发明授权
US06813391B1 System and method for exposure compensation 有权
曝光补偿的系统和方法

System and method for exposure compensation
摘要:
A system and method for adjusting exposure in a mosaiced or stitched image. A stitched composite image is typically represented by a set of images and a set of associated transformations. Each transformation corresponds to one image in the input image sequence and represents the mapping between image pixels in each image and a three-dimensional coordinate system. Every triplet of images in the mosaiced image, having a first, center and third image, is input into the system and method according to the present invention. Before exposure adjustment can be performed, the regions of overlap between the input images in the mosaiced image are calculated. Once the areas of overlap associated with the first and third images are found, the areas of overlap associated with these images are warped to the coordinate frame of the center image. This allows the corresponding pixel locations in the first and center images, and the corresponding pixel location in the third and center images to be determined for the overlapping areas. Additionally, the luminance of each pixel in these areas is identified. The exposure correction factors for each overlapping area are then calculated. Once the exposure correction factors for each overlapping area are calculated, the luminance of all pixels in the center image are adjusted using these factors to yield a mosaiced image that appears to be consistent in exposure. This process is repeated until all sets of triplets have been considered.
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