CN114677283A - Linear scanning device with adjustable resolution - Google Patents
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- CN114677283A CN114677283A CN202210411651.4A CN202210411651A CN114677283A CN 114677283 A CN114677283 A CN 114677283A CN 202210411651 A CN202210411651 A CN 202210411651A CN 114677283 A CN114677283 A CN 114677283A
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- 238000003384 imaging method Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims description 32
- 238000005286 illumination Methods 0.000 claims description 15
- 238000007781 pre-processing Methods 0.000 claims description 13
- 230000000694 effects Effects 0.000 description 12
- 230000000007 visual effect Effects 0.000 description 11
- 230000004927 fusion Effects 0.000 description 10
- 230000007547 defect Effects 0.000 description 9
- 238000010422 painting Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007499 fusion processing Methods 0.000 description 3
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- 238000009825 accumulation Methods 0.000 description 1
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- G06T3/40—Scaling of whole images or parts thereof, e.g. expanding or contracting
- G06T3/4038—Image mosaicing, e.g. composing plane images from plane sub-images
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
- G06T3/14—Transformations for image registration, e.g. adjusting or mapping for alignment of images
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Abstract
The invention relates to a linear scanning device with adjustable resolution, which comprises a scanning module provided with a plurality of scanning units, wherein the scanning units can locally image a scanning object to generate a local image with an overlapping area so that the scanning module can perform panoramic imaging on the scanning object, the plurality of scanning units are periodically and/or non-periodically arranged along a first direction to form the scanning module, so that the local image generated by the scanning module in the first direction and the adjacent local image have the overlapping area with different sizes, and the plurality of scanning units periodically and/or non-periodically acquire the local image along a second direction so that the plurality of local images acquired by the scanning module in the second direction at least have the overlapping area with different sizes.
Description
Technical Field
The invention relates to the technical field of image acquisition and image processing, in particular to a linear scanning device with adjustable resolution.
Background
Image stitching (image stitching) refers to a technique for stitching two or more images having overlapping portions into a panoramic image or a high-resolution image. The image splicing method comprises the following two steps: image alignment (image alignment) and image blending (blending).
An apparatus for imaging a local field of view, a multi-aperture imaging apparatus and a method of providing these apparatuses as proposed in the prior art patent document with publication number CN110754081A, wherein each optical channel comprises optics for projecting the local field of view of the total field of view onto the image sensor area of the image sensor. A first optical channel of the array is configured to image a first partial field of view of the total field of view. A second optical channel of the array is configured to image a second partial field of view of the total field of view. The apparatus includes a calculation unit configured to obtain image information of the first and second partial fields of view based on the imaged partial fields of view, obtain image information of the total field of view, and combine the image information of the partial fields of view with the image information of the total field of view to generate combined image information of the total field of view.
A method and apparatus for capturing high resolution photographs of objects, as proposed in publication No. CN1287588A, shifts the focal area of a linear image sensing array through the entire area containing the object to be photographed, which may be angular or linear, with appropriate scaling, to produce the final photograph, and by varying the depth of focus, the ridges of the object can be fully focused in one or more passes.
The scheme provided by the patent improves the resolution ratio of the image to a certain extent, but the registration error occurring in the actual splicing process is not fully considered, the splicing lines are approximately positioned on the same extension line, the splicing lines are easier to distinguish visually, and the splicing error is easily generated on the detail part caused by the fact that the parts with higher registration difficulty, such as characters, stripes and the like, are not adapted.
Furthermore, on the one hand, due to the differences in understanding to the person skilled in the art; on the other hand, since the inventor has studied a lot of documents and patents when making the present invention, but the space is not limited to the details and contents listed in the above, however, the present invention is by no means free of the features of the prior art, but the present invention has been provided with all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.
