Patent ID: 8045612
Filing Date: 2011-10-25
Classification: H04N

Abstract:
1. A method of computing an inverse integer transform from a matrix of coefficients derived by decoding a signal, said method comprising: determining from said decoding an ordered progression of indexed locations in said matrix, and an index value corresponding to a highest-indexed location in said matrix that contains a predefined coefficient; when said index value is in a first range of values, above an upper threshold, computing said inverse integer transform using a first group of operations; when said index value is in a second range of values, between a lower threshold and said upper threshold, computing said inverse integer transform using a second group of operations, said second group of operations being less complex than said first group of operations; and when said index value is in a third range of values below said lower threshold, computing said inverse integer transform using a third group of operations, said third group of operations being less complex than said second group of operations.