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Method for display equipment with narrow dynamic range to reproduce image with wide dynamic range

A technology with high dynamic range and low dynamic range, applied in static indicators, cathode ray tube indicators, color signal processing circuits, etc., can solve problems such as whether the color is affected or not

Inactive Publication Date: 2012-05-02
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the tone mapping method is mostly a mapping process in the brightness channel, and rarely considers whether the color is affected

Method used

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  • Method for display equipment with narrow dynamic range to reproduce image with wide dynamic range
  • Method for display equipment with narrow dynamic range to reproduce image with wide dynamic range
  • Method for display equipment with narrow dynamic range to reproduce image with wide dynamic range

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Embodiment Construction

[0059] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0060] see figure 1 , the embodiment mainly includes the following steps:

[0061] First determine the display device and display environment, 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%, the reflection brightness L of the light source on the display screen in the computing environment refl . For the convenience of specific implementation reference, the further scheme of the embodiment is provided, the brightness L reflected by the light source on the display screen refl Calculated as follows:

[0062] L refl = k π E amb

[0063] Among them, E amb is the illuminance of the lig...

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Abstract

The invention relates to a method for display equipment with narrow dynamic range to reproduce an image with wide dynamic range. The dynamic range of the image can be compacted by simulating the process of color vision processing information of human eyes and the texture details and colors of scenes in the images with wide dynamic range can be correctly reproduced on the display equipment with narrow dynamic range. The method comprises the following steps of: reading a real luminance value of each pixel RGB (Red, Green and Blue) channel in the image with wide dynamic range; converting the RGBinto XYZ value; calculating the adaptation luminance of each pixel; carrying out the chromaticity adaptation adjustment of a light source under each adaptation luminance; simulating a photo-inductioncell response mechanism and calculating the relative response value under each adaptation luminance; and converting to an orthogonal opposite space by using PCA (Principal Component Analysis) and simulating an edge phase resistance mechanism of a center-peripheral perceptive cell structure for further processing. The invention can be used for compressing the image with wider dynamic range at highefficiency so as to adapt to the display equipment with narrow dynamic range or paper.

Description

technical field [0001] The invention belongs to the technical field of reproduction in digital image processing, in particular to a method for displaying and reproducing a high dynamic range image on a low dynamic range display device (such as a monitor and paper). Background technique [0002] The commonly used images with 8 bits per channel are called low dynamic range images. This type of image cannot record the real brightness in the scene, but only records the visually coded, limited tonal relationship (usually only 256 tones per channel), and the final effect of the recorded scene must be determined according to the specific display device . If the maximum display brightness of a monitor is 100cd / m2 and the dynamic range is 100:1, it can only correctly display the light and shadow effects in the scene between 1cd / m2 and 100cd / m2 brightness, and cannot present the complete light and shadow effects of the original scene. Therefore, it is also known as a device-dependen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/64G09G5/02
Inventor 万晓霞谢德红
Owner WUHAN UNIV
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