Block plane fitting-based image binaryzation method and device

An image binarization and plane fitting technology, which is applied in the field of image processing, can solve problems such as large seam position errors, unimprovable binarization effects, and low binarization efficiency, achieving good robustness and reducing The time of offline calculation, the effect of both accuracy and efficiency

Inactive Publication Date: 2016-05-25
ZHEJIANG UNIVIEW TECH
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Problems solved by technology

The problem with this local binarization method is that if the block is small, the threshold value between two adjacent blocks may vary greatly, resulting in a large error in the seam position, making the binarization effect impossible

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  • Block plane fitting-based image binaryzation method and device
  • Block plane fitting-based image binaryzation method and device
  • Block plane fitting-based image binaryzation method and device

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[0053] In order to make the present invention clearer, a detailed explanation is now given in conjunction with the drawings and embodiments.

[0054] The method of an embodiment of the present invention is performed by an image binarization device. The image binarization device includes: a block threshold acquisition unit, a relational expression acquisition unit, an image binarization unit, and a fitting matrix calculation unit. Reference to the overall flow chart of the method figure 1 , Including the following steps:

[0055] Step 1. The block threshold acquisition unit divides the input image src(i, j) into multiple blocks on average, and calculates the binarization threshold of each block.

[0056] Among them, the number of blocks (that is, the division method) can be selected by the user according to actual conditions and needs, for example, it can be 2*2, 3*3, 2*3, 3*4, etc., and the number of divided rows is The number of columns can be different, and the size of each block ...

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Abstract

The invention discloses a block plane fitting-based image binaryzation method, comprising: dividing an image into many blocks; calculating the binaryzation threshold of each block; obtaining a relation expression about the binaryzation threshold of the whole image and the location of each pixel point in the image by fitting the binaryzation threshold of each block; and conducting image binaryzation by using the relation expression. The invention also discloses a device corresponding to the method. The invention has the prominent advantages that both local and global binaryzation information is considered, good robustness is achieved both for images with uniform illumination and images with non-uniform illumination, the threshold can be accurately obtained even when there are few blocks, and accuracy and efficiency are balanced.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a fast binarization method and device based on block plane fitting. Background technique [0002] The binarization method is the most common and most frequently used basic method of image processing. Many upper-level algorithms rely on the effect of binarization, such as target detection, target recognition, etc. Taking license plate recognition as an example, it is necessary to binarize the image when performing license plate detection, and to segment the license plate characters when it needs to binarize the license plate, and to do character binarization when recognizing characters. [0003] The most commonly used binarization method in the prior art is OTSU (that is, the Otsu method or the maximum inter-class variance method) binarization, which uses a threshold to divide the original image into two images, the foreground and the background. When the optimal threshold is taken...

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Application Information

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IPC IPC(8): G06T7/00
CPCG06T2207/20012G06T2207/20021G06T7/11G06T7/136G06T2207/10152
Inventor 王耀农
Owner ZHEJIANG UNIVIEW TECH
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