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A Method of Obtaining Illuminated Uniform Image

An image and uniform technology, applied in image enhancement, image data processing, instruments, etc., can solve the problems that the processing results cannot be guaranteed, and it is difficult to select reference images.

Active Publication Date: 2016-01-13
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The processing results of this method depend heavily on the selection of reference images, which is often difficult to satisfy in practical applications, because the real scene is complex and changeable, it is difficult to select an appropriate reference image, so the final processing results cannot be guaranteed

Method used

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  • A Method of Obtaining Illuminated Uniform Image
  • A Method of Obtaining Illuminated Uniform Image
  • A Method of Obtaining Illuminated Uniform Image

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Embodiment Construction

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] The method for obtaining the uniform illumination image of the present invention is as follows: first calculate the illuminance estimation of the input image, and obtain the uniform illumination image according to the image imaging model; then, use the improved windowed S-function to perform contrast enhancement on the uniform illumination image After processing, the enhanced illumination uniform image is finally obtained. Inaccurate illuminance estimation is the most fundamental cause of the halo problem. The present invention uses a filtering algorithm with superior performance to filter the image to obtain a more accurate illuminance estimation of the image, thereby effectively overcoming the halo problem; The contrast enhancement process is performed on the illuminated image to compensate for the contrast decrease caused by...

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Abstract

The invention discloses a method for acquiring a uniformly illuminated image, which comprises the following steps: (1) computing the illumination estimation of an input image, and acquiring the uniformly illuminated image according to an imaging model; and (2) enhancing the contrast of the uniformly illuminated image by a windowing S function to obtain the enhanced uniformly illuminated image. The principle of the method is simple, the method is easy to operate, and a filtering method with a superior performance is adopted to filter the image to obtain a more accurate illumination estimation on the image, so that the halo problem is effectively overcome; and then the contrast of the uniformly illuminated image is enhanced to compensate contrast decrease caused by ultra-strong or ultra-weak illumination.

Description

technical field [0001] The invention mainly relates to the fields of digital image processing, computer vision, etc., and in particular refers to a method for obtaining uniform illumination images by using a weighted least squares filter to eliminate the influence of illumination on images starting from an image imaging model. Background technique [0002] In real scenes, due to factors such as direct sunlight, reflection, and occlusion, the lighting conditions are more complicated. The image brightness on the side directly exposed to light is very high, or even oversaturated; while the brightness on the side facing away from the dark or occluded light is weak, and the entire scene The dynamic range of the camera is large, and the local contrast of the high dynamic range image collected by the camera is poor, which brings great challenges to the target feature extraction, tracking and pose estimation. [0003] Practitioners in the prior art have proposed various methods to s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 孙晓亮刘肖琳尚洋张小虎张跃强
Owner NAT UNIV OF DEFENSE TECH