JPEG lossless compression method based on open-exr image

A lossless compression, RGB image technology, applied in the direction of image communication, digital video signal modification, electrical components, etc., can solve the problems of data loss, reduce the definition of details in the image, etc., and achieve the effect of convenient format conversion

Inactive Publication Date: 2020-01-17
SHANGHAI UNIV
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  • Claims
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Problems solved by technology

However, JPEG is a kind of lossy compression, and some data will be lost after compression, so the clarity of details in the image will be reduced

Method used

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  • JPEG lossless compression method based on open-exr image
  • JPEG lossless compression method based on open-exr image
  • JPEG lossless compression method based on open-exr image

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Embodiment Construction

[0034] The preferred embodiments of the present invention are described in detail as follows:

[0035] see Figure 1 ~ Figure 3 , which is based on JPEG lossless compression of OPEN-EXR images, the specific steps are as follows:

[0036] (1) The source OPEN-EXR image used is a 16bit RGB image, and the image size of each color channel is 512x512. Take the R channel as an example (others are the same), move each pixel according to the raster scan order, and read each pixel value P i The floating-point value of .

[0037] (2) The displayed image can only display the range from 0 to 1. If it is less than 0, it will be completely black by default, and if it is greater than 1, it will be completely white by default. Therefore, we change the floating-point value as shown in formula (2-1), and convert the 16-bit floating-point value into an 8-bit integer value. Convert each pixel of the R, G, and B channels in the order of raster scanning according to formula (2-1) to obtain the cor...

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Abstract

The invention discloses a JPEG (Joint Photographic Experts Group) lossless compression method based on an OPEN-EXR image. Taking a 16bit OPEN-EXR image as an example, the method comprises the following steps: firstly, reading out floating point values of pixel points of RGB three channels from an original OPEN-EXR image, finding corresponding 8bit integer values according to characteristics of the floating point values, and saving the 8bit integer values as a JPEG image; and then converting the floating point values of images of the three channels into 16bit integer values, performing data lossless compression by using Huffman encoding, and storing compressed data streams in a file header of the original JPEG image. The JPEG image synthesized by the method disclosed by the invention keeps an original image style well. The size of the synthesized image can be adjusted proportionally according to Huffman compression, thereby realizing a relatively high compression rate. The image can be restored into an original OPEN-EXR image after image compression due to the header file format of a JPEG format, so that JPEG lossless compression of the OPEN-EXR image is realized.

Description

technical field [0001] The invention relates to a JPEG lossless compression method based on OPEN-EXR images. Background technique [0002] With the popularity of various large-scale 3D movies, such brilliant and colorful images in movies have fascinated the audience, and most of the 3D movies use the image format of OPEN-EXR, so the research on OPEN-EXR It's bound to be a hit. It is a file format used by the visual effects industry for high dynamic range images. This film format has high color fidelity and dynamic range suitable for film production. Simply put, OPEN-EXR is an image with a very wide brightness range. It has a larger brightness data storage than other formats of images, and its way of recording brightness is different from traditional pictures, using 16-bit and 32-bit The floating-point data is used to replace the traditional 8-bit plastic image. The color information range of the floating-point image is from negative infinity to positive infinity, but what...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/42H04N19/70H04N19/96H04N19/182H04N19/186
CPCH04N19/182H04N19/186H04N19/42H04N19/70H04N19/96
Inventor 钱振兴汪益琪潘琳张新鹏
Owner SHANGHAI UNIV
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