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Method and device for coding and decoding image

An encoding method and encoding technology, applied in the field of image encoding, decoding method and encoding and decoding device, can solve the problems of high speed, low power consumption, and the compression algorithm cannot satisfy the complexity at the same time, and achieve the effect of improving performance

Active Publication Date: 2013-06-19
ANALOGIX CHINA SEMICON +1
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Problems solved by technology

[0007] The main purpose of the present invention is to provide an image encoding and decoding scheme to solve the problem that the image compression algorithm in the related art cannot simultaneously meet the hardware circuit design requirements of low complexity, low power consumption, and fast speed

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  • Method and device for coding and decoding image

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Embodiment Construction

[0030] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0031] According to an embodiment of the present invention, an image coding method is provided. figure 1 is a flowchart of an image encoding method according to an embodiment of the present invention, such as figure 1 As shown, the method includes the following steps:

[0032]Step S102, calculating the actual length of the first prediction error value of the color channel of the pixel adjacent to the pixel to be encoded in the row of pixels above the pixel to be encoded in the image and the second prediction error value of the color channel of the pixel to be encoded;

[0033] Step S104, determining the selected encoding length according to the actual length of the first prediction error valu...

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Abstract

The invention discloses a method and a device for coding and decoding an image. The coding method comprises the following steps of: calculating the actual length of a first prediction error value of a color channel of pixels adjacent to pixels to be coded in the last row of pixels of the pixels to be coded in the image and the actual length of a second prediction error value of a color channel of the pixels to be coded; determining the used coding length according to the actual length of the first prediction error value and the actual length of the second prediction error value; and writing a coding rule tag corresponding to the coding length and the second prediction error value into code stream corresponding to the pixels to be coded according to the coding length. By adopting the method and the device, the problem that the compression algorithm for the image cannot simultaneously meet the design requirement of a hardware circuit with low complexity, low power consumption and high speed is solved, so that the performance of the image compression algorithm is improved.

Description

technical field [0001] The present invention relates to the communication field, in particular to an image encoding and decoding method and an encoding and decoding device. Background technique [0002] Image is an extremely important carrier for carrying information in multimedia. However, the data volume of uncompressed digital images is very huge. In order to save information storage space and improve information transmission efficiency, a large amount of actual data must be compressed. [0003] There are many image compression algorithms. Generally, it is necessary to decorrelate the image first, and then encode it. Decorrelation processing can be based on prediction or transformation, for example, Context-based Adaptive Lossless / Nearly-Lossless Coding (Context-based Adaptive Lossless / Nearly-Lossless Coding, CALIC for short) for continuous tone static images ) and JPEG-LS (Joint Picture Expert Group-LS, a context-based adaptive lossless / near-lossless predictive codin...

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Application Information

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IPC IPC(8): H04N7/26H04N7/50H04N19/48
Inventor 李瑞玲
Owner ANALOGIX CHINA SEMICON
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