US 11,696,038 B2 · Multiple camera color balancing

Abstract

Color and exposure matching for systems, such as a videoconferencing endpoint, that have overlapping camera fields of view. The geometric relationships between the overlapping cameras are used to determine correction processing. For each camera, histograms are developed for the overlapping cameras. A dynamic threshold is determined for each histogram. Using the dynamic threshold, peak detection is performed on each histogram. Using the geometric relationships, expected histogram relationships are determined. The actual histogram relationships are compared to the expected relationships, with further processing based on the correctness of the comparison. In some of the cases of further processing, peaks of the histograms are compared to find matching and non-matching peaks. Various ratios of pixels in the various peaks are used to determine needed changes to respective cameras. Incremental changes to camera outputs are provided and accumulated so that overall changes can be provided to adjust the output of the respective cameras.

Claims20

Dependent claims

A method for matching color and exposure of two overlapping cameras, the method comprising:

developing a first histogram of a frame of a first overlapping camera and a second histogram of a frame of a second overlapping camera;
determining peaks of the first histogram and the second histogram;
determining an assumed first and second histogram relationship;
determining an actual first and second histogram relationship;
categorizing the actual first and second histogram relationship to the assumed first and second histogram relationship into a category of a plurality of categories;
dependent on the category, analyzing the first and second histograms and develop needed changes to the two overlapping cameras;
and
providing the needed changes to allow correction of the first and second overlapping cameras.

5 more elements

A non-transitory processor readable memory containing instructions that when executed cause a processor or processors to perform the following method for matching color and exposure of two overlapping cameras, the method comprising:

developing a first histogram of a frame of a first overlapping camera and a second histogram of a frame of a second overlapping camera;
determining peaks of the first histogram and the second histogram;
determining an assumed first and second histogram relationship;
determining an actual first and second histogram relationship;
categorizing the actual first and second histogram relationship to the assumed first and second histogram relationship into a category of a plurality of categories;
dependent on the category, analyzing the first and second histograms and develop needed changes to the two overlapping cameras;
and
providing the needed changes to allow correction of the first and second overlapping cameras.

5 more elements

Dependencies are inferred from the claim text.

Multiple camera color balancing

Life of this patent

Multiple camera color balancing

Life of this patent

Abstract

Claims20