Image enhancement method under ambient light

An image enhancement and ambient light technology, applied in the field of image processing, can solve the problems of display image detail loss, contrast loss, display image loss, etc.

Active Publication Date: 2016-08-03
XIDIAN UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Ambient light not only loses the contrast of the displayed image, but also loses the brightness of the displayed image
Especially under strong ambient light, the brightness loss is more serious than other losses, which will lead to the overall darkening of the displayed image, and cause a large amo

Method used

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  • Image enhancement method under ambient light
  • Image enhancement method under ambient light

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Embodiment 1

[0085] The invention provides an image enhancement method under ambient light, such as figure 1 As shown, the image enhancement method under the ambient light includes:

[0086] 11. Extract the luminance value of the original image, and determine the visibility threshold for the display image displayed by the display device in combination with the background luminance mask model.

[0087] 12. According to the visibility threshold and in combination with the light intensity of the environment where the display device is located, determine a brightness-enhanced image corresponding to the display image under ambient light.

[0088] 13. According to the light intensity of the environment where the display device is located, respectively generate display images under indoor lighting and outdoor lighting, and determine a gradient gain function of the display images in combination with a just perceivable error model.

[0089] 14. Extract the gradient value of the original image, and...

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Abstract

The invention discloses an image enhancement method under ambient light, and belongs to the field of image processing. The image enhancement method comprises the steps that the brightness value of an original image is extracted, a visibility threshold is determined, and a brightness enhanced image is determined through combination of light intensity of the environment in which display equipment is arranged. The gradient gain function of a display image is determined through combination of a just-noticeable-distortion model according to the light intensity of the environment in which the display equipment is arranged so that the enhanced display image under ambient light is acquired through a weighed optimization mode. A readability enhanced color display image is obtained through color spatial conversion. The brightness and the details of the display image are enhanced through a gradient domain optimization framework based on weighting so that readability of the display image under ambient light can be enhanced, the brightness of the display image is enhanced by using a nonlinear transfer function under ambient light, gradient loss caused by ambient light can be compensated by adopting the just-noticeable-distortion model, and finally readability of the image on the display equipment can be enhanced.

Description

technical field [0001] The invention belongs to the field of image processing, in particular to an image enhancement method under ambient light. Background technique [0002] Recently, viewing conditions have become a hot issue in display technology research and have attracted considerable attention from display manufacturers. For example, the color temperature characteristic in lighting performance makes the displayed image appear reddish or bluish. In addition, it is often encountered that different lighting conditions change drastically, such as when the mobile phone is in the office and outdoors. As the light intensity increases the black level brightness of the display device, it will reduce the contrast, color and color gamut size of the display device; especially in daylight conditions, the image displayed on the mobile device will appear dark and lose a lot of detail information . Therefore, under strong outdoor conditions, obtaining images with high brightness, r...

Claims

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Application Information

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IPC IPC(8): G06T5/00
CPCG06T5/009G06T2207/10004G06T2207/10024
Inventor 郑喆坤苏浩楠杜元甲王舒瑶
Owner XIDIAN UNIV
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