Adaptive Image Scaling Method Based on Visual Saliency Detection in DCT Domain

An image scaling and self-adaptive technology, applied in image analysis, image data processing, graphics and image conversion, etc., can solve the problem that image scaling methods fail to reflect high-quality visual effects

Active Publication Date: 2017-08-22
GUANGXI UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of existing image scaling methods that fail to reflect high-quality visual effects, and provide an adaptive image scaling method based on visual saliency detection in the DCT domain to obtain higher-quality visual experience effects. thereby improving the performance of image scaling techniques

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  • Adaptive Image Scaling Method Based on Visual Saliency Detection in DCT Domain
  • Adaptive Image Scaling Method Based on Visual Saliency Detection in DCT Domain
  • Adaptive Image Scaling Method Based on Visual Saliency Detection in DCT Domain

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[0055] In order to make the purpose, technical method and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0056] In the following embodiments, only one image is taken as an example to describe the DCT domain-based adaptive image scaling method of the present invention. Such as figure 1 As shown, the method includes the following steps:

[0057] Step 100: read in the image in JPEG format.

[0058] Step 101: Partially decode the input JPEG compressed code stream into the DCT domain, divide the image into 8×8 DCT blocks, and extract the color, brightness and texture features of each DCT block respectively.

[0059] Step 102: According to the Euclidean distance between the DCT blocks, a Gaussian model based on the Euclidean distance between the blocks is established, and this Gaussian model is used as a weight coefficient of the difference between the block...

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Abstract

The invention discloses a self-adaption image scaling method for the visual-saliency detection based on DCT-domain. The method comprises the following steps: decoding part of a JPEG image to a DCT domain and obtaining a visual-saliency detecting diagram; performing threshold segmentation on the visual-saliency detecting diagram so as to obtain a spacial energy distributing diagram; extracting a visual salient region from the energy distributing diagram so as to obtain the size and the location of a protective frame and an energy distributing diagram containing the protective frame; calculating the number of clipping lines required to be deleted according to the size of the protective frame, and performing line clipping based on DCT blocks according to the number of the clipping lines required o be deleted and the protected energy diagram, finally, performing fine adjustment according to the resolution ratio of a user terminal, so as to obtain the output of an image satisfying the size requirement of the user terminal. Through the implementation of the method disclosed by the invention, visual salience content can be detected and protected, so that the quality of the image scaling technique is improved.

Description

technical field [0001] The invention relates to an image scaling method, in particular to an adaptive image scaling method based on visual saliency detection in DCT domain. Background technique [0002] Content-aware image scaling method - compared with traditional scaling methods such as nearest neighbor interpolation, bilinear interpolation and cropping, the line cropping method can change the aspect ratio of the image at will without distorting the content, which is very suitable for Mobile terminal devices are now displaying increasingly diverse sizes. The following briefly introduces several existing image scaling methods based on line cropping. [0003] The first type of method uses line cropping technology alone for image scaling. The scaling method is to find optimal cropping gaps on the image energy map, and then change the image size by inserting or removing cropping gaps. However, the disadvantage of this method is that only relying on deleting the cropping gap ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T3/40G06T7/136
CPCG06T3/4084
Inventor 唐振华罗雅丹黄孙国黄旭方覃团发
Owner GUANGXI UNIV
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