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Image reference-free quality evaluation method and system based on gradient profile

A technology of reference quality and evaluation method, applied in the field of image processing, can solve the problems of increasing the complexity of image quality evaluation, not applicable to the field of image quality evaluation, etc., and achieve the effect of good robustness

Active Publication Date: 2010-11-03
PEKING UNIV
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Problems solved by technology

[0006] However, if the above methods are applied to image quality evaluation, the inherent blur of the image caused by different reasons should be processed separately, which will greatly increase the complexity of image quality evaluation, so the above methods are obviously not suitable for the field of image quality evaluation

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  • Image reference-free quality evaluation method and system based on gradient profile
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  • Image reference-free quality evaluation method and system based on gradient profile

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Embodiment Construction

[0036] In order to make the above objects, features and advantages of the present invention more comprehensible, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] The basic idea of ​​the method proposed by the present invention is: through the analysis of the sharpness of the gradient profile of the strong edge in the image (video frame), and the analysis of the regional statistical characteristics associated with the gradient profile, the blurring effect and the ringing effect are obtained. To further obtain an image evaluation that conforms to human subjective feelings.

[0038] refer to figure 1 , figure 1 It is a flow chart of the steps of an embodiment of an image no-reference quality evaluation method based on a gradient profile according to the present invention, including:

[0039] Step 110 is used to detect the edge points of the input image, ...

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Abstract

The invention discloses image reference-free quality evaluation method and system based on a gradient profile. The image reference-free quality evaluation system comprises a gradient profile extraction device, a blurring effect evaluation device, a ringing effect evaluation device and an integrated evaluation device, wherein the gradient profile extraction device is used for detecting input image edge points and extracting the gradient profile according to the edge points; the blurring effect evaluation device is used for measuring the blurring effect of images according to the gradient profile; the ringing effect evaluation device is used for measuring the ringing effect of the images according to the gradient profile; and the integrated evaluation device is used for fusing the blurring effect measurement and the ringing effect measurement to acquire a quality evaluation reference value of input images. Based on the invention, the quality evaluation can be carried out on various types of natural images; and especially, the invention has favorable robustness for partially-blurred images due to the defocusing, the motion and other reasons.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a method and system for evaluating image quality without reference based on a gradient profile. Background technique [0002] Image quality assessment has important applications in the fields of image acquisition, compression, and enhancement. For the vast majority of applications, the ultimate observer of the image is a human being, so an objective evaluation method that conforms to the subjective feelings of a human observer (ie, perceptual image quality evaluation) has attracted extensive attention from industry and academia. The above objective evaluation of image quality can be divided into three types: Full Reference (FR, Full Reference), Partial Reference (RR, Reduced Reference) and No Reference (NR, No Reference). In quite a lot of applications (such as image enhancement), since the original image information cannot be obtained, the no-reference quality evaluation method ...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/12
Inventor 高文马思伟陈建华王诗淇赵德斌
Owner PEKING UNIV
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