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Estimation method for video image illumination distribution

A technology of illuminance distribution and video image, applied in image analysis, image data processing, calculation, etc., to achieve the effect of video image quality enhancement

Inactive Publication Date: 2009-08-19
SICHUAN PANOVASIC TECH
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Problems solved by technology

[0011] The purpose of the present invention is to overcome the shortcomings of the existing video image brightness distribution estimation, and provide a method that can better estimate the illuminance distribution and change characteristics of the video image acquisition scene, so that the parameter adjustment of the subsequent image enhancement processing is more accurate. Method for Estimating Illumination Distribution of Video Image

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  • Estimation method for video image illumination distribution
  • Estimation method for video image illumination distribution
  • Estimation method for video image illumination distribution

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Embodiment Construction

[0026] In order to better understand the present invention, the present invention will be described in more detail below in conjunction with specific embodiments. In the following description, when detailed descriptions of existing prior art may obscure the subject matter of the present invention, such descriptions will be omitted here.

[0027] Figure 1~4 What is shown is the prior art, which has been described and illustrated in the background art, and will not be repeated here.

[0028] Figure 5 It is a flow chart of a specific embodiment of the present invention. In this embodiment, the following steps are included:

[0029] Step ST1: calculate the luminance value of each pixel of the original image Img according to the following commonly used luminance component formula:

[0030] Luminance=0.27red+0.67green+0.06blue (1)

[0031] Among them, red, green, and blue respectively represent the red, green, and blue three-color components of the color image.

[0032] Get ...

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Abstract

The invention discloses an illumination distribution evaluation method of a video image, comprising the steps as follows: by gradient screening, the gradient vector influence on a part where a gradient magnitude is larger than a gradient threshold value or on edges is eliminated; and an illumination image reconstruction is carried out to a gradient vector image after screening so as to obtain an illumination image, thereby effectively eliminating the influence on the statistics of image illumination distribution, which is caused by the serious change of reflectivity of a scene surface, and accurately evaluating the characteristics and distribution change of light source illumination in a video collecting scene. The illumination distribution evaluation method can be combined with subsequent image enhancement processing such as histogram equalization, gamut mapping, gamma correction and the like, thereby achieving the effect of enhancing the video image quality.

Description

technical field [0001] The present invention relates to the technical field of video enhancement, in particular, to a method for estimating the distribution of illuminance of a video image. Background technique [0002] In the video image enhancement processing system, the equalization, mapping, correction and other processing of the brightness distribution of the image are very important technical means to enhance the image quality. Such as histogram equalization, color gamut mapping, gamma correction and other common techniques. However, image enhancement often requires estimation of the brightness distribution of the current video image to be processed. [0003] The existing video image brightness distribution estimation techniques mainly fall into two categories: one is the local brightness distribution estimation technology, and the other is the global brightness distribution estimation technology. [0004] A typical representative of local brightness distribution est...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T7/40
Inventor 袁梓瑾吴亚东李慧然
Owner SICHUAN PANOVASIC TECH
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