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Method for displaying high dynamic range image on common display device

A technology for high dynamic image and display devices, used in image communication, static indicators, cathode ray tube indicators, etc.

Inactive Publication Date: 2014-07-09
XIANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these applications will encounter a common problem, that is, the problem of correctly displaying and reproducing high dynamic range images on existing low dynamic range display devices.

Method used

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  • Method for displaying high dynamic range image on common display device
  • Method for displaying high dynamic range image on common display device
  • Method for displaying high dynamic range image on common display device

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] Such as figure 1 As shown, a method for displaying high dynamic images on a common display device of the present invention comprises the following steps:

[0030] 1. Pretreatment

[0031] Read in high dynamic images to obtain macro information such as image size, maximum and minimum brightness of images;

[0032] 2. Continuousization of discrete data:

[0033] Determine the maximum and minimum values ​​of brightness, and change other brightness values ​​into the range of real numbers, perform logarithmic operations, and map them in the [0, 1] real number interval,

[0034] L D = log ( L W + A ) - log ...

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Abstract

The invention discloses a method for displaying a high dynamic range image on a common display device. The method comprises preprocessing, discrete data continuing, continuous interval distribution optimal quantification, structure feature factor calculating, structure feature factor quantification, and comprehensive mapping. After the image is processed with the method in the invention, the brightness value is re-quantified to be Ri, j, 256 quantification grades within 0-255 in total, and the image can be displayed on the common display device; the structure features are taken into consideration fully; and at the place where the edge is relatively obvious, a method for enlarging contrast degree is utilized to enable the edge to be clearer and more obvious. After the high dynamic range image is processed by utilizing the method, the common display device can display the content of the image; the brightness space is optimized and reconstructed, so that the brightness distribution is guaranteed to be uniform; and the reservation of edge features is taken into consideration, so that the edge features are guarantees on the premise of convenient operation. Real number operation is utilized only at the step of discrete data continuing, and the other steps utilize integer operation, thereby guaranteeing operation complexity not to be increased obviously.

Description

technical field [0001] The invention relates to the technical field of reproduction in digital image processing, in particular to a method for displaying high dynamic images on common display devices. 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-dependent image. A high dynamic range image (High Dynamic Range image, H...

Claims

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Application Information

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IPC IPC(8): G09G5/00H04N5/57
Inventor 李卫斌
Owner XIANYANG NORMAL UNIV
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