Disclosure of Invention
The invention discloses a linear scanning device with adjustable resolution, which comprises a scanning module provided with a plurality of scanning units, wherein the scanning units can locally image a scanning object to generate local images with overlapping regions so that the scanning module can perform panoramic imaging on the scanning object, the scanning units are periodically and/or non-periodically arranged along a first direction to form the scanning module so that the local images generated by the scanning module in the first direction and the adjacent local images thereof have the overlapping regions with different sizes, and the scanning units periodically and/or non-periodically acquire the local images along a second direction so that the local images acquired by the scanning module in the second direction at least have the overlapping regions with different sizes.
In most of the prior art scanning apparatuses, a plurality of partial images having the same size and the same size of an overlapping area are stitched to obtain a panoramic image with a higher resolution of a scanned object, and the partial images acquired by the scanning apparatuses for stitching the panoramic image are generally selected to have the same size (or have approximately the same size) and adjacent partial images acquired by the same scanning unit in a stepping direction (or the scanning units are arranged at equal intervals so that the sizes of overlapping portions of the adjacent partial images acquired by the adjacent scanning units are equal. When the local images acquired in the mode are spliced, the registration is carried out based on the overlapped part, the optimal splicing line is selected for splicing, then the natural transition is carried out on the adjacent local images near the splicing line by using a fusion algorithm (such as wavelet change, fuzzy reasoning and the like), the splicing difficulty is reduced to a certain extent by the characteristic of small change of the local image scale, the calculation amount of registration fusion in the image splicing process is simplified, the visual difference between the adjacent local images and the visual difference of the areas at two sides of the splicing seam are greatly reduced, but the acquired images have the same size and the sizes of the overlapped areas are approximately equal, so that the overlapped areas are positioned on the same extension line, the processing algorithms of the overlapped areas are consistent, therefore, the overlapped areas have similar picture characteristics and have a certain difference with the non-overlapped areas, and the overlapped areas are easier to be distinguished visually, therefore, splicing traces can be observed more easily in vision to influence the splicing effect, so that the overlapping regions (splicing seams) are dispersed by adopting a periodic or aperiodic acquisition method, the overlapping regions with similar picture characteristics processed based on the same algorithm are prevented from being positioned on the same extension line, the visual difference caused by splicing can be effectively weakened by dispersing the overlapping regions, and the picture imaging effect is improved.
In the process of registration and fusion, a panoramic image is spliced by a plurality of local images, although the existing registration technology can reduce the error generated by splicing the adjacent local images, but the error can not completely disappear, the errors are gradually accumulated when a plurality of images in the same extending direction are spliced, so that the error is generated as a whole, and the error is the result of small error accumulation, the non-periodic image acquisition method of the invention can disperse the whole error caused in the registration splicing process to the whole picture or the visually imperceptible area (such as the edge of the painting and calligraphy works and the blank part of the line spacing of the writing and calligraphy works) by dispersing the overlapped area, to disperse errors in stitching registration to a level that is imperceptible to an observer, to reduce visual discrepancies resulting from overall errors.
Further, in imaging a partially scanned object (such as a painting and calligraphy work), a plurality of scans are required to ensure imaging effect. Therefore, the processing module of the present invention is not limited to the above parameters for the result of the initial scan, and can also identify the contour lines and the defective portions of the scanned object. In the final scanning process, the overlapped area of the local image is matched with the contour line, the overlapped area is positioned on the contour line as far as possible, and the splicing line of the fused image is mainly concentrated on the contour line, so that the splicing line which is easy to distinguish visually and is caused by image splicing and the visual splicing trace which is caused by a plurality of overlapped areas are fused into the contour line of the picture.
When scanning is carried out, the small-scale distortion of the pre-scanning object or the defects of micro-scale bulges or depressions and the like generated when the pre-scanning object cannot be smoothly attached to a scanning platform cause the loss of the picture details of the area where the defects are positioned to influence the scanning effect, but a plurality of scanning subunits which are arranged non-periodically can carry out multiple times of acquisition on the detail features of the defect area under the condition of small angle deviation, and the details of the defect part in the overlapping area can be fused in the process of local image registration fusion, thereby improving the scanning quality.
