Video signal processing stripe color demodulator system and method
AssigneeInternational Business Machines Corporation
InventorAlbert D. Edgar
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Abstract
An image is captured into a video signal by an array sensor with color stripes. The system first interprets the highest frequencies of the signal as an upper sideband of the I color component so as to double the recoverable bandwidth of color detail. From the upper sideband of the signal, the corresponding lower color sideband is predicted and its effect is then subtracted from the luminance component, from which, in turn, an image is generated. The resulting image is enhanced in sharpness and has fewer artifacts. Color may be demodulated from sensor signal and the predominant I color vector demodulated from the color carrier utilizing an asymmetric sideband filter.
Claims44
A method for demodulating color from a striped array sensor signal comprising:
- capturing an image with a striped array sensor in a video signal having upper and lower sidebands and a color carrier with a predominant I color vector;
- and
- demodulating said I color vector from said color carrier with an asymmetric sideband filter.
A method for processing a striped array signal having a color carrier frequency (Fcc) and Y, Q, I components from an array defining a Nyquist frequency Fn, comprising the steps of:
- low pass filtering said array signal to generate a first signal;
- sampling said first signal to generate a second signal;
- low pass filtering said second signal to generate a modified Y component of said array signal;
- demodulating said second signal to generate a third signal;
- low pass filtering said third signal to generate a modified Q component of said array signal;
- generating a fourth signal comprised of the difference between said first signal and said modified Y component;
- sampling said fourth signal to generate samples comprising a fifth signal;
- demodulating said fifth signal to generate a sixth signal;
- and
- low pass filtering said sixth signal to generate a modified I component of said array signal.
An apparatus for demodulating color from a striped array sensor signal generated from a striped array sensor comprising:
- means for capturing an image with said striped array sensor in a video signal having upper and lower sidebands and a color carrier with a predominant I color vector;
- and
- means interconnected to said means for capturing for demodulating said I color vector from said color carrier with an asymmetric sideband filter.
Apparatus for processing a striped array signal having a color carrier frequency (Fcc=1) and Y, Q, I components from an array defining a Nyquist frequency Fn, comprising:
- means for low pass filtering said array signal to generate a first signal;
- means for sampling said first signal to generate a second signal;
- means for low pass filtering said second signal to generate a modified Y component of said array signal;
- means for demodulating said second signal to generate a third signal;
- means for low pass filtering said third signal to generate a modified Q component of said array signal;
- means for generating a fourth signal comprised of the difference between said first signal and said modified Y component;
- means for sampling said fourth signal to generate samples comprising a fifth signal;
- means for demodulating said fifth signal to generate a sixth signal;
- and
- means for low pass filtering said sixth signal to generate a modified I component of said array signal.
Dependencies are inferred from the claim text.