In the past two years, high-end flatbed scanner manufacturers have shifted their research focus to relatively new and higher-level scanning technologies called xy scanning technology. We know that the quality of the scanned image of the scanner depends on its dynamic scanning range (shadow details), bits (hierarchy) and resolution. The xy scanning technology is a new technology developed to solve people's resolution requirements on the scanner.
-. C-550 Lanovia xy scanner C-550 The Lanovia scanner is an xy platform scanner produced by Fuji Electric. The scanner has a bit depth of 48bit and a scanning format of A3+. It adopts a 8000 pixel three-color linear CCD and an optical resolution of 5000 dpi. , Interpolation resolution up to 10000dpi, and with X, Y axis zoom scan function. The position of the scanning head is controlled by the triple screw, and the scanning head can move in the vertical and horizontal (X, Y axis) within the scanning area, so that each document can be scanned at the optimal resolution. The zoom technology uses the entire width of the CCD to focus on the document, so each document can be scanned at the optimal resolution regardless of its size or position on the document table. The scanner has a flat-pressure, fixed-origin manuscript table with a maximum scanning area of ​​470 × 350mm, and can accommodate up to 100 sheets of 35mm transmissive films at a time. The flat-press manuscript table with mobile scanning head design can handle oversized originals and irregular three-dimensional objects. At the same time, the auto-focus function enables the machine to scan mounted originals. It can also scan a variety of originals, including continuous Adjust prints, linework, and color separations. With a dedicated slide holder, users can set multiple originals in advance to speed up the time for rewriting. Each frame is accompanied by a number to facilitate the software to automatically identify when scanning. Its driver software is C-Scan. Its operation interface and color technology are similar to Fujifilm's other high-end roller scanners. It has a background job function and can scan the preview image on the screen while scanning the scanner. Other originals. This kind of image editing is parallel to scanning, and it can perform batch scanning and working methods that are shown in a simplified diagram, which can save time and increase production efficiency. C-Scan not only has rich color editing functions such as control level, color, sharpness (USM) and printing parameters, but also makes the best adjustments to images, as well as descreening and line drawing processing functions, while using C-Dot The software can also directly scan color separation pictures. Each original placed on any place on the platen can scan performance at the optimal resolution, and can handle oversized originals and irregular three-dimensional objects. What is the reason? Because xy scanning technology is used. Why does the xy scanning method have the performance that this non-xy scanner does not have? Below we illustrate the difference between non-xy scanners and xy scanners.
Second, the xy scanner's special xy scanning technology provides the ability to obtain the same resolution quality for images placed anywhere on the scan table. Its "flattening capability" (scanning the strips together) allows the flatbed scanner to be comparable to a roller scanner capable of high resolution scanning of too many documents. These capabilities of the platform scanner all result from the fact that its moving parts can move in both x (horizontal) and y (vertical) directions simultaneously. Non-xy platform scanners that can only move in the x direction do not have this capability.
Strictly speaking, this is the imaging sensor of the xy scanner that can move in the xy direction at the same time. In fact, with the deepening of research and the principle of relativity of motion in physics, the currently studied xy scanners employ different methods to complete the relative motion of the imaging sensor in the xy plane. To further illustrate the unique features of the xy scanner, here are some basics.
1. Sensor and picture resolution. The scanner consists of many important components, the most important being the imaging sensor and the associated optical system. Drum scanners typically use optical telecommunication boosters (PMTs) as imaging sensors, while platform scanners use charge-coupled device (CCD) technology. At present, the development of the scanner has been shifted to the CCD technology, so that currently manufactured platform scanners using the CCD as an imaging sensor have been applied to a drum scanner using a photomultiplier tube both in optical resolution and in hierarchical reproduction. It is very close.
2. Optical resolution. We know that the optical resolution is determined by the scanner sensor system. This is because the light of the original carrying the original transmitted from the continuous original, the line original, the reflective or the transmissive original is received by the imaging sensor of the scanner, and the light with the original information is converted into an electric signal by the sensor and then passed through the digital-to-analog converter. Converted to digital data bits, we call it an element or pixel of the image.
