Detecting method and device for mark in sheet surface
A detection device and detection method technology, which is applied in the direction of measuring devices, analysis materials, optical testing flaws/defects, etc., can solve the problems of low efficiency of manual inspection, strong subjectivity, and high inspection cost of line scan cameras
Inactive Publication Date: 2017-09-15
BENQ MATERIALS
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Problems solved by technology
[0004] In order to improve the above-mentioned problems of high cost of line scan camera inspection and low inspection efficiency and strong subjectivity of manual inspection, the present invention provides a method and device for detecting in-plane marks on sheet materials
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no. 2 approach
[0127] Please refer to Figure 12 , the second embodiment of the sheet in-plane mark detection method includes the following steps:
[0128] Step P1, continuously collecting images of the first region of the sheet 106 passing through the gap 103 to obtain a plurality of first collected images 201'; and continuously collecting images of the second region of the sheet 106 passing through the gap 103 to obtain a plurality of first 2. Capture images 301;
[0129] Step P2, stitching multiple first captured images 201' and multiple second captured images 301 to form a complete third stitched image 600; specifically, please refer to Figure 13 , the formation process of the third stitched image 600 includes:
[0130] Step P21, performing brightness detection on multiple first captured images 201' and multiple second captured images 301 respectively;
[0131] Step P22, judging whether the first captured image 201' is the first effective image 201a' and judging whether the second ca...
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The invention relates to a detecting method and device for a mark in a sheet surface. The device comprises a first conveying platform, a second conveying platform, a first image acquiring unit and a processing unit, wherein a gap is formed between the first conveying platform and the second conveying platform; the sheet is conveyed from the first conveying platform to the second conveying platform in the first direction; the sheet in the first direction has a first length, and the gap is provided with a first distance in the first direction, and the first length is beyond the first distance; the first image acquiring unit is arranged on the other side opposite to side provided with the gap; a plurality of first acquiring images can be obtained by continuously acquiring the images of the sheets at the gap; the processing unit is used for splicing the plurality of acquiring images to form a first splicing image and recognizing whether the mark is in the first splicing image. According to the detecting method and the device, a corresponding brightness sampling area is simply extracted; the brightness can be adjusted based on the brightness sampling area, so as to avoid abnormal light collection of surface CCD cameras caused by the warping of the side edge of the sheet. Therefore, the whole device is free from a sheet flatting mechanism, as a result, the cost can be decreased.
Description
technical field [0001] The invention relates to the field of sheet detection, in particular to a method and device for detecting in-plane marks on a sheet. Background technique [0002] In the production process of polarizers, due to the needs of automated production and cost reduction, polarizer manufacturers have introduced automatic optical defect (Automatic Optic Inspection) inspection mechanism to detect defects on the surface of polarizers, using automatic optical defect (Automatic Optic Inspection) equipment , inspect the production defects on the surface of the polarizer coil, and spray a special mark (hereinafter referred to as AOI Mark) on the defect position. In the process of making the polarizer coil into the finished sheet, the operator only needs to directly pick out the products with the AOI Mark, which frees the operator from the extremely complicated work of professional surface inspection. At present, the screening of products with AOI Mark is mainly done...
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IPC IPC(8): G01N21/95
CPCG01N21/95G01N2021/9511
Inventor 孙盛军
Owner BENQ MATERIALS