Video noise reduction apparatus and method using three dimensional discrete cosine transforms and noise measurement.

摘要

The method of processing a first video signal having a noise component to produce a second signal with the noise component reduce, involves taking corresp. data samples in a number of frames of the first video signal to produce three dimensional (3-D) blocks of time spatial samples. The 3-D blocks are transformed to produce 3-D blocks of time frequency spectrum coeffts. of the first video signal. From selected segments of the 3-D time frequency spectrum coefft. blocks, a 3-D block is generated of time frequency spectrum coeffts. of the noise component. The blocks of time frequency spectrum coeffts. are modified w.r.t. the time frequency spectrum coefft. blocks of the noise component to produce modified blocks which represent the second video signal. The modified 3-D blocks which represent the second video signal are transformed to produce corresp. 3-D blocks of data samples in a number of frames of the second signal.