Full-reference image quality evaluation method and system suitable for visual two-dimensional code
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An image quality evaluation and two-dimensional code technology, which is applied in image enhancement, image analysis, image data processing, etc., can solve problems such as inability to fit the characteristics of visual two-dimensional codes
Active Publication Date: 2020-08-28
SUN YAT SEN UNIV
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[0005]
In order to solve the problem that the existing full-reference image quality evaluation method is suitable for grayscale images and cannot fit the characteristics of visualized two-dimensional codes, the present invention provides a full-reference image quality evaluation method and system suitable for visualized two-dimensional codes
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Embodiment 1
[0111] A full-reference image quality assessment method suitable for visualizing two-dimensional codes, such as figure 1 shown, including the following steps:
[0112] S1. Obtain the visualized two-dimensional code image to be evaluated, and obtain the visualized two-dimensional code data area image according to the setting of the data area in the coding scheme, such as figure 2 shown;
[0113] S2. converting the obtained visualized two-dimensional code data area image into an RGB color model;
[0114] S3. Based on the RGB color model, obtain the pixel values of the three channels of R, G, and B of the visualized two-dimensional code data area image and the original visualized two-dimensional code image, and calculate the color similarity of the visualized two-dimensional code image ;details as follows:
[0115] Calculate the color similarity of the R channel:
[0116]
[0117] Calculate the color similarity of the G channel:
[0118]
[0119] Calculate the color s...
Embodiment 2
[0155] A full-reference image quality assessment system for visualizing QR codes, such as Figure 5 shown, including:
[0156] The image acquisition module 1 is used to obtain the visualized two-dimensional code image to be evaluated, and obtains the visualized two-dimensional code data area image according to the setting of the data area in the coding scheme;
[0157] The RGB color model building block 2 is used to convert the obtained visualized two-dimensional code data area image into an RGB color model;
[0158] The color similarity calculation module 3 is used to obtain the pixel values of the three channels of R, G, and B of the visualized two-dimensional code data area image and the original visualized two-dimensional code image based on the RGB color model, and calculate the visualized two-dimensional code The color similarity of the QR code image;
[0159] Contrast similarity calculation module 4 is used to divide the visualized two-dimensional code data area ima...
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Abstract
The invention discloses a full-reference image quality evaluation method and system suitable for a visual two-dimensional code. Based on inherent characteristics of the visual two-dimensional code, distortion and distortion in three aspects of color, contrast and gradient are selected as reference indexes of a visual two-dimensional code quality evaluation scheme. The color similarity, the contrast similarity and the gradient similarity of the visual two-dimensional code are calculated respectively, and a visual two-dimensional code image quality evaluation result is obtained through final weighted average. According to the evaluation method, the problem that an existing classic image quality evaluation method is not suitable for visualized two-dimensional codes is solved; the visual two-dimensional code image is a color image; the characteristics of image structure, contrast distortion and the like generated in the coding process are considered in the scheme, the visual two-dimensional code coded image quality is evaluated in a more targeted mode, optimization and improvement of the visual two-dimensional code scheme are better guided to better evaluate the characteristics of thevisual two-dimensional code scheme, and a better reference basis is provided for optimization and improvement of the coding scheme.
Description
technical field [0001] The invention relates to the technical field of image quality evaluation, in particular to a full-reference image quality evaluation method and system applicable to visualized two-dimensional codes. Background technique [0002] As the technology of two-dimensional codes becomes more and more mature and widely used, various improvements and optimizations based on two-dimensional codes have become more and more people's attention. Visual two-dimensional code, as an important branch of two-dimensional code expansion, is also more and more favored by researchers. In the visualization of two-dimensional codes, the image quality of the encoded image has important guiding significance for the encoding scheme. However, the current image quality evaluation schemes cannot guide the optimization of visualized QR codes well. Therefore, an image quality scheme that is more suitable for visualizing two-dimensional codes is particularly important. [0003] Image ...
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