The method is characterized in that a plurality of regions with different processing difficulties are inevitably present in a picture of an object to be scanned (for example, the image difference between different local images of regions such as the edge of a painting and calligraphy work and the blank part of the line spacing of the calligraphy and calligraphy work is small, the part rich in characters can affect the visual effect due to the small difference between the characters and the background where the characters are located, and the detail characteristic of the characters can influence the splicing dislocation problem which can be recognized by naked eyes, so that higher splicing precision is needed) The fuzzy characters and the like affect the visual effect.
Therefore, the aperiodic acquisition mode adopted by the invention can adopt different acquisition modes for the areas with different processing difficulties of the pre-scanned object, increase the acquisition density of parts with finer splicing requirements such as character parts and the like, the adjacent local images of the character part have larger overlapping areas, the registration precision of the adjacent local images is further improved, the acquisition density of the areas with higher similarity and lower processing difficulty is reduced, the size of the overlapping areas is reduced, the data acquisition amount and the processing calculation amount are further reduced, the preset processing effect of the areas with different processing difficulty can be realized based on the same data processing mode, factors influencing the picture effect are preprocessed in the acquisition process in a mode of carrying out difference acquisition on different areas in the acquisition process, so that the difficulty of subsequent registration fusion is reduced.
Preferably, the linear scanning device further comprises an illumination module and a data processing module, the illumination module comprises a plurality of light emitting units for providing illumination, and the light emitting units are arranged periodically or non-periodically along the first direction and/or the second direction.
Preferably, the data processing module is capable of adjusting the spacing between adjacent scanning units of the scanning module based on its pre-processing of the local image information acquired by the scanning units during the stepping of the scanning module in the second direction.
Preferably, the data processing module is capable of adjusting the scan parameters of the scanning module based on its pre-processing of the local image information such that the scanning module has partial images of overlapping regions of different sizes during stepping in the second direction.
Preferably, the scanning parameters include at least a stepping speed and a Z-axis height of the scanning unit.
Preferably, the preprocessing of the local image information by the data processing module includes at least calculating frequency domain information, luminance information, and color information of the local image.
Preferably, the data processing module is capable of setting the scan parameters based on information input by the operator.
Preferably, the scanning unit is capable of acquiring a partial image of the scanned object to form a digital array of partial images related to the scanned object, and several overlapping regions in the array of partial images can be arranged periodically and/or non-periodically.
Preferably, the data processing module is capable of processing the intersection region of the image with the first degree of distinction and the image with the second degree of distinction, so that the data processing module is capable of achieving the registration of the plurality of local images with the intersection region based on the image processing of the intersection region.
Drawings
FIG. 1 is a simplified overall structure diagram of the adjustable-resolution linear scanner of the present invention;
FIG. 2 is a schematic diagram of a local image acquisition mosaic structure in the prior art;
fig. 3 is a schematic diagram of a partial image acquisition mosaic structure of the linear scanning device with adjustable resolution according to the present invention.
List of reference numerals
1: a scanning module; 2: scanning an object; 3: a data processing module; 10: a scanning unit; 11: a first scanning unit; 12: a second scanning unit; 13: a third scanning unit; 21: a first direction; 22: a second direction; 40: a first partial image; 41: a second partial image; 42: a third partial image; 50: a fourth partial image; 60: a fifth partial image; 70: a third overlapping area; 71: a fourth overlapping area; 80: a first overlap region; 81: a second overlapping area; 101: an optimal viewing angle range; 200: an array of partial images.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The invention as shown in fig. 1 discloses a linear scanning device with adjustable resolution, which comprises a scanning module 1 configured with a plurality of scanning units 10, an illumination module (not shown in the figure) and a data processing module 3, wherein the scanning units 10 can perform local imaging on a scanning object 2 to generate a local image with an overlapping area so that the scanning module 1 performs panoramic imaging on the scanning object, the illumination module comprises a plurality of light-emitting units for providing illumination, the light-emitting units are arranged periodically or non-periodically along a first direction and/or a second direction, the plurality of scanning units 10 are arranged periodically and/or non-periodically along the first direction 21 to form the scanning module 1, so that the local image generated by the scanning module 1 in the first direction has the overlapping area with different sizes with the adjacent local image.
