Patent ID: 9075757
Filing Date: 2015-07-07
Classification: G06F,H04N

Abstract:
1. An apparatus comprising: a 16-point discrete cosine transform of type II (DCT-II) unit that performs a plurality of DCTs-II of different sizes that transform content data from a spatial domain to a frequency domain, wherein the content data comprises one or more of image data and video data, wherein the plurality of DCTs of different sizes include internal factors selected such that each of the plurality of DCTs of different sizes satisfy an orthogonality property, wherein the internal factors are selected from a predetermined data set according to one or more of an approximation error, power efficiency, implementation complexity and a level of accuracy, wherein the 16-point DCT-II unit includes: an 8-point DCT-II unit that performs one of the plurality of DCTs-II of size 8; a first 4-point DCT-II unit that performs one of the plurality of DCTs-II of size 4, wherein the 8-point DCT-II unit includes the first 4-point DCT-II unit; and an 8-point DCT-IV unit comprising a second 4-point DCT-II unit and a third 4-point DCT-II unit, wherein each of the second and third 4-point DCT-II units performs one of the plurality of DCTs-II of size 4, wherein each of 4-point DCT-II units includes two of the internal factors with either preset integer values or preset dyadic rational values of a first same power of two, wherein the 8-point DCT-II includes four of the internal factors with either preset integer values or preset dyadic rational values of a second same power of two, and wherein the 8-point DCT-IV unit includes eight of the internal factors with either preset integer values or preset dyadic rational values of a third same power of two.