Therefore, whether it is a xy or xy scanner, the optical resolution of the scanner is basically determined by its optical system, which is determined by the discrete sampling of the imaging sensors of each scanner. The optical resolution can be defined by the following formula:
Number of CCD elements/scanning width [y direction] (in) = resolution of the optical 3. resolution of the incast. Interpolation resolution is the resolution of the scanner using an optical sensor and then it is mathematically interpolated by software interpolation. The interpolation software resamples the scanned image according to a mathematical formula, scans the image data points on average, and inserts new pixels between the original data. In fact, the interpolation data does not "true" increase the details of the image, but smoothes the details of the image, making the image appear to be more blurred than the image that was not interpolated. Interpolation increases the resolution and the poorer the quality of the image.
For non-xy scanners, resolution interpolation is required when the scanned image requires a higher resolution and the scanner's optical resolution capability is not achieved. For example, if the resolution of the scanner is 600 dpi, When setting the original size and requiring a 700 dpi scan, the software must be interpolated and additional pixels generated by the scanner.
Xy-Zoom scanners can change their optical resolution with the size of the original, so they need to be interpolated to change the resolution to accommodate large originals. The xy-scanner applies interpolated matching to be perpendicular to the CCD arrangement along the CCD arrangement direction. . For all types of scanners, the type of interpolation is customizable, however, whether or not the scanner needs interpolation depends on its scanning optical resolution. If the scanner can optically achieve the desired resolution, it does not have to be interpolated to increase the resolution, otherwise the scanner must be interpolated to the desired resolution. To better understand the difference between non-xy scanners and xy scanners, we need to consider how non-xy scanners collect image data. The first platform scanner has a lens in front of the CCD that covers the scanner's platform width. This technique allows this scanner to have only one optical resolution, and the optical system can only move in the X direction. The disadvantage of this type of scanner is that this technique has a fixed optical resolution that requires interpolation for higher resolution, and There is a lack of scanning quality at the edge of the scanning original table.
The second generation of flatbed scanners have multiple lenses covering different widths, ie lenses with a width corresponding to the full width of the scanner, 1/2 and 1/4, which give the scanner three different kinds of optics. Resolution, the optical system still can only move in the x direction. This technique solves the problem of optical resolution of small-scale originals, but for large-scale originals, wide-field, low-resolution lenses are still used to scan and place originals at the edge of the original table. The quality of scanned images is still a problem. That is, only high-resolution images can be obtained at the high-resolution lens scan range. We call this region the optimal scan region.
4.xy movement. Each scanner manufacturer has its own method to make the scanner have a xy motion scan method. Overall, this kind of exercise is currently accomplished by the following methods:
1 Move the platen in the x direction and move the sensor in the y direction; 2 Move the sensor in the x and y directions without moving the platen.
The xy scanner can scan the same image in different areas of the platen. This feature allows the xy scanner to scan small originals with high resolution.
5.z zoom. The focal length of the multi-lens optical system that is focused on the document table or the focal length of the zoom lens is changed so that the scanning area and the optical resolution can be changed at the same time. For small originals, the use of the zoom function of the lens in the xy scan and the ability to traverse the original platform by means of a CCD and a lens solve the scanning problem of the original at the edge of the original table. For large manuscripts, limited resolution can still be achieved as long as the lens is moved away from the width. The lens shift away reduces the optical resolution of the scanner (by enlarging the coverage width of the CCD element) and the angle of original change in the scan causes edge sharpening through the lens group.
6. Flatten images. Flattening is a truly unique feature of the xy platform scanner. Flattening helps the xy scanner scan the cropped picture area of ​​any size original placed anywhere on the scanner's original table at maximum resolution. Since the imaging sensor scans the imaged image area in the x and y directions, the sensor always scans the image data within the collection band in high resolution imaging. The software then merges the data strips without pixels to obtain a scanned image with the correct resolution.
Flattening allows some xy scanners to scan large artwork with high resolution, and art works below 2 x 2.5in generally do not scan with a higher resolution split scanner. Some xy scanners use a stitching function for each scan, while others selectively use a split scan. Only the xy scanner with the flattening function can perform the following tasks: 1 scan any size original document at the same optimal resolution at any position on the original table; 2 can determine the optical scan center at any position below the original table; 3 regardless of large originals Neither the edge area of ​​the image or the scanning image of the small document located on the edge of the document plateau will produce sharpness loss; 4 it can scan 70 sheets of 35mm film at a time.
