Image compression method combining super-resolution reconstruction

A technology of super-resolution reconstruction and image compression, applied in image communication, image enhancement, image data processing, etc. Prior knowledge and other issues to achieve the effect of improving the subjective visual quality and reducing the coding rate

Active Publication Date: 2014-02-26
SICHUAN UNIV
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Problems solved by technology

As far as the current super-resolution technology is concerned, the registration problem in video super-resolution and the lack of sufficient additional prior knowledge for super-resolution reconstruction of a single image have largely limited the ability of super-resolution reconstructed images. quality
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  • Image compression method combining super-resolution reconstruction
  • Image compression method combining super-resolution reconstruction
  • Image compression method combining super-resolution reconstruction

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[0042] The present invention will be further described in detail below in conjunction with the examples. It must be pointed out that the following examples are only used to further illustrate the present invention and cannot be interpreted as limiting the protection scope of the present invention. Content, making some non-essential improvements and adjustments to the present invention for specific implementation shall still belong to the protection scope of the present invention.

[0043] The encoded objects are standard still image encoded test images, and their names are: Figure 5-1 , Figure 5-2 , Figure 5-3 , Figure 5-4 , Figure 5-5 , the above test image resolution is 512×512. The objects of video encoding are standard test videos, and their names, resolutions and frame rates are: Figure 6-1 (352×288, 30 frames per second), Figure 6-2 (416×240, 60 frames per second), Figure 6-3 (832×480, 60 frames per second), Figure 6-4 (1280×720, 50 frames per second) an...

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Abstract

The invention discloses a video and image lossy compression method for image coding. The method combines traditional JPEG, JPEG2000, H.264 and HEVC-code standard algorithms with super-resolution image reconstruction and designs an image compression method combining the super-resolution reconstruction on the basis. Downsampling is carried out on an input video and image, wherein a downsampling method adopts a Bicubic algorithm and a downsampling multiple is 2. The number of dot arrays of a downsampling image is only 1/4 of that of an original image. The encoding rate of the downsampling image is far lower than that of an original input image so that the encoding rate is reduced. At the same time, on the basis that robustness differences of a residual image and a general image are analyzed, a negative-feedback step is introduced in the design so that part of high-frequency detail information lost in a super-resolution image reconstruction step is remedied and reconstructed video or image quality is improved. Compared with the JPEG and the H.264 standard algorithms, the compression method reduces the encoding rate greatly under a situation that image quality is the same.

Description

technical field [0001] The invention relates to image lossy compression technology in the field of image communication, in particular to a new encoding method combining image super-resolution with video and image compression. Background technique [0002] Image compression is the foundation of digital multimedia computing and communication technology, and the lossy compression method for video and image has been the focus of research for many years. With the rapid development of digital multimedia technology, high-definition video and images have been popularized in various fields and people's daily life. High-definition images occupy a large amount of data and the transmission bandwidth in transmission is limited. In the foreseeable future, the resolution and data rate of digital images will be further improved. The codec standards JPEG and JPEG2000 for still image compression are mainly applicable to the codec standards MPEG4 and H.264 for video image compression, which h...

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Application Information

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IPC IPC(8): H04N19/40H04N19/103G06T5/00
Inventor 何小海吴笛滕奇志黄建秋卿粼波吴晓红王正勇
Owner SICHUAN UNIV
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