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Method and device for processing image

A technology of image processing and image histogram, applied in image data processing, image enhancement, image analysis, etc., can solve the problem of low image contrast, achieve high image contrast, simple method, and good versatility

Active Publication Date: 2009-11-18
GLOBAL INNOVATION AGGREGATORS LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention aims at the problems existing in the prior art, and provides an image processing method and device, the method and algorithm are simple, can solve the problem of low image contrast in a backlight environment, and will not cause layering of the processed image

Method used

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  • Method and device for processing image
  • Method and device for processing image

Examples

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Embodiment Construction

[0027] The histogram of an image describes the grayscale content of the image, and the histogram of any image contains rich information, such as figure 1 Shown is the image histogram in the backlight environment involved in the embodiment of the present invention, figure 1 In the shown histogram, the abscissa represents the brightness value of the pixel in the image, and the ordinate represents the number of pixels corresponding to each brightness value. A certain peak in the histogram indicates that the number of pixels with this brightness value is relatively large, that is, the "peak" corresponds to a large area of ​​the same brightness in an image. In a typical face backlight environment, the face and the background environment occupy the largest area in the entire image. At this time, the face is relatively dark and is in the dark block area, while the background is very bright and is in the bright block area. According to the histogram The above-mentioned characteristic...

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Abstract

The embodiment of the invention relates to a method and a device for processing an image. The method for processing an image comprises the following steps: generating an image histogram of an image to be processed; judging whether the image to be processed needs backlight compensation or not according to the image histogram; if the image to be processed needs backlight compensation, confirming a first brightness boundary value A for distinguishing whether the backlight compensation is carried out and confirming a second brightness boundary value C for distinguishing positive backlight compensation and negative backlight compensation; and carrying out the backlight compensation to pixels with the brightness value ranging from 0 to A in the image to be processed. The embodiment of the invention has simple method, good commonality and high image contrast after the backlight compensation, can not generate the phenomena of background overexposure and delarmination and better processes the image in a backlight environment.

Description

technical field [0001] The invention relates to digital signal processing technology, in particular to an image processing method and device. Background technique [0002] With the development of information technology, there are more and more digital terminals with camera and camera functions, such as camcorders, portable cameras, mobile terminals with camera / video functions, telephone terminals with visual communication functions, conference TV terminal etc. These terminals contain a processor for processing image and video data obtained by image or video acquisition devices. When acquiring images or videos, when the subject subject being photographed is behind a very bright background or there is a luminous light source, the subject subject subject will be in a backlight state. An image or video obtained under backlighting has a very bright background and a very dark foreground subject. The image quality of images or videos acquired in a backlit environment is so degra...

Claims

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Application Information

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IPC IPC(8): H04N5/235H04N5/243G06T5/40
CPCH04N5/243H04N5/2351G06T2207/10016G06T2207/20008G06T5/009G06T5/40H04N23/76H04N23/71G06T5/92
Inventor 魏小霞龙彦波
Owner GLOBAL INNOVATION AGGREGATORS LLC
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