ImagePyramidApply
ImagePyramidApply[f, pyr] applies f to all images in the ImagePyramid object pyr.
ImagePyramidApply[f, {pyr1, pyr2, ...}]applies f to the sequence of corresponding levels taken from each pyri.
Examples
pyr = ImagePyramid[ExampleData[{"TestImage", "Lena"}]];
ImagePyramidApply[ColorNegate, pyr]ImagePyramidApply[ImageAdjust, pyr]Please visit the official Wolfram Language Reference for more details.