Image compression method
A technology for image compression and code stream compression, applied in the field of image compression, which can solve the problems of single-pixel line color loss, line discarding, etc.
Inactive Publication Date: 2007-06-13
逐点半导体(上海)股份有限公司
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At this time, if the method of downsampling in YUV chromaticity space is used for compression, when the single-pixel line is not at the sampling point, the UV value of the line will be discarded, and the UV value of the adjacent sampling point will be used as the decompression. Its UV value, because the color of the line itself is different from the color of adjacent pixels, the color of the single-pixel line will be lost, which is not acceptable to users in PC and monitor applications
Therefore, this defective compression method for compressing unnatural graphics and pictures has great limitations when applied to PCs and monitors.
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[0018] In image processing and video processing, frame storage is required. In order to save storage space and meet certain data bus bandwidth requirements, an image compression method can be used for image compression. The compression method must have the characteristics of low computational load, low resource consumption and no loss of subjective visual quality. Downsampling of chroma components in YUV chroma space is widely used in various image and video compression. However, since PC monitors and monitors often display single-pixel lines or various artificially drawn images, this YUV space compression method will cause loss of single-pixel and line colors that are unacceptable to the human eye, or color loss at the edge of the image. Phenomenon. In order to compress single-pixel lines or various graphics without losing subjective visual quality, the present invention can adaptively select YUV or RGB color space for image compression to make up for the defect of YUV chro...
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The method includes following steps: (1) picking up RGB values of two adjacent pixels, and converting them to YUV values; (2) calculating U difference and V difference of two pixels; (3) if U difference exceeds first threshold value and / or V difference exceeds second threshold value, then executing step (4); if U difference is smaller than first threshold value and / or V difference is smaller than second threshold value, then executing step (5); (4) under RGB colority space, compressing the two pixels, then executing (6); (5) under YUV colority space, 2 times sampling chromatic component is carried out for the two pixels, and then executing (6); (6) output compressed code flow, then picking up RGB values of next two adjacent pixels, and executing (1). The invention can carry out image compression in YUV colority space and RGB colority space under selfadaption. Color of line in single pixel will not be lost in the process method.
Description
technical field [0001] The invention relates to an image compression method, in particular to an adaptive image compression method for image compression in YUV color space or RGB color space. Background technique [0002] With the development of digital technology and information technology, the application of multimedia is becoming more and more extensive. Uncompressed multimedia data, such as image data, video data and audio data, require large storage space and transmission bandwidth. In order to save costs, the use of data redundancy to compress the original data and then store and transmit it has become an important content in the field of information processing research and chip manufacturing. [0003] Since the human eye is more sensitive to the luminance information Y than the chrominance information UV, the existing image compression method is to convert the RGB chromaticity space to the YUV chromaticity space, and perform compression with different compression rat...
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IPC IPC(8): H04N11/02
Inventor 李蔷
Owner 逐点半导体(上海)股份有限公司