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Color image vignetting recovery method based on illumination surface modeling

A color image and surface modeling technology, which is applied in image enhancement, image analysis, image data processing, etc., can solve problems such as limited applications, and achieve the effects of improving accuracy, easy implementation, and reducing the condition number

Active Publication Date: 2014-02-05
天津渤化讯创科技有限公司
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Problems solved by technology

This method needs to use the standard image to obtain the image vignetting function comparison table in advance, and each shot must meet the same conditions, which also greatly limits its application in practical engineering

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  • Color image vignetting recovery method based on illumination surface modeling
  • Color image vignetting recovery method based on illumination surface modeling
  • Color image vignetting recovery method based on illumination surface modeling

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Embodiment Construction

[0015] As we all know, under the same lighting conditions, the illuminance distribution in the same texture area should satisfy the characteristics of asymptotic change. However, most actual images are composed of different textures. Due to the difference in reflection coefficient, even under the same lighting conditions , the illumination surface distribution of different textures will also be distorted, so the overall illumination distribution of the image cannot be obtained by modeling the entire image illumination surface.

[0016] It is worth noting that almost all natural images are composed of foreground and background regions. No matter how complex the foreground region is, its background region is often composed of a single texture. That is to say, most images in the background region The illuminance distribution can meet the characteristics of asymptotic change. Therefore, the present invention intends to select the relevant center point from the background area with...

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Abstract

The invention belongs to the computer image processing field and relates to a color image vignetting recovery method based on illumination surface modeling. The method comprises the following steps: converting an original color vignetting image into an HSI space; extracting foreground and background regions of the vignetting image; using a color image decomposition technology to realize the decomposition of a structure and a texture of the original color vignetting image and acquire a color structure image, and converting the color structure image into the HSI space; in the background region of the image, selecting central points according to an uniformity principle; calculating a radial distance between any two central points; modeling all the points to be modeled and acquiring a curved surface after the modeling; taking the curved surface acquired through modeling as a vignetting function so as to acquire the color image after the vignetting recovery. The method of the invention has a good adaptability and is easy to be realized in a real project.

Description

technical field [0001] The invention belongs to the field of computer image processing, and relates to a vignetting restoration method of a color image. Background technique [0002] When the camera is imaging at a long distance, as the field of view increases, the cross-sectional area of ​​the oblique beam that can be imaged by the photographic objective lens will gradually decrease, which will cause the image to appear bright in the middle and dark at the edge, which is the vignetting phenomenon. The existence of vignetting will lead to changes in image lighting conditions, which will greatly reduce the accuracy of algorithms such as target detection, image registration, and image fusion. Important research content has important research significance and practical application value. [0003] Obtaining the correct vignetting function is the key to realize image vignetting restoration. The traditional image vignetting restoration method usually calculates the vignetting fu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T7/00
Inventor 何凯孔祥文张伟伟王伟
Owner 天津渤化讯创科技有限公司
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