If the drop size is sufficiently small not all output pixels will have data added to them from each input image. The value of an input pixel is averaged into an output pixel with a weight proportional to the area of overlap between the “drop” and the output pixel. The new shrunken pixels, or “drops”, rain down upon the sub-sampled output. However, in order to avoid re-convolving the image with the large pixel “footprint” of the camera, drizzle allows the user to shrink the pixel before it is averaged into the output image. Pixels in the original input images are mapped into pixels in the subsampled output image, taking into account shifts and rotations between images and the optical distortion of the camera.
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