Optionally, the illumination module is disposed on the scanning module 1, and the light emitting units are distributed near the scanning unit 10, so that light of the light emitting units can be projected onto the scanning object 2, and the light of the light emitting units is reflected by the scanning object 2 and captured by the scanning unit 10.
As shown in fig. 2, during the imaging process of the scanning module 1, the magnification of the central region of the lens of the scanning unit 10 is not consistent with the magnification of the edge region, resulting in distortion of the imaging edge. When scanning is performed by using the scanning unit 10, the larger the field of view of the photographing is, the shorter the focal length of the lens used is, the more obvious the distortion degree is, so that there are portions such as distortion at the edges of the image, which are not convenient for stitching, and therefore, the scanning object 2 can be imaged according to the optimal view angle range 101 of the scanning module 10. In arranging the scanning unit 10 in the first direction 21, the optimal viewing angle range 101 of the scanning unit 10 is enabled to cover the scanning object 2 so as to remove the distorted edges of the image. When the multiple images acquired by the scanning module 1 are stitched, the overlapping portions between the multiple images are subjected to registration fusion to form a final panoramic image containing the multiple images, where the overlapping portions refer to overlapping portions of the multiple images formed in the optimal viewing angle range 101.
For the purpose of describing the image acquisition process for stitching, the relative movement direction of the scanning module 1 and the scanning object 2 is set to be the second direction 22, and the direction forming an angle with the second direction 22 is the first direction 21. Preferably, the second direction 22 is perpendicular to the first direction 21. Several scanning units 10 are capable of full view coverage of the scanned object 2 in a first direction 21 and full area image acquisition of the scanned object 2 in a second direction 22.
The image acquired by the first scanning unit 11 of the scanning module 1 shown in fig. 3 is a first partial image 40, the image acquired by the second scanning unit 12 is a second partial image 41, and the image acquired by the third scanning unit 13 is a third partial image 42. The overlapping area of the first partial image 40 and the second partial image 41 is a first overlapping area 80, the overlapping area of the second partial image 41 and the third partial image 42 is a second overlapping area 81, the overlapping area of the first partial image 40 and the fourth partial image 50 is a third overlapping area 70, and the overlapping area of the fourth partial image 50 and the fifth partial image 60 is a fourth overlapping area 71.
Taking the first scanning unit 11 as an example, during the linear stepping process along the second direction 22, the images acquired by the first scanning unit 11 are the first partial image 40, the fourth partial image 50 and the fifth partial image 60 in sequence, the overlapping area of the first partial image 40 and the fourth partial image 50 is the third overlapping area 70, and the overlapping area of the fourth partial image 50 and the fifth partial image 60 is the fourth overlapping area 71.
Example 1
As shown in fig. 3, in the prior art, a linear array is used to scan a scanning object (letters, drawings, etc. containing characters and images and using paper and other articles as carriers) in an equally spaced step manner, so that a plurality of acquired images for stitching have the same size and the size of an overlapping portion between adjacent images acquired by the same scanning unit in the step direction is equal to facilitate stitching of the images. The scanning units 10 are arranged at equal intervals and the light sources are arranged at equal intervals, so that the scanning object 2 is in the same or similar illumination condition, the panoramic images of the scanning object 2 are acquired at the same stepping speed, the acquired images have the same size and illumination condition, the overlapped areas have the same size, the parameter difference of the acquired images is reduced, splicing is facilitated, however, the overlapped areas of the spliced images are approximately on the same extension line, splicing marks which are easy to visually perceive appear are easy to appear, errors generated in splicing are easy to accumulate, and further, the edges of the post-spliced parts are easy to perceive, so that the overlapped areas are dispersed in a mode of changing the sizes of the overlapped areas of the scanning sub-units through a periodical or non-periodical acquisition mode.
