Method and circuit for correcting signals and image correcting method and circuit using the same
AssigneeNovatek Microelectronics Corp.
InventorMing-Feng Chiang
Life of this patent
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Abstract
A signal correcting method and a circuit thereof are provided. In the method, first, the values of a plurality of input signals are clamped to generate a plurality of corresponding clamping signals according to a plurality of adjustable predetermined values. Then, a combined multiplication operation is performed to the clamping signals according to the coefficients in a matrix obtained by multiplying the coefficients in at least two predetermined correcting matrixes, so as to output a plurality of results. Next, the results are respectively clamped according to a plurality of corresponding predetermined thresholds so as to output the corrected input signals.
Claims19
A signal correcting method, adapted to a signal correcting circuit and suitable for executing a combined multiplication operation, wherein the combined multiplication operation comprises at least a plurality of multiplication parameters, and a combined multiplication parameter is obtained by multiplying the multiplication parameters, the signal correcting method comprising:
- performing a pre-clamping step by an input clamp apparatus of the signal correcting circuit, for clamping the values of a plurality of input signals according to a plurality of adjustable predetermined values, so as to generate a plurality of corresponding clamping signals, wherein the adjustable predetermined values are obtained by dividing maximum values corresponding to a bit number of output signals by gain coefficients;
- performing a combined multiplication operation to each of the clamping signals according to the combined multiplication parameter by a combined multiplication apparatus of the signal correcting circuit, so as to output a plurality of results;
- and
- respectively clamping the results according to a plurality of corresponding predetermined thresholds by an output clamp apparatus of the signal correcting circuit so as to output the corrected input signals.
An image correcting method, adapted to a signal correcting circuit and suitable for executing a combined multiplication operation, wherein the combined multiplication operation comprises at least a plurality of multiplication parameters, and a combined multiplication parameter is obtained by multiplying the multiplication parameters, the image correcting method comprising:
- performing a pre-clamping step by an input clamp apparatus of the signal correcting circuit, for clamping the values of a plurality of image input signals according to a plurality of adjustable predetermined values so as to generate a plurality of corresponding clamping signals, wherein the adjustable predetermined values are obtained by dividing maximum values corresponding to a bit number of the image output signals by gain coefficients;
- performing a combined multiplication operation to each of the clamping signals according to the combined multiplication parameter by a combined multiplication apparatus of the signal correcting circuit, so as to output a plurality of results;
- and
- respectively clamping the results according to a plurality of corresponding predetermined thresholds by an output clamp apparatus of the signal correcting circuit so as to output the corrected image input signals.
A signal correcting circuit, comprising:
- an input clamp apparatus, for receiving a plurality of input signals and respectively clamping the values of the input signals according to a plurality of corresponding adjustable predetermined values so as to output a plurality of clamping signals, wherein the adjustable predetermined values are obtained by dividing maximum values corresponding to a bit number of output signals by gain coefficients;
- a combined multiplication apparatus, performing a combined multiplication operation to the clamping signals according to a combined multiplication parameter so as to output a plurality of results, wherein at least a plurality of multiplication parameters is used in the combined multiplication operation, and the combined multiplication parameter is obtained by multiplying the multiplication parameters;
- and
- an output clamp apparatus, respectively clamping the results according to a plurality of predetermined thresholds so as to output the corrected input signals.
An image correcting circuit, comprising:
- an input clamp apparatus, for receiving a plurality of image input signals and respectively clamping the values of the image input signals according to a plurality of corresponding adjustable predetermined values so as to output a plurality of clamping signals, wherein the adjustable predetermined values are obtained by dividing maximum values corresponding to a bit number of the image output signals by gain coefficients;
- a combined multiplication apparatus, performing a combined multiplication operation to the clamping signals according to a combined multiplication parameter so as to output a plurality of results, wherein at least a plurality of multiplication parameters is used in the combined multiplication operation, and the combined multiplication parameter is obtained by multiplying the multiplication parameters;
- and
- an output clamp apparatus, respectively clamping the results according to a plurality of predetermined thresholds so as to output the corrected image input signals.
Dependencies are inferred from the claim text.