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Image coding method

A technology of image coding and original image, applied in the field of image coding, which can solve the problems of image content distortion and users’ inability to distinguish images, etc., achieve high compression rate, good display quality and compression ratio, and ensure the effect of display quality

Inactive Publication Date: 2012-08-15
BEIHANG UNIV
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Problems solved by technology

[0005] In the case of high compression ratio, the content of the image will be seriously distorted, so that users cannot tell what the content of the image is, which is also a shortcoming of traditional general compression methods.

Method used

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Embodiment Construction

[0035] The present invention will be further described in detail below in conjunction with accompanying drawings and examples.

[0036] The image coding method proposed by the present invention takes image content into consideration, and has high compression ratio, better display quality and progressive transmission characteristics, which makes the method of the present invention applicable to various occasions, especially with the popularization of smart phones and mobile With the continuous development of the Internet, more and more family photos are shared and transmitted among different people, and due to the limitation of wireless network speed, images must have a high compression ratio, but this may affect the display quality of the pictures, giving adverse effects on users. If the method of the present invention is adopted, while ensuring a high compression ratio, the display quality of the region of interest of the user can also be taken into account, which can better ...

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Abstract

The invention provides an image coding method which is applied to the field of computer image processing. The method comprises the following steps of: firstly, marking the region of interest in an image; performing wavelet transform of the original image; finding the wavelet coefficient corresponding to the pixel of the region of interest after the transform in a wavelet coefficient matrix; then,quantizing the background region and the region of interest according to different quantizing standards so that the coefficient of the region of interest is located in a higher plane; performing threshold quantization of the wavelet coefficient matrix nearby; and coding by a method based on SPIHT (set partitioning in hierarchical trees). The method provided by the invention guarantees the high compression ratio as well as the display quality of the region of interest of a user; and when transmitting or browsing an image in a wireless network with a relatively low rate, the method can enable the user to get the most important information in the image very soon.

Description

technical field [0001] The invention belongs to the field of computer image processing and provides an image coding method. Background technique [0002] In the process of digital image processing, large files containing image data are often produced, and these files often need to be exchanged between users and systems, so there must be an effective method to store and transmit these digital image files. Therefore, the main purpose of image coding and decoding is to reduce the space occupied by images as much as possible while ensuring image quality, so as to facilitate storage or network transmission. [0003] Specifically, image compression (encoding) can be divided into lossless compression and lossy compression. Lossless compression generally adopts methods based on statistics, such as Huffman coding, etc., which can completely reconstruct the original image, but the compression rate is low, which often cannot meet people's requirements. Lossy compression cannot comple...

Claims

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Application Information

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IPC IPC(8): G06T9/00
Inventor 牛建伟周成玉童超
Owner BEIHANG UNIV
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