Patent ID: 6424750
Filing Date: 2002-07-23
Classification: H04N

Abstract:
An apparatus including a digital data buffer and filter for selectively storing image pixel data, combining new incoming image pixel data with previously stored image pixel data and providing such combined image pixel data for display thereof in a still image mode or an image motion mode, comprising:a data scaling and summing circuit configured to receive and scale an input data signal, receive and scale a stored data sum signal and sum said scaled input data signal and said scaled stored data sum signal and in accordance therewith provide a data sum signal, wherein said input data signal is scaled in accordance with a first scaling factor and said stored data sum signal is scaled in accordance with a second scaling factor, and wherein said input data signal includes a plurality of successive sets of image data, and further wherein each one of said plurality of successive sets of image data includes a plurality of pixel data with active and inactive data states and which corresponds to a two-dimensional image having a two-dimensional array including a plurality of rows and a plurality of columns of pixels which together correspond to said two-dimensional image and which individually correspond to respective portions of said two-dimensional image; and a data memory circuit, coupled to said data scaling and summing circuit, configured to receive and selectively store said data sum signal and in accordance therewith provide said stored data sum signal; wherein said data scaling and summing circuit and said data memory circuit cooperatively operate in one of a plurality of operational modes during said reception of said input data signal; wherein, in a first one of said plurality of operational modes, said first scaling factor has a value which is between zero and unity, and said second scaling factor has a value which equals a difference between unity and said first scaling factor value; and wherein, in a second one bf said plurality of operational modes, said first scaling factor has a value which is initially unity when a first one of said plurality of successive sets of image data is in said inactive data state, remains unity when a subsequent second one of said plurality of successive sets of image data is in said active data state and becomes zero when a further subsequent third one of said plurality of successive sets of image data is in said inactive data state, and said second scaling factor has a value which is initially zero, becomes unity when said subsequent second one of said plurality of successive sets of image data is in said active data state and remains unity thereafter.