Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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: 2010-02-17
TSINGHUA UNIV
View PDF0 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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 ofall 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 consistencyand 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04N17/00G06T7/00
Inventor 戴琼海李坤徐文立
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com