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Method for changing one high dynamic-range image into a lower dynamic range image and apparatus thereof

A technology with high dynamic range and low dynamic range, applied in graphics and image conversion, image communication, image data processing, etc., can solve problems such as poor image processing efficiency and image quality degradation, and achieve good image processing efficiency and tone mapping procedures simple effect

Inactive Publication Date: 2009-05-27
INVENTEC APPLIANCES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the final LDR image is displayed on a standard display device, it will correspond to the situation where the observer sees the captured scene, but due to the addition of visual effects, the quality of the image will still be reduced
In addition, this method must cooperate with complex real-time calculations to add the desired visual effects to the LDR image. Such time-consuming and complex calculations will eventually lead to poor image processing efficiency.

Method used

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  • Method for changing one high dynamic-range image into a lower dynamic range image and apparatus thereof
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  • Method for changing one high dynamic-range image into a lower dynamic range image and apparatus thereof

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Embodiment Construction

[0016] see figure 1 , figure 1 It is a flowchart of an embodiment of the tone mapping process of the present invention. will be detailed below figure 1 The steps included in . Firstly, an HDR image is loaded prior to step 100 . As mentioned above, the loaded HDR image is generated from a plurality of images obtained under different exposure conditions, and the corresponding dynamic range is greater than that of a standard display device. Therefore, the original dynamic range of the input HDR image must be compressed to a low dynamic range suitable for standard display devices. In addition, the human visual system is not sensitive to absolute luminance, but relatively has a greater response to local luminance changes, and will reduce the large global illumination difference the resulting effect. Therefore, a global gradient compression procedure is performed in step 102 to compress the original dynamic range and reduce the overall brightness difference. In order to reduc...

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Abstract

The invented method includes the following steps: a) converting several first brightness values correspondent to several pixels into several second brightness values; and b) using a film conversion function to make these second brightness values correspondent to these pixels be antipodal to several third brightness values so as to produce said low-dynamic range image.

Description

technical field [0001] The invention provides an image processing method and a related device, especially a method and device for converting a high dynamic range image into a low dynamic range image. Background technique [0002] The dynamic range of a scene is defined as the ratio between the highest scene brightness and the lowest scene brightness. Typically, a standard display device (such as a CRT monitor or LCD monitor) has a dynamic range of about 250:1, which covers about half of the entire visible color range. However, the human vision system (HVS) generally has a dynamic range greater than 10,000:1, and can distinguish about 10,000 different colors at a certain brightness. In addition, a computer-generated image (CGI) usually has a proportional relationship between the highest and the lowest intensity value (intensity value) approximately equal to 3000 times. [0003] Generally, an image displayed on a standard display device can correspond to 256 different gray l...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B7/08H04N5/225G06T3/00
Inventor 傅楸善符绩耀高朝阳
Owner INVENTEC APPLIANCES CORP