Local area linear dynamic range compression

Details Local area linear dynamic range compression Local area linear dynamic range compression

1995-08-28

2000-07-18

Couso, Yon J.

Image analysis

Image compression or coding

382169, G06K 936

Patent

active

060918535

ABSTRACT:
A 12 bit to 8 bit dynamic range compression processor for compressing video data. The dynamic range compression processor uses a lookup RAM, or dynamic range compression RAM, to update offset and compression terms of each field of video in real time. During the active video period of each field, a 12 bit histogram of video pixel values is collected using a histogram RAM for a specific software defined local area of interest. During the video scan retrace time, the histogram is evaluated and offset and compression terms are computed based on upper and lower breakpoints of the histogram. An algorithm is employed to generate one of 3840 (15 integer and 3825 non-integer) compression slopes. Each compression slope is written into the dynamic range compression RAM starting at the computed offset value and is applied to the next field of video.

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