Line scan camera and its precision compensation method, storage medium
A line scan camera and precision compensation technology, applied in the camera field, can solve problems affecting detection precision
Active Publication Date: 2021-07-30
SUZHOU VEGA TECH CO LTD
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Problems solved by technology
When this wide-format line scan camera is used in the field of visual accuracy inspection, such as PCB hole position accuracy inspection machine, its inspection accuracy needs to reach the level of ±5μm. Since the camera itself is spliced by multiple CIS photosensitive units, the photosensitive unit The alignment accuracy is 100μm, which will seriously affect the detection accuracy
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[0022] The actual arrangement of photosensitive units in a line scan camera (ie, a wide-format camera) is as follows figure 1 shown; the maximum offset error between the photosensitive units is as figure 2 As shown, the X direction is +75 μm, and the Y direction is ±25 μm. see figure 1 , figure 2 , due to the inconsistency caused by the production and assembly of the photosensitive unit or its own errors, it will eventually lead to imaging deformation, thereby affecting the detection accuracy. Moreover, because the length of the line scan camera is relatively long, it is difficult to manufacture a corresponding calibration board, and the accuracy cannot be guaranteed.
[0023] Based on the above reasons, the present invention proposes a line scan camera and its accuracy compensation method, storage medium, and electronic equipment, so as to realize the accuracy compensation of the line scan camera through the dot matrix calibration plate, thereby improving the detection a...
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The invention discloses a line array camera and its accuracy compensation method and storage medium. The line array camera includes N photosensitive units, and the N photosensitive units are divided into m compensation blocks, where N and m are both positive integers, and N>m , the method includes the following steps: using a line array camera to collect images of a dot matrix calibration plate to obtain a first calibration plate image corresponding to each compensation block and a second calibration plate image corresponding to each pair of adjacent two compensation blocks; according to the first The calibration plate image performs intra-block linear accuracy compensation on each photosensitive unit in the corresponding compensation block to obtain the first compensation result; performs intra-block relative accuracy compensation on the corresponding compensation block according to the first compensation result to obtain the second compensation result; according to the second The calibration plate image and the corresponding second compensation result perform m-1 inter-block precision compensation on the corresponding compensation block to obtain a third compensation result; perform precision compensation on the line-scan camera according to the third compensation result. Accordingly, the detection accuracy of the line camera can be improved.
Description
technical field [0001] The present invention relates to the technical field of cameras, in particular to a line scan camera, a method for compensating for accuracy thereof, and a storage medium. Background technique [0002] A CIS (Contact Image Sensor, Contact Image Sensor) is usually used in a scanner, which includes a plurality of photosensitive units closely arranged to collect light information reflected by a scanned object. Since the contact image sensor itself is cheap and does not need a lens group, a more compact visual system can be produced, and the cost is also lower. [0003] At present, wide-format contact image sensor line scan cameras are widely used in PCB (Printed Circuit Board, printed circuit board) hole inspection machines. When this wide-format line scan camera is used in the field of visual accuracy detection, such as a PCB hole position accuracy detector, its detection accuracy needs to reach the level of ±5μm. Since the camera itself is composed of ...
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IPC IPC(8): G01B11/00G06T7/80G06F17/16
CPCG01B11/005G06F17/16G06T7/80
Inventor 管凌乾常远
Owner SUZHOU VEGA TECH CO LTD