Noise removal device, noise removal method, and computer readable recording medium
First Claim
Patent Images
1. A noise removal device that removes noise from an image signal, comprising:
- a separation unit that separates the image signal into at least two subband signals;
a noise estimation unit that estimates a noise amount of a pixel of at least one of the subband signals;
a parameter setting unit that sets a plurality of coring ranges in relation to at least one of the subband signals, the coring ranges being ranges of signal values of subband signals to be subjected to coring processing within the subband signals; and
a coring unit that performs the coring processing on the at least one of the subband signals based on the plurality of coring ranges;
wherein the parameter setting unit includes a color difference/color sum calculation unit that calculates at least one of a color difference and a color sum using signal values in a region within the at least one of the subband signals;
wherein the parameter setting unit adjusts the plurality of coring ranges based on the noise amount and the at least one of the color difference and the color sum;
wherein the parameter setting unit sets a first fixed output value for a first coring range in the plurality of coring ranges in relation to the at least one of the subband signals, and sets a second fixed output value for a second coring range in the plurality of coring ranges in relation to the at least one of the subband signals; and
wherein the coring unit;
transforms signal values belonging to the first coring range within the at least one of the subband signals into the first fixed output value,transforms signal values belonging to the second coring range within the at least one of the subband signals into the second fixed output value, andcorrects signal values that do not belong to any one of the plurality of coring ranges in relation to the at least one of the subband signals.
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Abstract
A noise removal device that removes noise from an image signal includes: a separation unit that separates the image signal into at least two subband signals; a parameter setting unit that sets a plurality of coring ranges in relation to at least one of the subband signals; and a coring unit that performs coring processing on the basis of the plurality of coring ranges.
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Citations
11 Claims
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1. A noise removal device that removes noise from an image signal, comprising:
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a separation unit that separates the image signal into at least two subband signals; a noise estimation unit that estimates a noise amount of a pixel of at least one of the subband signals; a parameter setting unit that sets a plurality of coring ranges in relation to at least one of the subband signals, the coring ranges being ranges of signal values of subband signals to be subjected to coring processing within the subband signals; and a coring unit that performs the coring processing on the at least one of the subband signals based on the plurality of coring ranges; wherein the parameter setting unit includes a color difference/color sum calculation unit that calculates at least one of a color difference and a color sum using signal values in a region within the at least one of the subband signals; wherein the parameter setting unit adjusts the plurality of coring ranges based on the noise amount and the at least one of the color difference and the color sum; wherein the parameter setting unit sets a first fixed output value for a first coring range in the plurality of coring ranges in relation to the at least one of the subband signals, and sets a second fixed output value for a second coring range in the plurality of coring ranges in relation to the at least one of the subband signals; and wherein the coring unit; transforms signal values belonging to the first coring range within the at least one of the subband signals into the first fixed output value, transforms signal values belonging to the second coring range within the at least one of the subband signals into the second fixed output value, and corrects signal values that do not belong to any one of the plurality of coring ranges in relation to the at least one of the subband signals. - View Dependent Claims (2, 3, 4, 5)
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6. A noise removal method for removing noise from an image signal, the method comprising:
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separating the image signal into at least two subband signals; estimating a noise amount of a pixel of at least one of the subband signals; setting a plurality of coring ranges in relation to at least one of the subband signals, the coring ranges being ranges of signal values of subband signals to be subjected to coring processing within the subband signals; and performing the coring processing on the at least one of the subband signals based on the plurality of coring ranges; wherein the setting comprises; calculating at least one of a color difference and a color sum using signal values in a region within the at least one of the subband signals; adjusting the plurality of coring ranges based on the noise amount and the at least one of the color difference and the color sum; and setting (i) a first fixed output value for a first coring range in the plurality of coring ranges in relation to the at least one of the subband signals, and (ii) a second fixed output value for a second coring range in the plurality of coring ranges in relation to the at least one of the subband signals; and wherein the coring comprises; transforming signal values belonging to the first coring range within the at least one of the subband signals into the first fixed output value, transforming signal values belonging to the second coring range within the at least one of the subband signals into the second fixed output value, and correcting signal values that do not belong to any one of the plurality of coring ranges in relation to the at least one of the subband signals. - View Dependent Claims (7, 8, 9, 10)
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11. A non-transitory computer readable storage medium having a program stored thereon, the program causing a computer to execute a method for removing noise from an image signal, the method comprising:
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separating the image signal into at least two subband signals; estimating a noise amount of a pixel of at least one of the subband signals; setting a plurality of coring ranges in relation to at least one of the subband signals, the coring ranges being ranges of signal values of subband signals to be subjected to coring processing within the subband signals; and performing the coring processing on the at least one of the subband signals based on the plurality of coring ranges; wherein the setting comprises; calculating at least one of a color difference and a color sum using signal values in a region within the at least one of the subband signals; adjusting the plurality of coring ranges based on the noise amount and the at least one of the color difference and the color sum; and setting (i) a first fixed output value for a first coring range in the plurality of coring ranges in relation to the at least one of the subband signals, and (ii) a second fixed output value for a second coring range in the plurality of coring ranges in relation to the at least one of the subband signals; and wherein the coring comprises; transforming signal values belonging to the first coring range within the at least one of the subband signals into the first fixed output value, transforming signal values belonging to the second coring range within the at least one of the subband signals into the second fixed output value, and correcting signal values that do not belong to any one of the plurality of coring ranges in relation to the at least one of the subband signals.
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Specification