Method for objectively evaluating image quality

An objective quality and evaluation method technology, applied in image communication, television, electrical components, etc., can solve problems such as insufficient integration of human visual characteristics, poor correlation, and decline

Inactive Publication Date: 2011-05-25
NINGBO UNIV
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Problems solved by technology

The change of image structure will lead to the decline of image quality, and one of the manifestations of image structure change is the change of gradient phase and gradient amplitude. The existing objective evaluation methods do not fully combine the visual characteristics of human eyes, or only consider the gradient amplitude. The influence of the change of the gradient phase on the image quality, or only considering the influence of the change of the gradient phase on the image quality, resulting in poor correlation between the final objective evaluation result and the subjective perception

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] An image objective quality evaluation method proposed by the present invention is mainly composed of the following parts: divide the image into regions, phase quantize and encode, calculate the Hamming distance of each region, determine the weight value, weight the Hamming distance of each region to obtain the objective Evaluation value, figure 1 The overall realization block diagram of the method of the present invention is provided, and it specifically comprises the following steps:

[0025] ①Denote the reference image with size W×H as {I o (i, j)|1≤i≤W, 1≤j≤H}, denoting a distorted image of size W×H as {I d (i, j)|1≤i≤W, 1≤j≤H}, where W represents the width of the reference image and the distorted image, H represents the height of the reference image and the distorted image, I o (i, j) represents the pixel value of the pixel point...

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Abstract

The invention discloses a method for objectively evaluating image quality. The method comprises the following steps of: dividing a reference image and a distorted image into an edge region, a texture region and a planar region in a combined way according to gradient amplitude information of each pixel point in the reference image and the distorted image; performing phase quantization coding on the reference image and the distorted image according to a gradient phase and a gradient amplitude of each pixel point in each region; calculating hamming distances for the phase quantization coding of different regions of the reference image and the distorted image; and giving different weights to the hamming distances of the different regions according to a human visual system so as to acquire a final object score of image quality evaluation. In the method, since the influence of variation of the distorted image relative to the gradient amplitude and the gradient phase of the reference image on the quality of the distorted image is comprehensively considered, an objective evaluation result obtained by the method has high consistency with a human eye subjective perception result; in addition, the method has low calculation complexity and high running speed.

Description

technical field [0001] The invention relates to an image quality evaluation method, in particular to an image objective quality evaluation method. Background technique [0002] Image quality evaluation is involved in the fields of image acquisition, compression, storage, transmission and reconstruction. However, real-time image processing technology needs a low-complexity, easy-to-hardware implementation of image quality evaluation method that can combine the characteristics of human eyes. Image quality evaluation methods can be divided into subjective evaluation methods and objective evaluation methods. The subjective evaluation method is a relatively reliable evaluation method, but the subjective evaluation method is time-consuming, laborious and cannot be operated in real time, so it is necessary to design a reasonable objective evaluation method. The objective evaluation method uses a mathematical model to evaluate image quality, which has the advantages of fast speed,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N17/00H04N17/02
Inventor 周武杰蒋刚毅郁梅彭宗举邵枫
Owner NINGBO UNIV
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