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Wide-dynamic-range image compression method

A technology of wide dynamic image and compression method, which is applied in the direction of image communication, digital video signal modification, electrical components, etc., can solve the problems of losing image texture or brightness information, unable to complete wide dynamic image reconstruction, etc., and achieves short operation time and improved The effect of high quality and high compression ratio

Inactive Publication Date: 2014-08-20
杭州吉瑞邦智能科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a wide dynamic image compression method, which mainly solves the technical problems of losing image texture or brightness information due to the limitation of bit depth in the image compression process existing in the prior art, and unable to complete the reconstruction of wide dynamic images, etc.

Method used

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  • Wide-dynamic-range image compression method

Examples

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Embodiment 1

[0015] Embodiment 1: a kind of wide dynamic image compression method of this example, as figure 1 , the steps are:

[0016] a. Divide a piece of original image data with a resolution of 1920×1080 and a bit depth of 12 bits into 960×540 subregions with adjacent 2×2 pixels as a subregion;

[0017] b. Calculate the mean value of the image pixels in each 2×2 area, and intercept the upper 7 bits of the mean value as the brightness information of the original data image, and obtain the image brightness information data with a bit depth of 7 bits and a data number of 960×540;

[0018] c. In each 2×2 region, multiply the original data by the scaling factor s=2 2 Finally, calculate the ratio of the obtained value to the high 7-bit data of the pixel mean value obtained in step b, and perform rounding operation on the ratio to obtain image texture information with a depth of 7 bits;

[0019] d. Utilize common compression algorithms, such as standard JPEG compression coding, to comp...

Embodiment 2

[0020] Embodiment 2: a kind of wide dynamic image compression method of this example, as figure 1 , the steps are:

[0021] a. A piece of original image data with a resolution of 2048×1536 and a bit depth of 14 bits is divided into 512×512 sub-regions with adjacent 4×3 pixels as a sub-region;

[0022] b. Calculate the mean value of the image pixels in each 4×3 area, and intercept the upper 8 bits of the mean value as the brightness information of the original data image, and obtain the image brightness information data with a bit depth of 8 bits and a data number of 512×512;

[0023] c. In each 4×3 region, multiply the original data by the scaling factor s=2 2 Finally, calculate the ratio of the obtained value to the high 8-bit data of the pixel mean value obtained in step b, and perform rounding operation on the ratio to obtain image texture information with a depth of 8 bits;

[0024] d. Utilize common compression algorithms, such as standard JPEG compression coding, t...

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Abstract

The invention relates to an image compression technology, in particular to a wide-dynamic-range image compression method. The wide-dynamic-range image compression method mainly solves the technical problems that in the image compression process in the prior art, image texture or brightness information is lost through being limited by the bit depth, the rebuilding of wide-dynamic-range images cannot be completed, and the like. According to the wide-dynamic-range image compression method, the brightness information and the texture information of the images are separated, two groups of image data after the bit depth reduction are obtained, and then, the brightness information and the texture information of the images are respectively compressed.

Description

technical field [0001] The invention relates to an image compression technology, in particular to a wide dynamic image compression method. Background technique [0002] Dynamic range refers to the brightness ratio of the brightest and darkest parts of an image, which characterizes the adaptability of the image acquisition device to the brightness of the scene. Wide Dynamic Range Image refers to an image with a wide brightness span, which can accurately reflect the details of the scene in a scene with a large contrast between light and dark. [0003] Image compression refers to the removal of redundant information in the original image under the premise of ensuring the quality of the reconstructed image, so as to achieve the purpose of expressing as complete image information as possible with as little data as possible. [0004] At present, in commonly used compression methods, such as the JPEG (Joint Photographic Experts Groups) encoding method, the input data and output da...

Claims

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Application Information

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IPC IPC(8): H04N19/186H04N19/132
Inventor 周盛民
Owner 杭州吉瑞邦智能科技有限公司
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