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Compression rate pre-allocation algorithm for JPEG 2000 multi-picture photo

A technology of image slicing and compression rate, which is applied in image coding, image data processing, complex mathematical operations, etc., can solve the problems of not meeting the real-time requirements of hardware and large amount of calculation, and achieve good real-time performance and effectiveness, and reduce MSE , the effect of visual effect enhancement

Inactive Publication Date: 2006-02-08
XI AN JIAOTONG UNIV
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Problems solved by technology

Therefore, the traditional calculation method of information content cannot meet the real-time requirements of hardware due to its large amount of calculation. Therefore, it is necessary to find a suitable statistical method of information content to evaluate the information content of images.

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  • Compression rate pre-allocation algorithm for JPEG 2000 multi-picture photo
  • Compression rate pre-allocation algorithm for JPEG 2000 multi-picture photo
  • Compression rate pre-allocation algorithm for JPEG 2000 multi-picture photo

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Embodiment Construction

[0019] The present invention is a method for automatically distributing the compression rate among the image slices according to the information content of the image slices. The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] 1. Evaluation method of information content

[0021] There are many evaluation methods for image information content, and Shannon information content is usually used to measure it. However, the amount of Shannon information needs to count the pixel values ​​of all points, and also perform logarithmic operation on the obtained statistical probability, which requires a large amount of calculation and poor real-time performance. The same mean square error (MSE) MSE is also a method to measure the information content of the image. It needs to scan the entire image twice, and also perform square operations, so the calculation amount is quite large, and more importantly, it cannot be realized....

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Abstract

The compression rate pre-distributing algorithm for JPEG2000 image sheet can distribute the user's set compression rate to various image sheets based on the information amounts of the image sheets, and this is superior to available average compression rate distributing algorithm, which produces poor chroma difference and unsmoothed edges. JPEG-LS and PNG predicating template and edge detecting operator are introduced for the calculation of information content in the images. Experiments show that using the compression rate pre-distributing algorithm can improve and strengthen the visual effect of the reconstructed image and reduce MSE obviously, especially to image with concentrated target image area. In addition, the present invention has high real-time performance and effectiveness and can meet the requirement of hardware.

Description

1. Technical field [0001] The invention belongs to the technical field of VLSI design. Specifically, it involves designing a new JPEG2000 compression rate pre-allocation method in JPEG2000 hardware implementation. 2. Background technology [0002] JPEG2000 static image compression standard has been a hot spot in engineering and academic circles since its release. All the parts about the compression rate control (rate control) in the JPEG2000 protocol are carried out for an image slice, which explains in detail how to allocate finite-length codewords in an image slice in order to minimize the distortion after image reconstruction. However, for a relatively large image, it is generally divided into multiple image slices for processing, and all forward component transformation, DC displacement, discrete wavelet transform, quantization, arithmetic coding, and layered truncation and packaging will only be performed in one Image slices are made internally. So how should the com...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T9/20G06F17/10
Inventor 郑南宁吴宗泽刘跃虎朱悦心
Owner XI AN JIAOTONG UNIV