Invention Grant
US08478076B2 Alignment of digital images and local motion detection for high dynamic range (HDR) imaging 有权
数字图像的对准和用于高动态范围(HDR)成像的局部运动检测

Alignment of digital images and local motion detection for high dynamic range (HDR) imaging
Abstract:
Image alignment operations particular suited for High Dynamic Range (HDR) image generation are described. Image pyramids may be generated using reference and source images. Difference bitmaps, based on a number of pixel shift combinations in the x and y directions, can be divided into tiles and analyzed and, for each pyramid level, an optimal shift direction determined. The tiles can then be pruned using a threshold such that only those tiles contributing up to the threshold are projected to a subsequent pyramid level. The alignment vector for each level can be aggregated to determine a final alignment vector which can be used to shift the source image. This process may be repeated for another source image, and the two source images and reference image, once aligned, may be merged to generate an HDR image.
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