@article {15742, title = {Digital Image Compression by Outer Product Expansion}, journal = {Communications, IEEE Transactions on}, volume = {31}, year = {1983}, month = {1983/03//}, pages = {441 - 444}, abstract = {We approximate a digital image as a sum of outer products dxyTwheredis a real number but the vectorsxandyhave elements +1, -1, or 0 only. The expansion gives a least squares approximation. Work is proportional to the number of pixels; reconstruction involves only additions.}, keywords = {approximation;, coding;, image, Least-squares, Transform}, isbn = {0090-6778}, doi = {10.1109/TCOM.1983.1095823}, author = {O{\textquoteright}Leary, Dianne P. and Peleg,S.} }