Surface defect detection system and detection method of online coil plate based on ccd line array camera
A detection system and line-scan camera technology, applied in the direction of optical testing flaws/defects, image data processing, instruments, etc., can solve problems such as different labels, no equivalence table equivalence set completion scheme, etc.
Active Publication Date: 2015-08-19
TONGJI UNIV +1
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[0020] The original sequential method does not give the specific operation of the equivalence table and the complete scheme of the equivalence set. In practice, if the original equivalence table obtained only by scanning the image is not processed, the same connected domain will appear in the marking result In the case of different labels
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[0157] like figure 2 and Figure 5 As shown, the detection system consists of a camera unit 1 , a light source 2 , a display 3 , an encoder 4 , an image processor 5 and a labeling machine 6 . Consists of six parts and the measured roll plate, the connection lines and arrows in the figure indicate the connection method and data transmission direction. The light source 2 irradiates the roll plate, the camera unit 1 takes pictures of the roll plate, the encoder 4 measures the roll speed and controls the exposure rate of the camera unit 1, the image data of the camera unit 1 is transmitted to the image processor 5, and finally the labeling machine 6 feeds the roll plate Tag. The camera unit 1 is a NED Sufi74 CCD line scan camera with a horizontal resolution of 7400, a width of only one line, and a line frequency of 12500. The light source 2 is an LED lighting lamp. The display 3 displays information such as a screenshot of the size and position of the marked defect. The enco...
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The present invention relates to a CCD linear array camera-based online rolled sheet material surface flaw detection system and a detection method thereof. The detection system is composed of a camera unit, a light source, a displayer, an encoder, an image processor and a labeling machine. The detection method comprises: performing shading operation for image data collected by the camera unit in the detection system, preliminarily marking grayscale image flaw after shading, merging adjacent flaws into one flaw and assigning to a same mark by using the concept of an equivalent table, and using IntelCPU+windows multicore multithreaded programming. The present invention is designed to achieve real-time and comprehensive feedback for detection results including number of flaws, sizes, coordinate positions, shapes, areas, and pixel mean values, and classify the flaws in this way. The functions of screenshot and classification are not possessed or partly not possessed by conventional products. The present invention is a self-improvement design marking method, and the method is programmed into software applied in industrial production.
Description
technical field [0001] The invention relates to industrial image processing and product surface flaw detection, in particular to a CCD line array camera-based surface flaw detection system and detection method for coiled plate surfaces. Background technique [0002] The use of roll sheet covers all aspects of our daily life, such as: synthetic leather, paper, rubber, film, glass plate, steel plate, non-ferrous metal plate, acrylic plate, aluminum foil and optical film applied to electronic LCD screens, etc. At present, in the coil plate production industry, in order to improve product quality, reduce surface defects of materials, and increase online detection means of defect detection equipment has become the main task of high-quality coil plate production. Traditional detection is done by "visual inspection" with human eyes. Due to the limitation of human physiological factors, it is impossible to detect defects completely accurately and objectively. [0003] Machine visio...
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IPC IPC(8): G01N21/88G06T7/00
Inventor 程晨周洪钧刘金生富山雅山
Owner TONGJI UNIV