Preferably, the scanning unit 10 is capable of acquiring a partial image of the scanned object 2 to form a partial image array 200 in digital form with respect to the scanned object 2, and several overlapping regions in the partial image array 200 can be arranged periodically and/or non-periodically.
Specifically, during the stepping of the scanning module 1 along the second direction 22, the data processing module 3 can adjust the spacing between adjacent scanning units 10 of the scanning module 1 based on its preprocessing of the local image information acquired by the scanning units 10, and the data processing module 3 can adjust the scanning parameters of the scanning module 1 based on its preprocessing of the local image information such that the scanning module 1 has local images of overlapping regions of different sizes during the stepping along the second direction 22.
Preferably, the plurality of scanning units 10 periodically and/or aperiodically acquire the partial images along the second direction such that the plurality of partial images acquired by the scanning module 1 along the second direction have at least overlapping regions of different sizes.
Preferably, the scanning parameters include at least the step speed and the Z-axis height of the scanning unit 10.
Preferably, the preprocessing of the local image information by the data processing module 3 comprises at least calculating frequency domain information, luminance information and color information of the local image.
Preferably, the data processing module 3 is able to set the scanning parameters based on information input by the operator.
Preferably, the linear scanning device further comprises an illumination module and a data processing module, the illumination module comprises a plurality of light emitting units for providing illumination, and the light emitting units are arranged periodically or non-periodically along the first direction and/or the second direction.
Preferably, the data processing module is capable of adjusting the spacing between adjacent scanning units of the scanning module based on its pre-processing of the local image information acquired by the scanning units during the stepping of the scanning module in the second direction.
Preferably, the data processing module 3 is capable of processing the intersection region of the image with the first degree of distinction and the image with the second degree of distinction, so that the data processing module 3 is capable of achieving the registration of the plurality of local images with the intersection region based on the image processing of the intersection region.
Example 2
According to a preferred embodiment, when scanning is performed, the scanning object 2 has small-scale distortion or the scanning object 2 cannot be smoothly attached to a scanning platform to generate defects such as micro-scale protrusions or depressions, so that the details of the area where the defects are located are lost to influence the scanning effect, while a plurality of scanning subunits which are arranged non-periodically can acquire the detail features of the defect area for a plurality of times under the condition of small angle deviation, and the height of the Z axis is adjusted to enable the detail parts of the defect parts in the overlapping area to be imaged in a multi-focus mode, so that fusion is realized in the process of local image registration fusion, and the scanning quality is improved.
Specifically, the part with the micro-scale distortion has certain fluctuation compared with other parts, under the scanning condition of fixed focal length, the part with the micro-scale distortion in the optimal imaging range of the focal length can realize clear imaging effect, the image has obvious edge characteristics in a space domain, is rich in details and has more high-frequency components in a frequency domain. However, the imaging of the part outside the optimal focal length imaging range is blurred, edge feature blurring appears in the spatial domain, and a large number of low-frequency components exist in the frequency domain. Based on the above features, the data processing module 3 determines the blurred region in the image preprocessing process and then adjusts the scanning unit to adjust the Z-axis height to perform multi-distance imaging at the micro-scale distorted portion, or adjusts the step distance, so that a plurality of images in the step direction can image the micro-scale distorted portion from different angles to adjust the distance from the micro-scale distorted portion, thereby realizing that the micro-scale distorted portion can perform multi-focus imaging and further improving the imaging effect of the micro-scale distorted portion.
