High dynamic range compression method based on multiscale DoG filter

A technology of high dynamic range and compression method, which is applied in the direction of instruments, static indicators, cathode ray tube indicators, etc., and can solve the problems that cannot reflect the relationship between the mutual influence of image pixel colors

Inactive Publication Date: 2012-07-11
WUHAN UNIV
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Problems solved by technology

However, these models cannot yet reflect the relationship between the color interactions between image pixels, and the application to high dynamic range compression needs to be further improved

Method used

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  • High dynamic range compression method based on multiscale DoG filter
  • High dynamic range compression method based on multiscale DoG filter
  • High dynamic range compression method based on multiscale DoG filter

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Embodiment Construction

[0071] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0072] figure 1 The flow chart of the high dynamic range compression copying method based on the partial relative visual perception of the human eye is given in the present invention, which mainly includes the following steps:

[0073] The embodiment determines the display device and the display environment in advance, such as displaying on an indoor CRT display, then the indoor illuminance E amb is 200lux, the maximum display brightness of CRT is 80cd / m2, and the screen reflection coefficient k is 4%, calculate the reflection brightness L of the display screen surface refl , if displayed on paper, this step is not required.

[0074] Step 1, convert from the sRGB space value of each pixel of the high dynamic range image to the XYZ space value, and the value of each pixel (x, y) in the image XYZ space is denoted as X(x, y), Y(x, y), Z (x, y).

[0075...

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Abstract

The invention relates to a high dynamic range compression method based on a multiscale Difference of Gaussian (DoG) filter. The high dynamic range compression method is used for compressing the dynamic range of an image to cause the image to adapt to be displayed on a display equipment or paper with a low dynamic range, and simultaneously reserves the texture detail and the colour of a scene in the high dynamic range image. The invention comprises the following steps: firstly, reading an RGB value from the high dynamic range image, and calculating and observing the adaptability luminance of each pixel by the multiscale DoG filter; secondly, carrying out chroma adaptive adjustment on each adaptability luminance, and obtaining the cone response value displayed by each pixel by keeping the mapping relationship correspondingly sensed by a cone cell; and finally, obtaining an image displayed on the display equipment or paper. The invention can effectively compress the dynamic range of the image and can cause the original scene of the high dynamic range image to correctly reappear on the display equipment or paper with low dynamic range.

Description

technical field [0001] The invention belongs to the technical field of reproduction in digital image processing, and in particular relates to a high dynamic range compression method based on a multi-scale DoG filter. Background technique [0002] A high dynamic range image usually refers to an image in which the ratio of the maximum brightness to the minimum brightness of the image exceeds 1000:1, and can directly record scenes within the visible range of the human eye (the brightness range of the scene is 10 -6 cd / m 2 to 10 8 cd / m 2 ). Existing ordinary low dynamic range images cannot directly record the brightness of the scene, but record the tone relationship of the scene, and its dynamic range is generally about 100:1. Therefore, compared with ordinary images, high dynamic range images have a wider color space and richer layers, and can record more realistic light and shadow effects. Based on these advantages of high dynamic range images, industries such as film and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26G09G5/02G09G5/10H04N19/85H04N19/90
Inventor 万晓霞谢德红
Owner WUHAN UNIV
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