TY - JOUR T1 - Digital Image Compression by Outer Product Expansion JF - Communications, IEEE Transactions on Y1 - 1983 A1 - O'Leary, Dianne P. A1 - Peleg,S. KW - approximation; KW - coding; KW - image KW - Least-squares KW - Transform AB - 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. VL - 31 SN - 0090-6778 CP - 3 M3 - 10.1109/TCOM.1983.1095823 ER -