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An EPLD/MPLD usually comprises programmable RAM and this forms the line memories for temporary storage of the data being compared, and for the determination of the coordinates of the picture. In addition, the EPLD/MPLD provides means for integrating over all luminance values in the window being detected to determine the display load. This indicates whether the picture is video or photographic material (sufficient colors should be present) and will determine the enhancement factor and whether enhancement is to be implemented.
The EPLD/MPLD communicates with a microprocessor in which the intelligence is located to select the required window from the data processed in the EPLD and to determine the gain factor. The required gain is then supplied to video amplifiers to enhance the input video signal RGB as required.
The incoming video signal RGB may alternatively be converted to a luminance signal and then converted to a digital luminance stream for processing via the EPLD and microprocessor.
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