Method for automatically detecting printing defects of remote controller panel based on SURF (Speed-Up Robust Feature) algorithm

A technology for automatic detection of printing defects, applied in the field of image processing, can solve problems such as large amount of calculation, difficulty in finding the best matching position, and difficulty in achieving real-time performance, so as to reduce false matching points, meet real-time requirements, and fast calculation speed Effect

Inactive Publication Date: 2015-04-29
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

The cross-correlation matching method is not easy to find the best matching position between the sample under test and the template map after changes such as rotation, and the amount of calculation is large, so it is difficult to meet the real-time requirements

Method used

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  • Method for automatically detecting printing defects of remote controller panel based on SURF (Speed-Up Robust Feature) algorithm
  • Method for automatically detecting printing defects of remote controller panel based on SURF (Speed-Up Robust Feature) algorithm
  • Method for automatically detecting printing defects of remote controller panel based on SURF (Speed-Up Robust Feature) algorithm

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Embodiment 1

[0045] In order to verify the measurement effect of the remote control defect automatic detection method based on the SURF algorithm provided by the present invention, the following experiment was carried out: considering that the original remote control picture is too large, a part of the remote control sample picture is selected as an example of the experimental result. After selecting multiple non-defective standard remote control samples, calculating the average gray value and cutting off the irregular edges, the standard template produced is as follows: image 3 shown. Figure 4 It is a sample picture of the remote control to be tested collected by the imaging system. The picture has been rotated and has 3 obvious content defects, namely the white area of ​​the round button in the upper right corner, the Korean letters next to the number 1 key and the number 8 key . The feature points of the two complete images calculated according to the SURF algorithm are 624 and 636, ...

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Abstract

The invention discloses a method for automatically detecting the printing defects of a remote controller panel based on an SURF (Speed-Up Robust Feature) algorithm. The method disclosed by the invention comprises the following steps: carrying out histogram equalization on a to-be-detected sample image by making a remote controller template image, respectively acquiring feature points of the template image and the to-be-detected image through the SURF algorithm, matching the feature points by utilizing a partitioned and accelerated nearest neighbour matching method, acquiring a homography matrix according to a matching result, carrying out affine transformation on the to-be-detected image to obtain a correction image by utilizing the homography matrix, processing difference images of the template image and the correction image superposed with a mask, carrying out binaryzation and morphological processing on a difference image result, judging whether a to-be-detected sample is qualified, if the to-be-detected sample has a defect, locating the position of the defect; if the to-be-detected sample does not have a detect, judging that the to-be-detected sample is qualified, and completing detection. The method disclosed by the invention is capable of effectively detecting defects in the to-be-detected sample and accurately locating the positions of the defects.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an automatic detection method for printing defects on a remote control panel based on a SURF algorithm. Background technique [0002] With the continuous development of China's manufacturing industry, more and more attention has been paid to the detection of product surface defects, and the remote control, which is closely related to our life, is one of the representatives. In the production process of the remote control, the characters on the panel and buttons are mainly printed by a screen printing machine, and problems such as blurred text, stains, missing prints, and misplacement will inevitably occur. Due to the large amount of detection, the traditional manual inspection , high labor cost, slow speed, high missed detection rate and other problems can no longer obtain satisfactory results, and the demand for automation of defect detection has arisen as the times req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/956
Inventor 王俭来疆亮鲁华祥边昳陈旭李威
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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