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US 9,432,648 B2Granted
Adaptive pal field comber
AssigneeSTMicroelectronics International N.V.
InventorRavi Ananthapurbacche
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Abstract
A video decoder includes an adaptive comber to generate a combed video image, and the adaptive comber selectively combs using 2D combing, frame combing, and field combing.
Claims23
A video decoder comprising:
- an adaptive comb configured to generate a combed video image from an image signal;
- and
- an adaptive comb controller comprising:
- at least one of a vertical image correlator and a spatio-temporal image correlator configured to generate an output signal representing at least one of a vertical image correlation value of the image signal and a spatio-temporal image correlation value of the image signal,
- a field motion detector configured to determine a field motion value as a function of field motion between adjacent fields of the combed video image and to, based thereupon, generate the output signal representing the field motion value;
- and
- controller logic configured to generate a control signal to cause the adaptive comb to selectively comb using 2D combing, frame combing, or field combing based upon the output signal;
- wherein the adaptive comb comprises at least one blender configured to receive signals from a frame comb and a field comb;
- wherein the at least one blender is configured to selectively combine the received signals dependent on the control signal;
- wherein the control signal causes the frame comb to process a region dependent on the spatio-temporal image correlator determining the field motion value to be less than a first motion threshold value;
- and
- wherein the control signal causes the field comb to process the region dependent on the spatio-temporal image correlator determining the field motion value to be indicative of motion, to be greater than the first motion threshold value, and to be less than a second motion threshold value.
9 more elements
A method of decoding video signals comprising:
- determining a chroma-luma status of a video signal, a vertical image correlation value of the video signal, and a spatio-temporal image correlation value and generating an output signal based thereupon;
- determining a field motion value as a function of field motion between adjacent fields of the combed video image and generating the output signal based thereupon;
- and
- selectively combing the video signal using 2D combing, frame combing, or field combing, based upon the output signal;
- wherein selectively combing comprises processing a region using the frame combing dependent on the field motion value to be less than a first motion threshold value;
- and
- wherein selectively combing further comprises processing the region using the field combing dependent on the field motion value being indicative of motion, being greater than the first motion threshold value, and being less than a second motion threshold value.
4 more elements
A video decoder, comprising:
- an adaptive comb configured to generate a combed video image;
- and
- an adaptive comb controller comprising:
- at least one of a chroma-luma status determiner, a vertical image correlator and a spatio-temporal image correlator configured to generate an output signal representing a characteristic of the video image, the characteristic being at least one of a chroma-luma status value of the video image, a vertical image correlation value of the video image, and a spatio-temporal image correlation value of the video image,
- a field motion detector configured to determine a field motion value as a function of field motion between adjacent fields of the combed video image;
- wherein the characteristic includes the field motion value;
- and
- a controller configured to, depending upon the characteristic of the video image, determine whether 2D combing, frame combing, or field combing is to be used, and to generate a control signal to cause the adaptive comb to comb using 2D combing, frame combing, or field combing based upon that determination;
- wherein the adaptive comb comprises at least one blender configured to receive signals from a frame comb and a field comb;
- wherein the at least one blender is configured to selectively combine the received signals dependent on the characteristic;
- wherein the controller is configured to cause the frame comb process a region dependent on the spatio-temporal image correlator determining the field motion value to be less than a first motion threshold value;
- and
- wherein the controller is configured to cause the field comb process the region dependent on the spatio-temporal image correlator determining the field motion value to be indicative of motion, to be greater than the first motion threshold value, and to be less than a second motion threshold value.
10 more elements
Dependencies are inferred from the claim text.