Two-dimensional code extraction method and system under uneven illumination
A technology of uneven illumination and extraction method, which is applied in the field of two-dimensional code extraction method and system, and can solve problems such as inaccurate recognition and recognition speed
Inactive Publication Date: 2018-07-31
GUANGZHOU SYSUR MICROELECTRONICS +1
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[0004] However, the above-mentioned two-dimensional code extraction method has problems such as inaccurate recognition and slow recognition speed in the extraction of two-dimensional codes under the condition of uneven illumination.
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[0070] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0071] figure 1 It is a schematic flow chart of the two-dimensional code extraction method under uneven illumination in the embodiment of the present invention, such as figure 1 As shown, the two-dimensional code extraction method includes:
[0072] S11: Binarize the two-dimensional code image by using a local threshold method to obtain a binarized two-dimensional code image;
[0073] The specific steps of performing binary processing on the two-dimensional code ...
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The invention discloses a two-dimensional code extraction method and system under uneven illumination, wherein the two-dimensional code extraction method comprises: binarizing a two-dimensional code image by using a local threshold method to obtain a binarized two-dimensional code image; performing edge extraction on the binarized two-dimensional code image by using a sobel operator so as to obtain a two-dimensional code image subjected to the edge extraction; performing morphological processing on the two-dimensional code image subjected to the edge extraction, to obtain a morphologically processed two-dimensional code image; establishing a lookup table according to the morphologically processed two-dimensional code image and performing two-dimensional code extraction processing to obtaina two-dimensional code region. In the embodiment of the present invention, the two-dimensional code extraction scheme can quickly and accurately extract the two-dimensional code image required by theuser under the condition of uneven illumination, and can effectively remove the small noise points in original two-dimensional code image and large-area connected noise connected to the boundary.
Description
technical field [0001] The invention relates to the technical field of image processing, in particular to a method and system for extracting two-dimensional codes under uneven illumination. Background technique [0002] QR codes can be seen everywhere in real life, and they can store a wealth of information. But in many cases, due to various reasons, such as uneven lighting, insufficient light, or some stains and damages on the two-dimensional code image itself, it will make it difficult to extract and recognize the two-dimensional code image. Therefore, it is necessary to preprocess the collected images before decoding, to filter out some unnecessary information, eliminate the influence of noise in the image, restore damaged information, etc., and extract the required clear and complete two-dimensional code image. [0003] The existing two-dimensional code processing algorithms include Hough transform positioning algorithm, bilinear interpolation method, control point tran...
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Login to View More IPC IPC(8): G06K7/14G06T7/155
CPCG06K7/146G06T7/155
Inventor 胡建国林格陈湘萍李仕仁李启文
Owner GUANGZHOU SYSUR MICROELECTRONICS