Patent ID: 7792375
Filing Date: 2010-09-07
Classification: H04N

Abstract:
1. A rate control system including a processor for controlling a rate of compressed image data, comprising: an image quality controller configured to, in compressed image data compressed by recursively dividing an image signal into high- and low-pass components using a wavelet transform to calculate transform coefficients in a plurality of bandpass components and entropy coding said transform coefficients, bit shift each of said plurality of bandpass components by a number of bits corresponding to a priority set based on a norm of 2-D synthesis filter coefficients of a predetermined bandpass component among said plurality of bandpass components and according to a number of recursive divisions, and select a target scanning area to be coded, based on a target image quality parameter, from said plurality of bandpass components that have been bit shifted, prior to generating a coded bit stream using the transform coefficients.