According to a preferred embodiment, a plurality of regions with different processing difficulties are inevitably present in the picture of the object to be scanned (for example, the image difference between different local images of regions such as the edge of a painting and calligraphy work and the blank part of the line spacing of the calligraphy and calligraphy work is small, the part rich in the characters can affect the visual effect due to the small difference between the characters and the background where the characters are located, and the detail characteristics of the characters can influence the visual effect to cause the splicing dislocation problem which can be recognized by naked eyes, so that higher splicing precision is required) Blurring characters and the like affect visual effects.
Therefore, the aperiodic acquisition mode adopted by the invention can adopt different acquisition modes for the areas with different processing difficulties of the pre-scanned object, increase the acquisition density of parts with finer splicing requirements such as character parts and the like, the adjacent local images of the character part have larger overlapping areas, the registration precision of the adjacent local images is further improved, the acquisition density of the areas with higher similarity and lower processing difficulty is reduced, the size of the overlapping areas is reduced, the data acquisition amount and the processing calculation amount are further reduced, the preset processing effect of the areas with different processing difficulty can be realized based on the same data processing mode, factors influencing the picture effect are preprocessed in the acquisition process in a mode of carrying out difference acquisition on different areas in the acquisition process, so that the difficulty of subsequent registration fusion is reduced.
Specifically, for the region which is rich in characters or has a large change in content observed by naked eyes, the part with information is considered to have a large difference from the background where the part with information is located, the part with information is dispersed, and the information change such as frequency domain information and color information of the corresponding local image is more obvious, so that the complexity of the picture can be judged in the preprocessing process, the frequency of acquiring the local image is adjusted based on the input information or the preprocessing result of an operator, the acquisition density of the local image can be adaptively adjusted according to the difference degree of the picture in the local image, an appropriate stepping speed is selected based on the preprocessing result of the previous local image, a plurality of acquisition densities are set, the data processing amount is reduced, and the scanning speed is increased.
Example 3
In the process of imaging a part of a scanned object (such as a painting and calligraphy work), multiple scans are required in the prior art to ensure the imaging effect. Therefore, the result of the initial scan by the data processing module of the present invention is not limited to the content of the above-mentioned embodiment, and the data processing module 3 can also identify the contour line and the defect portion of the scan object (using the contour identification algorithm in the prior art). In the final scanning process, the overlapping area of the local image is matched with the contour line, the overlapping area is positioned on the contour line as much as possible, and the splicing lines of the fused image are mainly concentrated on the contour line, so that the splicing lines which are easy to distinguish visually and are caused by image splicing and the visual splicing traces caused by a plurality of overlapping areas are fused into the contour line of the picture.
Specifically, the data processing module 3 is used to perform contour recognition on the panoramic image formed by the primary scanning to extract the contour of the image thereof, and the method of the scatter stitching in embodiment 1 is combined to perform matching fusion to adjust the scanning parameters of the scanning module 1.
Furthermore, when the local images are spliced, the overlapping areas are mainly used for registration, then a splicing line is calculated in the range of the overlapping areas by using a splicing algorithm, and then the local images are fused based on the splicing line. Based on the above principle, in the process of scanning by the scanning module 1, the outline of the initially scanned panoramic image is extracted, so that the scanning parameters of the scanning module 1 can be adjusted based on the position of the contour line in the picture to enable the overlapped part of the local image collected by the scanning module 1 to be approximately located at the position of the contour line, and further in the process of secondary scanning after the initial scanning, the overlapped area of the scanned local image can cover part of the contour line and be distributed at the position of the contour line, so that the splicing trace can be located at the same position with the contour line of the initial scanning to the greatest extent in the process of registration and fusion processing to weaken the splicing trace.
