Signal processing device, control method for signal processing device, control program, and computer-readable storage medium having the control program recorded therein
First Claim
1. A signal processing device which carries out a process for sharpening an image with respect to an input signal representing the image, so as to output an output signal representing the image which has been sharpened,said signal processing device comprising:
- frequency component decomposition means for decomposing the input signal into a plurality of frequency components in different frequency ranges;
higher harmonic wave generating means for generating a higher harmonic wave for each of a part or all of frequency components obtained by removing a frequency component in the lowest frequency range from frequency components into which the frequency component decomposition means has decomposed; and
output signal generating means for composing (i) the higher harmonic wave generated by the higher harmonic wave generating means and (ii) a frequency component for which no higher harmonic wave has been generated by the higher harmonic wave generating means of the frequency components into which the frequency component decomposition means has decomposed, so as to generate the output signal,the higher harmonic wave generating means including;
nonlinear process means for generating a nonlinear process signal (i) in which positive and negative signs of a frequency component for which the higher harmonic wave is to be generated are retained and (ii) which broadly monotonically increases nonlinearly with respect to the frequency component when the frequency component is located at least in the vicinity of 0 (zero); and
addition means for adding the nonlinear process signal to the frequency component, so as to generate the higher harmonic wave.
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Abstract
A signal processing device first decomposes an input signal into a plurality of frequency components in different frequency ranges, then causes a higher harmonic wave generating section to generate a higher harmonic for each of a part or all of frequency components obtained by removing a frequency component in the lowest frequency range from frequency components obtained by the decomposition, and finally composes (i) the higher harmonic thus generated and (ii) a frequency component for which no higher harmonic has been generated. The higher harmonic wave generating section adds the frequency component and a nonlinear process signal (i) in which positive and negative signs of a frequency component for which the higher harmonic is to be generated are retained and (ii) which broadly monotonically increases nonlinearly with respect to the frequency component when the frequency component is located at least in the vicinity of zero.
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Citations
17 Claims
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1. A signal processing device which carries out a process for sharpening an image with respect to an input signal representing the image, so as to output an output signal representing the image which has been sharpened,
said signal processing device comprising: -
frequency component decomposition means for decomposing the input signal into a plurality of frequency components in different frequency ranges; higher harmonic wave generating means for generating a higher harmonic wave for each of a part or all of frequency components obtained by removing a frequency component in the lowest frequency range from frequency components into which the frequency component decomposition means has decomposed; and output signal generating means for composing (i) the higher harmonic wave generated by the higher harmonic wave generating means and (ii) a frequency component for which no higher harmonic wave has been generated by the higher harmonic wave generating means of the frequency components into which the frequency component decomposition means has decomposed, so as to generate the output signal, the higher harmonic wave generating means including; nonlinear process means for generating a nonlinear process signal (i) in which positive and negative signs of a frequency component for which the higher harmonic wave is to be generated are retained and (ii) which broadly monotonically increases nonlinearly with respect to the frequency component when the frequency component is located at least in the vicinity of 0 (zero); and addition means for adding the nonlinear process signal to the frequency component, so as to generate the higher harmonic wave. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17)
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15. A method for controlling a signal processing device which carries out a process for sharpening an image with respect to an input signal representing the image, so as to output an output signal representing the image which has been sharpened,
said method comprising the steps of: -
(a) decomposing the input signal into a plurality of frequency components in different frequency ranges; (b) generating a higher harmonic wave for each of a part or all of frequency components obtained by removing a frequency component in the lowest frequency range from frequency components into which the step (a) has decomposed; and (c) composing (i) the higher harmonic wave generated by the step (b) and (ii) a frequency component for which no higher harmonic wave has been generated by the step (b) of the frequency components into which the step (a) has decomposed, so as to generate the output signal, the step (b) including the steps of; (d) generating a nonlinear process signal (i) in which positive and negative signs of a frequency component for which the higher harmonic wave is to be generated are retained and (ii) which broadly monotonically increases nonlinearly with respect to the frequency component when the frequency component is located at least in the vicinity of 0 (zero); and (e) adding the nonlinear process signal to the frequency component, so as to generate the higher harmonic wave.
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Specification