Video preprocessing method and apparatus with selective filterin

Details Video preprocessing method and apparatus with selective filterin Video preprocessing method and apparatus with selective filterin

1996-07-16

2000-03-14

Rao, Andy

Television

Bandwidth reduction system

Data rate reduction

348411, 348413, 348415, 348416, 348699, H04N 718

Patent

active

060379863

ABSTRACT:
Video preprocessing methods and apparatus which utilize motion detection to control selective filtering of pels in a sequence of video frames wherein a video preprocessor generates first and second motion metrics for a given pel in a current frame N by taking the difference between the given pel and corresponding pels in a previous frame N-1 and a subsequent frame N+1, respectively. The motion metrics are converted to first and second bitmaps by thresholding the motion metric value against a first threshold. A motion detection metric is then generated for a given pel by summing the values of the first and second bitmaps for a group of pels which includes the given pel, and comparing the result to a predetermined threshold. The group of pels may include five pels on each of two lines above the given pel, and five pels on each of two lines below a given pel. The motion detection metric may be used to determine whether or not temporal median filtering and/or temporal lowpass filtering operations should be applied to the given pel. The motion detection metric may also be used in conjunction with an edge detection metric and a frame-wise motion activity measure to generate an address into a look-up table. The look-up table specifies a set of filter coefficients for use in a spatial lowpass filtering operation applied to the given pel.

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patent: 4853775 (1989-08-01), Rouvrais et al.
patent: 5384865 (1995-01-01), Loveridge
patent: 5483288 (1996-01-01), Hong
patent: 5561477 (1996-10-01), Polit
patent: 5691775 (1997-11-01), Astle

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