend directly on the internal power supply of computer, the main purpose is matched with a notebook computer, also known as the notebook scanner.
The scanner usually uses the cold cathode lamp tube, which is a high brightness and no radiation tube. It is not harmful to the human body. Please feel free to use it. It’s like a high brightness fluorescent lamp. If you say what might hurt, don’t look at the light with your eyes, or you’ll do harm to your eyes.
The rapid development of science and technology in today’s electronic products such as mobile phone, TV, microwave oven, air conditioner, refrigerator, computer network, office automation, improve work efficiency, and brings convenience to the family, to enrich people’s life. However, these products also have two sides, which can directly or indirectly affect the health of the body.
When an electronic product works, it sends out electromagnetic waves, also known as electromagnetic radiation. Electromagnetic radiation on the human body produces a range of biological effects. 150~1200 MHz band, can penetrate more than 2 centimeters of the body, stimulate the deep cells of the body, so that they rub each other, heat, and interfere with their own biological currents. Electromagnetic energy is converted into heat energy in the body, causing the imbalance of heat balance in human body. It can cause “microwave cataract”, destroy the spermatogenesis of testis, lead to infertility, and cause the change of cardiovascular function. The nervous system of children is delicate, and if the brain is retarded by a powerful electromagnetic radiation, the circadian clock is disturbed. For pregnant women are prone to miscarriage, premature delivery, and even lead to fetal malformations.
Medical experts in Italy report that 400 children suffer from leukemia each year in China, where 2~7 year old children suffer from electromagnetic radiation that is too close to the electromagnetic field. The data from Poland point out that people with frequent exposure to electromagnetic radiation have 2 times as many cancers as normal people. The British Royal microwave Research Institute found that people who work with electromagnetic radiation often have 6.4 times as many brain tumors as normal people. Medical experts in Finland have shown that women in the air service are twice as likely to develop breast cancer than women of the same age. Medical reports in Britain, the United States and Canada also point to higher rates of skin cancer and brain cancer among people on board. And things like air conditioners, refrigerators, televisions, computers can cause different or similar conditions. Wide range, the impact of great, can not be ignored.
Experts believe that microwave radiation can cause cell chromosomes to mutate and cause mitosis to become abnormal, so normal cells become cancerous cells, leading to cancer. High frequency electromagnetic radiation emitted by the frequent use of mobile phone, its frequency from 400 MHz to 1000, the intensity of electromagnetic radiation emitted per square metre in 1800 ~ 2000 mw. When using a cell phone, a relatively high frequency electromagnetic radiation is generated near the transmitting antenna of the cell phone. Mobile phones are closer to the head and cause electromagnetic radiation on the head. If the body has long suffered from the effects of high intensity electromagnetic radiation, can cause dizziness, insomnia, irritability and fatigue, memory loss and other symptoms of central nervous system, will cause the plant nerve function disorder, produce bradycardia, tachycardia cardiovascular system speed and fluctuation of blood pressure and other symptoms.
Nowadays, more than one million people use computers and computer networks every day, and the computer’s harm to the human body is often overlooked. According to foreign surveys, the long-term use of computer operators, 75% of people with vision loss, eye fatigue, dry eyes or tears, susceptible to fatigue, anorexia, memory loss, headache, brain swelling and other diseases. In particular, children’s obsession with computers, children’s emotional impatience, eccentric personality, selfish, affecting the normal development of children.
Also, during the SARS epidemic last year, people increased their awareness of disinfection, and some people used ultraviolet light to disinfect them. But UV rays can damage people’s eyes if used improperly. Experts say excessive UV radiation can cause burns to the skin and may cause skin cancer even after a long period of exposure.
At present, our life can not be separated from electronic products, in order to avoid its harm, we should grasp the scientific method, take certain protective measures to prevent the body from being hurt.
1., strengthen the propaganda and study of health knowledge, and enhance the awareness of protection.
2. operate in strict accordance with the instructions.
3. electrical appliances placed in place.
4., children, pregnant women and infirm people should strictly control the time and distance of watching TV and playing computer.
5., take part in more physical exercise, and enhance physical fitness.
6., diet, can eat more high protein and rich in vitamins food, such as: beans, spirulina food, reasonable food mix.
Brain scans can be the recipient of the brain waves, brain waves are received for receiving TV signals, can be isolated from the brain wave signal, visual thinking, auditory nerve nerve signal signal, and convert it into voice, text and images (like TV signal received by the antenna), no matter what, brain wave scanner receive the record, do not speak to what can be converted into sound, text and image. Text and images displayed on the screen (high resolution); visual signal is converted into an image size of God, become a victim to see what the camera body, objects, brain scans on the screen shows what objects.
Can send brain signals to harass the people and persecuted people, can launch various signal to joint pain, headache, stomach pain, pain in various parts of the body, lets the human libido may also let the human libido in human method can feel the state of available transmitting pain will be imposed on the victim and let the victim lose all social relations and the loss of jobs and the ability to work, the loss of property, can not sleep, health deterioration, loss of living conditions, the victim was torn, resulting in physical or mental illness.
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