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Non-linear brightness correcting method based on accumulative histogram

A cumulative histogram and luminance correction technology, applied in luminance and chrominance signal processing circuits, computing, image enhancement, etc., can solve problems affecting compression and display effects, luminance and chromaticity deviation, etc.

Inactive Publication Date: 2008-12-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Multi-viewpoint videos are captured synchronously by a group of cameras in different positions. Due to differences in camera performance parameters, there will be brightness and chromaticity (brightness and chromaticity) deviations between images in different videos, and this deviation will affect subsequent compression. and display effect

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  • Non-linear brightness correcting method based on accumulative histogram
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  • Non-linear brightness correcting method based on accumulative histogram

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Embodiment Construction

[0050] For convenience of description, the current image of the left-view video is called the left image, and the current image of the right-view video is called the right image. figure 2 is the left image before correction. image 3 is the right image before correction. The non-linear brightness correction steps suitable for multi-view video codec are as follows:

[0051] Step 1, calculate the brightness histogram curve of the left image according to the following formula, denoted as H l (i)

[0052] H l ( i ) = Σ 0 x Width 0 y Hight δ ( P l ( x , ...

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Abstract

The invention publics a non-linear brightness correction method based on the cumulative histogram. It comprises the steps of: 1) statistic the video series about the histogram curve of the current image; 2) get the video series about the cumulative histogram curve of the current image according to the histogram curve; 3) get the non-linear correction function according to the video series about the cumulative histogram curve of the current image; 4) correct the image according to the non-linear correction function get from the step 3) to increase the similarity of left image and right image. The present invention uses the cumulative histogram curve to get the brightness correction model. Cumulative histogram curve processing is the simple and practical method in processing image. Cumulative histogram curve provides the distribution situation of image brightness and an image whole description. The method can correct the brightness difference by changing the shape of the cumulative histogram curve.

Description

technical field [0001] The present invention relates to digital image processing technology, in particular to a nonlinear brightness correction method based on cumulative histogram. Background technique [0002] With the rapid development and wide application of digital video technology, people have higher and higher requirements for video quality and form. Traditional two-dimensional flat video can no longer meet people's needs for real and natural reproduction of scenes, so it can provide stereoscopic Stereoscopic / multi-viewpoint video technology with interactive operation functions has attracted more and more attention from the industry. Compared with monocular video, stereoscopic / multi-viewpoint video increases the representation of scene depth information, and has broad application prospects in stereoscopic TV, free-viewpoint TV, visual conference with a sense of presence, virtual reality and other fields[1][2]. Multi-view video compression and virtual view video image...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/40H04N9/77H04N9/69
Inventor 许士芳陈国斌刘济林
Owner ZHEJIANG UNIV