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Judgment method and judgment device for light gradient of picture

A determination method and image technology, applied in the field of video encoding and decoding, can solve the problems of insufficiency, decreased effect, and loss of advantages of detection algorithms, and achieve the effect of small calculation amount and easy implementation.

Active Publication Date: 2015-06-03
深圳市梦网视讯有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is based on the assumption that the variance of the black image is 0 with the help of black color information and settings. However, these two points cannot be satisfied in the actual source of the film: on the one hand, the actual black image is not a single value, which makes the variance of the black image as 0 this assumption is not established; on the other hand, the black color seen by the human eye has a wider distribution in the numerical value of the actual image, which is determined by the visual sensitivity (for example: the actual video source of the YUV format, people for Y= 0, 1, ..., 20, U=V=128, all pixels will be judged as black)
This characteristic of the actual image source makes the detection algorithm of the existing technology lose its advantage in application, and the effect also drops sharply

Method used

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  • Judgment method and judgment device for light gradient of picture

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Experimental program
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Embodiment 1

[0020] Embodiment 1. The present invention provides a method for judging that light gradients occur in images. The premise of the judging method is that all images are assumed to be n-bit images with the same resolution. The brightness values ​​of all pixels in the image constitute the brightness information of the image, and the number of rows and columns of the brightness information of the image are: height, width. The n-bit map in the present invention means that each pixel of the image is represented by n-bit unsigned integers.

[0021] see figure 1 , the method includes the following steps:

[0022] Step 101: Obtain a first reference image and a second reference image;

[0023] In this step, the method for selecting the first reference image and the second reference image can be:

[0024] (1) choose the image that satisfies the playback sequence number to be less than the current image playback sequence number as the first reference image; choose the image that satisf...

Embodiment 2

[0057] Embodiment 2, the present invention also provides a judging device for light gradation in an image, the judging device includes: a first acquiring unit, a first judging unit, a second acquiring unit, a third acquiring unit, a fourth acquiring unit, Light gradient determination unit;

[0058] a first acquiring unit, configured to acquire a first reference image and a second reference image;

[0059] The first judging unit is used to judge whether the first reference image and the second reference image conform to the reference image standard, and notify the second, third, and fourth acquisition units if they conform to the reference image standard; if not, notify the first acquisition unit The unit continues to acquire the first reference image and the second reference image;

[0060] The second acquiring unit is configured to receive the notification sent by the first judging unit that conforms to the reference image standard, and acquire the probability distribution o...

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Abstract

The invention provides a new judgment method for light gradient of a picture for a film source with illumination variation. The method comprises the steps of calculating probability distribution of luminance information of the current picture and two reference pictures, and then detecting the picture with the light gradient by using variation characteristics of the probability distribution of the three pictures. As the method uses the reference pictures to assist in judgment, the method can be rapidly combined with a video encoding and decoding technique; in addition, the method only uses the variation of the probability distribution of the three pictures for judgment, and the method has the characteristics that the calculation load is small and the implementation is convenient.

Description

technical field [0001] The present invention relates to the field of video encoding and decoding, in particular to a method and device for judging light gradients in images. Background technique [0002] When the global illumination changes in the video image, an image with light gradients will be produced (for example, the movie picture changes from bright to dark, and then completely hidden; the movie picture changes from dark to bright, and finally completely clear). At this time, on the one hand, the luminance information of adjacent frame images will change relatively greatly, but on the other hand, because the main content correlation of the image still exists, the information redundancy between frames of the video image is still very large. At this time, if the inter-frame prediction technology of the conventional encoder is used, the correlation between the two cannot be judged, so that the intra-frame prediction mode suddenly increases and the code rate rises rapidl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N17/02H04N9/11
Inventor 洪婷
Owner 深圳市梦网视讯有限公司