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Wide dynamic image enhancement method and apparatus

A technology of a wide dynamic image and enhancement device, which is applied in the field of image processing, can solve the problems of reduced contrast of wide dynamic range images, loss of image details, etc., and achieves the effect of increasing contrast and obvious details.

Active Publication Date: 2016-11-16
SUZHOU KEDA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the contrast of the wide dynamic range image processed by the histogram adjustment method is reduced, thereby losing some details of the image

Method used

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  • Wide dynamic image enhancement method and apparatus
  • Wide dynamic image enhancement method and apparatus
  • Wide dynamic image enhancement method and apparatus

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Experimental program
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Embodiment 1

[0044] This embodiment provides a wide dynamic image enhancement method, such as Figure 1A shown, including the following steps:

[0045] S10: Extract the first gray value of each pixel of the original image.

[0046] Get the grayscale of the image, and increase the contrast of the image by expanding the grayscale range.

[0047] S20: Determine whether the first grayscale value of each pixel is smaller than the first average grayscale value.

[0048] The first average gray value is the average gray value of all pixels in the original image. If less, execute step S30; otherwise, execute the same operation as in the prior art.

[0049] S30: Perform a first function transformation on the first grayscale value to obtain a second grayscale value.

[0050] The first function is an increasing function within a predetermined value range, and is a convex function with a smooth curve.

[0051] Using the feature that the slope of the first function is greater than 1 within the prede...

Embodiment 2

[0074] This embodiment provides a wide dynamic image enhancement device, such as Figure 2A As shown, it includes an extraction unit 10 , a first transformation unit 20 and a display unit 30 .

[0075] An extraction unit 10, configured to extract the first gray value of each pixel of the original image;

[0076] The judging unit 20 is configured to judge whether the first grayscale value of each pixel is smaller than a first average grayscale value; the first average grayscale value is the average grayscale value of all pixels in the original image.

[0077] The first transformation unit 30 is configured to perform a first function transformation on the first grayscale value to obtain a second grayscale value if the first grayscale value is smaller than the first average grayscale value. The first function is an increasing function within a predetermined value range, and is a convex function with a smooth curve.

[0078] The display unit 40 is configured to display an image ...

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Abstract

The invention discloses a wide dynamic image enhancement method and apparatus. The method comprises the following steps of extracting a first grayscale value of each pixel of an original image; judging whether the first grayscale value of each pixel is less than a first average grayscale value or not, wherein the first average grayscale value is an average grayscale value of all pixels of the original image; if the first grayscale value is less than the first average grayscale value, performing first function transformation on the first grayscale value to obtain a second grayscale value, wherein the first function is an increasing function in a predetermined numerical value range and a convex function with a smooth curve; and displaying the image according to the second grayscale value. The grayscale expansion of a low-grayscale region of the original image is realized by utilizing a characteristic that the slope of the first function in the predetermined numerical value range is greater than 1, so that the contrast ratio of the low-grayscale region is increased and details are more remarkable.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a wide dynamic image enhancement method and device. Background technique [0002] During the imaging process of digital images, due to the limitation of the photosensitive characteristics of the light sensor in the imaging device, compared with the natural image, the finally obtained image will lose some details in the bright area or dark area in the natural image. The former is due to overexposure, while the latter is due to underexposure. In view of this, wide dynamic range images are getting more and more attention and favor. Wide dynamic range images (hereinafter referred to as "WDR images") have a wider dynamic range, richer image details and better visual effects. However, the currently widely used CTR / LCR displays are still low dynamic range devices. Therefore, wide dynamic range images can only be displayed after being enhanced, so as to maintain the light and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T2207/20208G06T5/00
Inventor 陶萍陆志洋晋兆龙陈卫东
Owner SUZHOU KEDA TECH
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