US 2019/0158849 A1 · METHOD AND APPARATUS FOR DIGITAL IMAGE QUALITY EVALUTATION

Abstract

This invention provides method and apparatus for quality evaluation of digital image to be used in the field of communication. The invention is used to tackle with the problem caused by the differences between the representation space of the digital image and the observation space. The digital image quality evaluation method calculates the objective quality of the digital image reflected in the observation space, while the calculation part is completed in the space to be evaluated. The digital image quality evaluation apparatus includes a distortion value generation module, a distortion value processing module, and a digital image quality evaluation module. The invention can provide a more accurate and fast objective quality calculation method in the observation space for the digital image in the space to be evaluated. The method of the invention is applied to digital image or digital sequence which can provide the accurate rate allocation scheme for the compression coding, and the coding performance can be greatly improved in the coding tool of digital image or digital video.

Claims18

Dependent claims

A digital image quality evaluation method for measuring the quality of a digital image to be evaluated in observation space, the method comprising:

summing the absolute value of the pixel values of the respective pixel group of the digital images in the space to be evaluated and the digital images in the reference space pixel by pixel to obtain the distortion values;
processing the distortion values of the digital images in the space to be evaluated according to the distribution of pixel groups in observation space;
measuring the quality of the digital images in the space to be evaluated by using the distortion value of the pixel groups of the entire digital image to be evaluated after the processing.

A digital image quality evaluation apparatus comprising:

a distortion generation module to sum the absolute value of the pixel values of each pixel group of the digital image in the space to be evaluated and the digital image in the reference space pixel by pixel to obtain the distortion value;
the input is the reference spatial digital image and the space to be evaluated and the output is distortion corresponding to the pixel group in the space to be evaluated;
a weighted distortion processing module to process the distortion value according to the distribution of the pixel group of the digital image in the space to be evaluated on the observation space, the input of which is the space to be evaluated and the output is the corresponding weights of the pixel group in the space to be evaluated;
a quality evaluation module that uses the processed distortion corresponding to the pixel group of the digital image of the entire image to be evaluated and the corresponding weights of the digital image to evaluate the quality of the digital image to be evaluated;
the input is the corresponding weights of the pixel group and the distortion value corresponding to the pixel group in the space to be evaluated, and the output is the quality of the digital image in the observation space.

2 more elements

A digital image quality evaluation method for measuring the quality of a digital image to be evaluated in observation space of a digital image to be evaluated, the method comprising:

obtaining the distortion values of each pixel group in the digital image by using the pixel values of the respective pixel groups of the digital images in the space to be evaluated and reference space;
processing the distortion values of the pixel groups of the digital images in the space to be evaluated according to the distribution in observation space;
measuring the quality of the digital images in the space to be evaluated by using the distortion value of the pixel group of the entire digital image to be evaluated after the processing.

A digital image quality evaluation apparatus comprising:

a distortion generation module to obtain the distortion value of the pixel values of each pixel group in the digital image to be evaluated pixel by pixel with the corresponding pixel values of the digital image in the reference space;
the input is the digital images in reference space and the space to be evaluated and the output is distortion values for the pixel group in the space to be evaluated;
a weighted distortion processing module to process the distortion value of the pixel group of the digital image in the space to be evaluated according to the distribution in the observation space, the input of which are the distribution of pixel group in the digital image to be evaluated and the observation space, and the output is the corresponding weights of the pixel group in the space to be evaluated;
a quality evaluation module that uses the processed distortion corresponding to the pixel group of the digital image of the entire image to be evaluated and the corresponding weights of the digital image are utilized to measure the quality of the digital image to be evaluated;
the input is the corresponding weights of the pixel group and the distortion values corresponding to the pixel group in the space to be evaluated, and the output is the quality of the digital image in the observation space.

2 more elements

Dependencies are inferred from the claim text.

Method and apparatus for digital image quality evalutation

Life of this patent

Method and apparatus for digital image quality evalutation

Life of this patent

Abstract

Claims18