Unlock instant, AI-driven research and patent intelligence for your innovation.

Image compression method based on all phase discrete sine double orthogonal transformation and system

A discrete sine, image compression technology, applied in the field of image processing, can solve problems such as poor real-time performance, low efficiency, and large time consumption, and achieve the effect of saving memory, simplifying calculation, and improving compression performance

Active Publication Date: 2016-08-10
SHANDONG UNIV
View PDF3 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the original bitmap with high image pixels, due to the increase in the amount of data, if the traditional CPU serial structure is used to process it, it will consume a lot of time, the efficiency is low, and the real-time performance is not strong.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Image compression method based on all phase discrete sine double orthogonal transformation and system
  • Image compression method based on all phase discrete sine double orthogonal transformation and system
  • Image compression method based on all phase discrete sine double orthogonal transformation and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Such as image 3 As shown, in the present invention, the necessary technical features of the prior art are distinguished: the all-phase column rate filter is used for discrete sine transform, and a new type of transform—all-phase discrete sine biorthogonal transform is obtained.

[0087] The present invention adopts the transformation matrix of the VII type size used in the H.265 standard to be N×N two-dimensional discrete sine transform (DiscreteSine Transform, DST):

[0088] S ( i , j ) = 2 2 N + 1 s i n ( 2 i + 1 ) ( j + 1 ) π ...

Embodiment 2

[0107] In the present invention, the necessary technical features different from the prior art are: a new type of transformation is proposed, that is, full-phase discrete sine biorthogonal transformation, and it is used to replace the discrete cosine transformation in the JPEG standard, and a unified quantization step is used Long and uniform quantization replaces the complex quantization table in the original JPEG standard and is applied to image compression. The present invention can be realized based on software. Such as figure 1 As shown, the original image is input, the image is divided into 8×8 image blocks, and all-phase discrete sine biorthogonal transformation is performed on the blocks, and the corresponding quantization step size is formulated according to different bit rate requirements, and the transformation coefficients are uniform Quantization, followed by predictive encoding of the DC coefficient (DC), Zig-zag scanning and run-length encoding of the AC coeffi...

Embodiment 3

[0119] The core codec system of the JPEG image compression standard based on all-phase discrete sine biorthogonal transform mainly includes 8 modules. -zag scan followed by Huffman encoding. At the decoding end, Huffman decoding is performed first, then Zig-zag inverse scanning is performed, followed by inverse quantization, and finally inverse APDSBT is performed.

[0120] Based on all-phase column-rate filtering and discrete sine transform, an all-phase discrete sine biorthogonal transform is proposed to improve the encoding performance of JPEG, and uniform quantization is used in quantization, which simplifies the quantization process.

[0121] Aiming at the low efficiency of using traditional processors to encode and decode images with JPEG, a parallel APDSBT-JPEG image encoding and decoding system using graphics processors is proposed.

[0122] CUDA is a general-purpose parallel computing architecture launched by Nvidia for graphics processors in 2007. CUDA uses a C-like...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an image compression method based on all phase discrete sine double orthogonal transformation and a system. The method comprises the steps of class JPEG compression encoding of an image on an encoding end and decompression on a receiving end. When class JPEG compression encoding is carried out on the image on the encoding end, an input source image is divided into blocks; all phase discrete sine double orthogonal transformation is carried out on each image block; uniform quantization is carried out on a transformed coefficient; Zigzag scanning is carried out on the quantitated coefficient; and Huffman encoding is carried out on the coefficient after scanning rearrangement to acquire an output image. Correspondingly, when the image is decompressed on the receiving end, steps inverse to the steps of compression encoding of the image on the encoding end are carried out to acquire a reconstructed image. When an all phase discrete sine double orthogonal transformation algorithm is used to carry out class JPEG encoding, the compression performance of the image is effectively improved, and a block effect in image reconstruction under low bit rate is reduced.

Description

technical field [0001] The invention relates to the field of image processing, in particular to an image compression method and system based on all-phase discrete sine biorthogonal transformation. Background technique [0002] Image and video compression technology is the core of multimedia processing. With the rise of network streaming media and multimedia wireless sensor networks, people have higher and higher requirements for image and video clarity. However, due to the limitation of network bandwidth, people's requirements for data compression performance are getting higher and higher. Therefore, aiming at image and video data compression, relevant image and video coding technologies are proposed, and relevant standards are formulated. Among these video and image coding standards, one of the cores is the discrete cosine transform. Since the coefficient matrix of the image after the discrete cosine transform is sparse, it is very suitable for data compression. [0003]...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/126H04N19/176H04N19/60H04N19/436H04N19/426
CPCH04N19/126H04N19/176H04N19/426H04N19/436H04N19/60
Inventor 周晓单荣杨王成优蒋保臣
Owner SHANDONG UNIV