System and method for camera color calibration and image stitching
First Claim
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1. A process for color calibrating a series of cameras capturing different portions of the same scene, comprising the following process actions:
- selecting a reference camera from a series of cameras configured to capture different portions of a scene;
calibrating said reference camera to optimum color settings for capturing portions of said scene by setting the reference camera for optimum brightness by adjusting a mean intensity of the scene until it reaches a value corresponding to a black reference value,wherein the black reference value is determined by a black reference pixel region in the camera, and wherein the optimum brightness is adjusted so that the mean black reference pixel region eauals the black reference value, andwherein the black reference value is equal to two times the standard deviation of the pixels of the black reference pixel region; and
propagating the optimum color settings from the reference camera to all other cameras in the series for regions of camera overlap.
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Abstract
A practical, real-time calibration of digital omnidirectional cameras in the areas of de-vignetting, brightness, contrast, and white balance control. Novel solutions for the color calibration of an omnidirectional camera rig, and an efficient method for devignetting images are presented. Additionally, a context-specific method of stitching images together into a panorama or a mosaic is provided.
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Citations
9 Claims
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1. A process for color calibrating a series of cameras capturing different portions of the same scene, comprising the following process actions:
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selecting a reference camera from a series of cameras configured to capture different portions of a scene; calibrating said reference camera to optimum color settings for capturing portions of said scene by setting the reference camera for optimum brightness by adjusting a mean intensity of the scene until it reaches a value corresponding to a black reference value, wherein the black reference value is determined by a black reference pixel region in the camera, and wherein the optimum brightness is adjusted so that the mean black reference pixel region eauals the black reference value, and wherein the black reference value is equal to two times the standard deviation of the pixels of the black reference pixel region; and propagating the optimum color settings from the reference camera to all other cameras in the series for regions of camera overlap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification