METODO Y APARATO PARA AJUSTAR EL CONTRASTE DE UNA IMAGEN.

摘要

A method and apparatus for adjusting the contrast of an input image (11) is disclosed. Brightness level data of the input image (11) is filtered (12) to obtain at least a low frequency component and a high frequency component. The high frequency component is amplified (14,15). The low frequency component and the amplified high frequency component are summed (16) to produce brightness level data of the output image (17). The filtering is carried out by at least one recursive infinite impulse response filter (21,22) having a single delay coefficient that is adaptive to areas of high contrast in the input image (11).