Furthermore, most of the contour lines are irregular lines, in the process of extracting the contour lines, regions in a certain range where the contour lines are located are all selected, the selected shapes are similar to contour frames of overlapping regions, therefore, the extracted contour frames can be used as the overlapping regions to perform local image acquisition, in the later registration fusion process, due to the fact that the regions on the two sides of the contour lines have large differences, the algorithm (least square method and the like) of the splicing lines in the prior art tends to select the regions with small differences, the contours of the regions are generally distributed along the approximate trend of the contour lines, the trend of the splicing lines and the contour lines can be more consistent in the registration fusion process, the differences on the two sides of the splicing lines are small, and the splicing lines and the contour lines can be fused more naturally.
Throughout this document, the features referred to as "preferably" are only an optional feature and should not be understood as necessarily requiring that such applicant reserves the right to disclaim or delete the associated preferred feature at any time.
It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not intended to be limiting on the claims. The scope of the invention is defined by the claims and their equivalents.
Claims (10)
1. Linear scanning apparatus with adjustable resolution, comprising a scanning module (1) provided with a plurality of scanning units (10), the scanning units (10) being capable of locally imaging a scanned object (2) to generate local images with overlapping regions for panoramic imaging of the scanned object (2) by the scanning module (1),
the scanning module (1) is characterized in that a plurality of scanning units (10) are arranged periodically and/or non-periodically along a first direction (21) to form the scanning module (1), so that a partial image generated by the scanning module (1) in the first direction and a partial image adjacent to the partial image have overlapping areas with different sizes.
2. The tunable linear scanning device according to claim 1, further comprising an illumination module and a data processing module (3), wherein the illumination module comprises a plurality of light emitting units for providing illumination, and the light emitting units are arranged periodically or non-periodically along the first direction and/or the second direction.
3. Linear scanning device with adjustable resolution according to claim 2, characterized in that the data processing module (3) is capable of adjusting the spacing between adjacent scanning units (10) of the scanning module (1) based on its pre-processing of the local image information acquired by the scanning units (10) during the stepping of the scanning module (1) in the second direction (22).
4. Linear scanning apparatus with adjustable resolution, comprising a scanning module (1) provided with a plurality of scanning units (10), the scanning units (10) being capable of locally imaging a scanned object (2) to generate local images with overlapping regions for panoramic imaging of the scanned object by the scanning module (1),
characterized in that several of the scanning units (10) periodically and/or aperiodically acquire partial images along the second direction such that several partial images acquired by the scanning module (1) along the second direction have overlapping areas of different sizes.
5. Linear scanning device with adjustable resolution according to claim 4, characterized in that the data processing module (3) is capable of adjusting the scanning parameters of the scanning module (1) based on its pre-processing of the local image information such that the scanning module (1) has partial images of overlapping areas of different size during stepping in the second direction.
6. The adjustable resolution linear scanning device according to claim 5, wherein the scanning parameters include at least a stepping speed and a Z-axis height of the scanning unit (10).
7. The tunable linear scanning device according to claim 6, wherein the data processing module (3) pre-processes the local image information at least including calculating frequency domain information, luminance information and color information of the local image.
8. Linear scanning device with adjustable resolution according to claim 7, characterized in that the data processing module (3) is capable of setting scanning parameters based on information input by an operator.
9. Linear scanning device with adjustable resolution, comprising several scanning units (10), characterized in that the scanning units (10) are capable of acquiring partial images of a scanned object (2) to form an array (200) of partial images related to the scanned object (2) in digital form,
characterized in that several overlapping areas in the local image array (200) can be arranged periodically and/or non-periodically.
10. Resolution-adjustable linear scanning device according to claim 9, characterized in that the data processing module (3) is capable of processing the intersection region of the image with the first degree of distinction and the image with the second degree of distinction, so that the data processing module (3) is capable of achieving the registration of the plurality of local images with the intersection region based on the image processing of the intersection region.
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| CN116661717A (en) * | 2023-06-12 | 2023-08-29 | 深圳市威立印技术有限公司 | Image processing method and printer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116661717A (en) * | 2023-06-12 | 2023-08-29 | 深圳市威立印技术有限公司 | Image processing method and printer |
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