Calibration-free flattening method for scanned images
A technology of scanning images and scanners, which is applied in the field of non-calibration flattening of scanned images, which can solve problems such as large amount of calculation, influence of OCR text recognition, and influence on reading quality, so as to eliminate errors, reduce extra work, and have a wide range of applications Effect
Active Publication Date: 2019-05-03
DALIAN CHENGZHE TECH
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Problems solved by technology
[0003] However, when this type of image acquisition scanner scans objects with a certain thickness, such as dictionaries and textbooks with a large thickness, the scanned image of the pages in the middle of the book will produce a huge curvature, which seriously affects the reading quality. And the bending will also have a serious impact on the subsequent OCR text recognition
Technical solutions that can solve the above-mentioned technical problems to a certain extent are also disclosed in existing patents, but the algorithm principle is complex, the amount of calculation is large, and a specific dual-camera application scenario is required
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[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the drawings in the embodiments of the present invention:
[0035] Such as figure 1 Shown:
[0036] The optical axis of the lens is perpendicular to the horizontal bottom surface, and the two laser emitting sources are located on both sides of the lens with the same distance from the lens, emitting two parallel surface lasers perpendicular to the horizontal bottom surface. Books can be placed at any angle within the horizontal plane.
[0037] During the camera imaging process, four coordinate systems are involved. Their definitions and conversion relations are as follows:
[0038] World coordinate system: a three-dimensional European coordinate system with any point in the physical world as the coordinate origin and any...
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The present invention proposes a new flattening algorithm for the problem of automatic flattening of book images. Combined with two parallel lasers emitted vertically downward, the algorithm can automatically flatten the book image. Combining two algorithms based on book content flattening and laser line flattening, a calibration-free book flattening algorithm based on laser line is proposed. Compared with the existing algorithm, the advantage of the present invention is that the laser line does not need to be calibrated, which reduces the extra work caused by the calibration link and eliminates the errors introduced by the calibration. Compared with the flattening algorithm based on book content, the algorithm of the present invention does not depend on the content of the book page, so it has a wider application range. This algorithm does not need to limit the angle at which books are placed. Books can be placed at any angle within the shooting range that ensures that the laser line can hit the book page.
Description
technical field [0001] The present invention relates to a calibration-free flattening method for scanned images, and relates to patent classification H Electrics H04 Electric Communication Technology H04N Image Communication, such as scanning, transmission or reproduction of TV H04N1 / 00 documents or similar, such as fax transmission; Parts H04N1 / 387 carry out grouping, displacement or other corrections on the original. Background technique [0002] With the development of video capture and processing technology, scanners have been upgraded from traditional photosensitive scanners to a new generation of image capture scanners mainly based on video image capture. This new type of scanner captures photos of book pages through a camera located above the scanned object Scanning can be completed, eliminating the heavy workload caused by the traditional scanning method of manually pressing the printed matter to be scanned on the scanning surface, and has the great advantage of fast...
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IPC IPC(8): H04N1/387G06T3/00G06T3/60
CPCH04N1/387H04N1/3877H04N1/3878G06T3/608G06T3/18G06T3/04
Inventor 周康王丽李灏为
Owner DALIAN CHENGZHE TECH