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Single color image shadow removal method based on illumination surface modeling

A surface modeling and color image technology, applied in image enhancement, image data processing, instruments, etc., can solve the problems of subjective factors, poor adaptability, and unsatisfactory effects, etc., and achieve strong adaptability, strong applicability, The effect of overcoming errors

Active Publication Date: 2012-08-08
天津渤化安创科技有限公司
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Problems solved by technology

Compared with the previous method, this method is more flexible, but the effect is often not ideal
3) The method based on image extraction usually requires manual intervention, is affected by subjective factors, has poor adaptability, and is not suitable for automatic detection and removal of actual image shadows

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  • Single color image shadow removal method based on illumination surface modeling
  • Single color image shadow removal method based on illumination surface modeling
  • Single color image shadow removal method based on illumination surface modeling

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Embodiment Construction

[0017] As we all know, due to changes in lighting conditions, the illuminance distribution in the shadow area is significantly different from that in the surrounding area with the same texture; under normal lighting conditions, the same texture area should have the same or asymptotically changing illumination distribution. According to this characteristic, the present invention starts from the angle of illumination correction, and uses the illuminated surface under normal illumination conditions to model the shadow area with the same texture, so as to obtain the energy distribution under normal illumination conditions in the shadow area, and finally through illumination correction Implements shadow removal for a single color image. The technical scheme of the present invention is described below:

[0018] 1. Color image decomposition

[0019] The purpose of color image decomposition is to extract its structural image and texture image from the original color image. The former...

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Abstract

The invention belongs to the computer image processing field and relates to a single color image shadow removal method based on illumination surface modeling. The method comprises the following steps: carrying out structure and texture decomposition on an original color shadow image and acquiring structure images in three color channels: R, G and B and corresponding texture images respectively; selecting central points uniformly in a non-shadowed region of the image and calculating a radial distance between any two central points; modeling the structure images in the three color channels respectively and acquiring illumination distribution of shadow regions in the three color channels; adding texture images in each channel to the three color channels respectively so as to obtain the image after illumination correction. The method of the invention has a strong adaptability. Too much manual interventions are not needed. The illumination modeling and central point selection adopt an adaptive algorithm. The method can be used for automatically removing the actual image shadow.

Description

technical field [0001] The invention belongs to the field of computer image processing and relates to a shadow removal method for a single color image. Background technique [0002] The shadow removal of a single color image is an important research content in the field of computer vision. Due to the existence of shadows, the local lighting conditions change, which in turn leads to changes in the color of the image, making image segmentation, target recognition, moving object detection and tracking, etc. The accuracy of the algorithm is limited to a great extent. [0003] To sum up, the current single image shadow removal methods can be roughly divided into three categories: methods based on physical models, methods based on features, and methods based on image extraction. Among them, 1) The method based on the physical model mainly analyzes the physical process of shadow generation, and with the help of some prior knowledge, establishes a shadow model, and on this basis ma...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 何凯张伟伟孔祥文孟春芝
Owner 天津渤化安创科技有限公司
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