7.3D scan. Some xy systems have a three-dimensional scanning function. This function is determined by whether or not the scanning manuscript table is moving. If the xy scanning is achieved by the movement of the original platen, such a scanner does not have a function of clearly scanning and imaging the three-dimensional object. Therefore, the document table of the xy scanner having a three-dimensional scanning function is fixed.
-. C-550 Lanovia xy scanner C-550 The Lanovia scanner is an xy platform scanner produced by Fuji Electric. The scanner has a bit depth of 48bit and a scanning format of A3+. It adopts a 8000 pixel three-color linear CCD and an optical resolution of 5000 dpi. , Interpolation resolution up to 10000dpi, and with X, Y axis zoom scan function. The position of the scanning head is controlled by the triple screw, and the scanning head can move in the vertical and horizontal (X, Y axis) within the scanning area, so that each document can be scanned at the optimal resolution. The zoom technology uses the entire width of the CCD to focus on the document, so each document can be scanned at the optimal resolution regardless of its size or position on the document table. The scanner has a flat-pressure, fixed-origin manuscript table with a maximum scanning area of ​​470 × 350mm, and can accommodate up to 100 sheets of 35mm transmissive films at a time. The flat-press manuscript table with mobile scanning head design can handle oversized originals and irregular three-dimensional objects. At the same time, the auto-focus function enables the machine to scan mounted originals. It can also scan a variety of originals, including continuous Adjust prints, linework, and color separations. With a dedicated slide holder, users can set multiple originals in advance to speed up the time for rewriting. Each frame is accompanied by a number to facilitate the software to automatically identify when scanning. Its driver software is C-Scan. Its operation interface and color technology are similar to Fujifilm's other high-end roller scanners. It has a background job function and can scan the preview image on the screen while scanning the scanner. Other originals. This kind of image editing is parallel to scanning, and it can perform batch scanning and working methods that are shown in a simplified diagram, which can save time and increase production efficiency. C-Scan not only has rich color editing functions such as control level, color, sharpness (USM) and printing parameters, but also makes the best adjustments to images, as well as descreening and line drawing processing functions, while using C-Dot The software can also directly scan color separation pictures. Each original placed on any place on the platen can scan performance at the optimal resolution, and can handle oversized originals and irregular three-dimensional objects. What is the reason? Because xy scanning technology is used. Why does the xy scanning method have the performance that this non-xy scanner does not have? Below we illustrate the difference between non-xy scanners and xy scanners.
Second, the xy scanner's special xy scanning technology provides the ability to obtain the same resolution quality for images placed anywhere on the scan table. Its "flattening capability" (scanning the strips together) allows the flatbed scanner to be comparable to a roller scanner capable of high resolution scanning of too many documents. These capabilities of the platform scanner all result from the fact that its moving parts can move in both x (horizontal) and y (vertical) directions simultaneously. Non-xy platform scanners that can only move in the x direction do not have this capability.
Strictly speaking, this is the imaging sensor of the xy scanner that can move in the xy direction at the same time. In fact, with the deepening of research and the principle of relativity of motion in physics, the currently studied xy scanners employ different methods to complete the relative motion of the imaging sensor in the xy plane. To further illustrate the unique features of the xy scanner, here are some basics.
1. Sensor and picture resolution. The scanner consists of many important components, the most important being the imaging sensor and the associated optical system. Drum scanners typically use optical telecommunication boosters (PMTs) as imaging sensors, while platform scanners use charge-coupled device (CCD) technology. At present, the development of the scanner has been shifted to the CCD technology, so that currently manufactured platform scanners using the CCD as an imaging sensor have been applied to a drum scanner using a photomultiplier tube both in optical resolution and in hierarchical reproduction. It is very close.
2. Optical resolution. We know that the optical resolution is determined by the scanner sensor system. This is because the light of the original carrying the original transmitted from the continuous original, the line original, the reflective or the transmissive original is received by the imaging sensor of the scanner, and the light with the original information is converted into an electric signal by the sensor and then passed through the digital-to-analog converter. Converted to digital data bits, we call it an element or pixel of the image.
Therefore, whether it is a xy or xy scanner, the optical resolution of the scanner is basically determined by its optical system, which is determined by the discrete sampling of the imaging sensors of each scanner. The optical resolution can be defined by the following formula:
Number of CCD elements/scanning width [y direction] (in) = resolution of the optical 3. resolution of the incast. Interpolation resolution is the resolution of the scanner using an optical sensor and then it is mathematically interpolated by software interpolation. The interpolation software resamples the scanned image according to a mathematical formula, scans the image data points on average, and inserts new pixels between the original data. In fact, the interpolation data does not "true" increase the details of the image, but smoothes the details of the image, making the image appear to be more blurred than the image that was not interpolated. Interpolation increases the resolution and the poorer the quality of the image.
