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Method for carrying out global color calibration on a plurality of video cameras

A color calibration, camera technology, applied in the field of computer multimedia, can solve the problem that the color consistency of the camera cannot be guaranteed

Active Publication Date: 2011-01-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for non-planar camera arrays, only individual cameras can be color calibrated individually, or cameras can be calibrated in groups based on visibility
Therefore, this method can only guarantee the color consistency between the cameras in the group at best, but not the color consistency of all cameras

Method used

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  • Method for carrying out global color calibration on a plurality of video cameras
  • Method for carrying out global color calibration on a plurality of video cameras
  • Method for carrying out global color calibration on a plurality of video cameras

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Embodiment Construction

[0030] A kind of method that the present invention carries out global color calibration to a plurality of video cameras, comprises the following steps:

[0031] (1) Place the color calibration object at the center of the scene so that N cameras are aimed at the center of the scene. The color calibration object is a cylindrical surface with x rows and y columns of color blocks evenly distributed on the cylindrical surface, and each row of color blocks The colors between the color blocks on the column are the same, and the colors between the color blocks on each column of color blocks are different;

[0032] (2) Make N cameras collect an image of the color calibration object in the center of the scene at the same time;

[0033] (3) For each of the images collected above, use the scale-invariant feature transformation method to detect feature points, take the detected feature points as the center, and intercept the size of r 1 ×r 1 The pixel block, judge whether the color in th...

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Abstract

The method relates to a method for carrying out the global color calibration on a plurality of video cameras, belonging to the field of computer multimedia technologies. A calibrant is placed in the center of a scene, and N video cameras acquire an image from the calibrant in the center of the scene. The color calibration process comprises the following steps: calculating global correspondences of all video cameras by applying a feature point detection method and relevant methods based on areas; establishing overdetermined linear equations based on the color consistency and the dynamic range constraint; and setting the obtained calibration parameters into all video cameras. The calibrant used in the method is simple, flexible and convenient for carrying; the color calibration process has simple algorithm routines, is easy to realize and fully automatic; and the color calibration merges the feature point detection method and the relevant methods based on areas together, thereby obtaining the high-precision global correspondences. The calibrant in the method and the color calibration method can be applied to any multi-video-camera array system, thereby achieving the color consistency and the high-contrast calibration of all cameras.

Description

technical field [0001] The invention relates to a method for global color calibration of multiple cameras, belonging to the technical field of computer multimedia. Background technique [0002] In computer vision, for many applications based on multi-view images, such as optical flow and 3D reconstruction, accurate color is not the most important thing, the most important thing is the color consistency between cameras, so as to facilitate accurate matching. The act of ensuring color consistency between cameras in a camera array is called color calibration. [0003] Although there are already some standard geometric calibration methods for large-scale camera arrays in the world, little attention has been paid to the color calibration of large-scale camera arrays. A commonly used method is to adjust the camera's gain and white balance with the help of a standard color calibration board (Gretagmacbeth color management solutions, http: / / www.gretagmacbeth.com.). This approach i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N17/00G06T7/00
Inventor 戴琼海李坤徐文立
Owner TSINGHUA UNIV
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