Content-dependent scan rate converter with adaptive noise reduction

An apparatus for content-dependent interlaced video to progressive video conversion with adaptive noise reduction, said apparatus comprising:

• a temporal noise reduction and low-pass filter to receive said interlaced video;
• first and second field delay buffers being coupled sequentially to the output of said temporal noise reduction and low-pass filter;
• a first difference amplifier operatively coupled to receive said input interlaced video and output from said second field delay buffer;
• a first non-linear filter coupled to the output of said first difference amplifier;
• the output of said first non-linear filter operatively coupled in parallel to the input of a median filter and the input of a 3×3 low-pass filter;
• the output of said low-pass filter and a first output of said median filter coupled to first and second inputs of a multiplexer;
• a second noise filter select output from said median filter coupled to a third input of said multiplexer;
• the output of said multiplexer coupled to a noise detection circuit, the output of said circuit being a 4-bit absolute number;
• the output of said 4-bit noise detection circuit coupled to the input to a 5-pixel by 3-line spatial maximum filter;
• the output of said spatial maximum filter coupled to a first input of a 5-pixel by 7-line spatial-temporal maximum filter and to the input of a third field delay buffer;
• the output of said third delay buffer coupled to a second input of said 5-pixel by 7-line temporal maximum filter;
• the output of said 5-pixel by 7-line temporal maximum filter coupled to the input of a second non-linear output filter;
• and
• the output of said second non-linear filter operatively coupled to one input of a new field multiplexer.

A projection display system having content-dependent scan rate converter video with adaptive noise reduction, comprising:

• a first output of a projection system controller coupled to up to three spatial light modulator devices;
• a second output of said projection system controller coupled to a lamp power supply, said power supply controlling the brightness of said lamp;
• white light from said lamp being process and focusing red, green, blue light on the surface of respective spatial light modulators;
• said spatial light modulators, under control of said projection system controller, modulating said red, green, blue light, said modulated light being projected from surfaces of ON pixels of said spatial light modulators into a projection lens;
• light from surfaces of OFF pixels of said spatial light modulator being reflected into a light trap;
• magnified light from said projection being focused on to a viewing screen;
• an interlaced video source being supplied to a content-dependent scan rate converter with adaptive noise reduction capability, said video being processed on a pixel-by-pixel basis and supplied as progressive video to the input of said projection system controller.