For non-xy scanners, resolution interpolation is required when the scanned image requires a higher resolution and the scanner's optical resolution capability is not achieved. For example, if the resolution of the scanner is 600 dpi, When setting the original size and requiring a 700 dpi scan, the software must be interpolated and additional pixels generated by the scanner.
Xy-Zoom scanners can change their optical resolution with the size of the original, so they need to be interpolated to change the resolution to accommodate large originals. The xy-scanner applies interpolated matching to be perpendicular to the CCD arrangement along the CCD arrangement direction. . For all types of scanners, the type of interpolation is customizable, however, whether or not the scanner needs interpolation depends on its scanning optical resolution. If the scanner can optically achieve the desired resolution, it does not have to be interpolated to increase the resolution, otherwise the scanner must be interpolated to the desired resolution. To better understand the difference between non-xy scanners and xy scanners, we need to consider how non-xy scanners collect image data. The first platform scanner has a lens in front of the CCD that covers the scanner's platform width. This technique allows this scanner to have only one optical resolution, and the optical system can only move in the X direction. The disadvantage of this type of scanner is that this technique has a fixed optical resolution that requires interpolation for higher resolution, and There is a lack of scanning quality at the edge of the scanning original table.
The second generation of flatbed scanners have multiple lenses covering different widths, ie lenses with a width corresponding to the full width of the scanner, 1/2 and 1/4, which give the scanner three different kinds of optics. Resolution, the optical system still can only move in the x direction. This technique solves the problem of optical resolution of small-scale originals, but for large-scale originals, wide-field, low-resolution lenses are still used to scan and place originals at the edge of the original table. The quality of scanned images is still a problem. That is, only high-resolution images can be obtained at the high-resolution lens scan range. We call this region the optimal scan region.
4.xy movement. Each scanner manufacturer has its own method to make the scanner have a xy motion scan method. Overall, this kind of exercise is currently accomplished by the following methods:
1 Move the platen in the x direction and move the sensor in the y direction; 2 Move the sensor in the x and y directions without moving the platen.
The xy scanner can scan the same image in different areas of the platen. This feature allows the xy scanner to scan small originals with high resolution.
5.z zoom. The focal length of the multi-lens optical system that is focused on the document table or the focal length of the zoom lens is changed so that the scanning area and the optical resolution can be changed at the same time. For small originals, the use of the zoom function of the lens in the xy scan and the ability to traverse the original platform by means of a CCD and a lens solve the scanning problem of the original at the edge of the original table. For large manuscripts, limited resolution can still be achieved as long as the lens is moved away from the width. The lens shift away reduces the optical resolution of the scanner (by enlarging the coverage width of the CCD element) and the angle of original change in the scan causes edge sharpening through the lens group.
6. Flatten images. Flattening is a truly unique feature of the xy platform scanner. Flattening helps the xy scanner scan the cropped picture area of ​​any size original placed anywhere on the scanner's original table at maximum resolution. Since the imaging sensor scans the imaged image area in the x and y directions, the sensor always scans the image data within the collection band in high resolution imaging. The software then merges the data strips without pixels to obtain a scanned image with the correct resolution.
Flattening allows some xy scanners to scan large artwork with high resolution, and art works below 2 x 2.5in generally do not scan with a higher resolution split scanner. Some xy scanners use a stitching function for each scan, while others selectively use a split scan. Only the xy scanner with the flattening function can perform the following tasks: 1 scan any size original document at the same optimal resolution at any position on the original table; 2 can determine the optical scan center at any position below the original table; 3 regardless of large originals Neither the edge area of ​​the image or the scanning image of the small document located on the edge of the document plateau will produce sharpness loss; 4 it can scan 70 sheets of 35mm film at a time.
7.3D scan. Some xy systems have a three-dimensional scanning function. This function is determined by whether or not the scanning manuscript table is moving. If the xy scanning is achieved by the movement of the original platen, such a scanner does not have a function of clearly scanning and imaging the three-dimensional object. Therefore, the document table of the xy scanner having a three-dimensional scanning function is fixed.