Patent ID: 6697533
Filing Date: 2004-02-24
Classification: G06T

Abstract:
A filtering circuit for performing a high pass filtering and a low pass filtering on a plurality of input image data to obtain a high frequency component and a low frequency component corresponding to a current input image data, said filtering circuit comprising:a first latch for holding the input image data and outputting the same; a first adder for performing an addition between a previous input image data and a previous second input image data in a first operating cycle to obtain a first operation value, and performing an addition between the first operation value and a current input image data in a second operating cycle to obtain a high frequency component; a second latch for holding the first operation value and the high frequency component from the first adder and outputting the same; a second adder for performing an addition between a previous second high frequency component output from the second latch and the previous second input image data in the first operating cycle to obtain a second operation value, and performing an addition between the second operation value and a current high frequency component obtained in the first adder in the second operating cycle to obtain a low frequency component; and a third latch for holding the second operation value and outputting the same.