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JPEG image and wavelet compression image conversion method and system

A technology for image compression and image conversion, which is applied in the field of image processing, can solve the problems of slow conversion speed and high conversion time, and achieve the effect of improving efficiency and reducing time-consuming

Inactive Publication Date: 2014-01-15
GUANGDONG VTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can obtain a better image conversion effect, but because it is all encoded, its conversion speed is slow, and the conversion time required for tens of thousands of images is very high

Method used

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  • JPEG image and wavelet compression image conversion method and system
  • JPEG image and wavelet compression image conversion method and system
  • JPEG image and wavelet compression image conversion method and system

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Experimental program
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Embodiment 1

[0039] like figure 1 As shown, it is a schematic flow chart of a method for converting a JPEG image of the present invention into a wavelet compressed image in an embodiment, including the following steps:

[0040] S11. Obtain a DCT coefficient matrix after performing entropy decoding and inverse quantization on the input JPEG image;

[0041] For the fast conversion from JPEG image to wavelet compressed image, first entropy decoding and inverse quantization are performed on the JPEG code stream to obtain the coefficients in the DCT (DCT for Discrete Cosine Transform) domain, that is, the DCT coefficient matrix.

[0042] S12. Divide the DCT coefficient matrix into multiple 8×8 matrices to obtain multiple DCT coefficient blocks;

[0043] In the still image coding standard JPEG, the discrete cosine transform is used to transform each row of each 8×8 block in the image, and then transform each column to obtain a DCT composed of multiple 8×8 transform coefficient matrices. The co...

Embodiment 2

[0076] The method for transforming wavelet compressed images into JPEG images is the inverse process of the above-mentioned embodiment one, such as Figure 5 described, including the following steps:

[0077] S51. Perform wavelet decoding on the input wavelet compressed image to obtain a wavelet coefficient matrix;

[0078] For the rapid conversion from wavelet compressed image to JPEG image, firstly, wavelet decoding is performed on the wavelet code stream to obtain the wavelet coefficient matrix;

[0079] S52. Decompose the wavelet coefficient matrix to obtain low frequency subbands and high frequency subbands;

[0080] In the wavelet coefficient matrix, from the perspective of energy, the energy of the image is concentrated in the relatively low-frequency sub-band, that is, the above-mentioned low-frequency sub-band, which records most of the information of the image; while the energy concentrated in the high-frequency sub-band is low, generally It is to record informatio...

Embodiment 3

[0099] Such as Figure 6 As shown, the present invention provides a kind of system that JPEG image is converted into wavelet compressed image, comprises:

[0100] DCT coefficient matrix module 61, carries out entropy decoding and inverse quantization to the input JPEG image, obtains DCT coefficient matrix;

[0101] A segmentation module 62, configured to divide the DCT coefficient matrix into multiple 8×8 matrices to obtain multiple DCT coefficient blocks;

[0102] An extraction module 63, configured to extract DC coefficients and AC coefficients in each DCT coefficient block;

[0103] The first forming module 64 is configured to use all DC coefficients as low-frequency subbands and all AC coefficients as high-frequency subbands, and form a wavelet coefficient matrix according to the low-frequency subbands and high-frequency subbands;

[0104] The wavelet image module 65 is configured to perform wavelet encoding according to the wavelet coefficient matrix to obtain a wavelet...

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Abstract

The invention relates to a method which is used for converting a JPEG image into a wavelet compression image. The method comprises the steps that entropy decoding and inverse quantization are carried out on the input JPEG image to acquire a DCT coefficient matrix; the DCT coefficient matrix is split into a number of 8*8 matrixes, so as to acquire a number of DCT coefficient blocks; direct current and alternating current coefficients are extracted from each DCT coefficient block; all direct current coefficients are used as a low frequency subband, and all alternating current coefficients are used as a high frequency subband; a wavelet coefficient matrix is formed according to the low frequency subband and the high frequency subband; and wavelet coding is carried out based on the wavelet coefficient matrix, so as to acquire the wavelet compression image. The invention further provides a corresponding JPEG image and wavelet compression image conversion system, and corresponding method and system for converting the wavelet compression image into the JPEG image. According to the invention, the efficiency of image transcoding can be significantly improved; the conversion time is reduced; and the methods and the systems are suitable for fast conversion between mass JPEG images and wavelet compression images.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a method for converting a JPEG image into a wavelet compressed image, a system for converting a JPEG image into a wavelet compressed image, a method for converting a wavelet compressed image into a JPEG image, and a A system for transforming wavelet-compressed images into JPEG images. Background technique [0002] In 1993, the Joint Picture Experts Group (Joint Picture Experts Group) formulated an international standard for continuous-tone still image compression coding - the first generation image compression standard: JPEG standard. In the twenty years after the JPEG standard came into being, because of its simplicity of implementation and less resources required, it has always been the mainstream technology of digital image compression coding and has attracted much attention from all sides. With the rapid development of electronic equipment and multimedia tec...

Claims

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Application Information

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IPC IPC(8): H04N19/63
Inventor 甄海华
Owner GUANGDONG VTRON TECH CO LTD
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