Signal processing device and control program for sharpening images
First Claim
1. A signal processing device that subjects a signal indicative of a moving image constituted by a plurality of temporarily consecutive frames to a sharpening process for the moving image, to output a signal indicative of a moving image thus sharpened, each of the frames including a plurality of block regions, each of the plurality of block regions include one or a plurality of adjacent pixels,the signal processing device configured or programmed to include:
- a motion detection section configured or programmed to detect motion between the frames with respect to each of the plurality of block regions;
a first high-frequency component generation section configured or programmed to generate a harmonic produced by sharpening a signal indicative of a moving image of a block region from which the motion has been detected by the motion detection section; and
a signal output section configured or programmed to output, with respect to the block region from which the motion has been detected by the motion detection section, the harmonic having been produced by sharpening a motion region signal that is a signal indicative of a moving image of the block region from which the motion has been detected by the motion detection section, while outputting, with respect to the block region from which the motion has not been detected by the motion detection section, a non-motion region signal that is a signal indicative of a moving image of the block region from which the motion has been detected by the motion detection section,the first high-frequency component generation section including;
a first low-frequency component removing section configured or programmed to remove, from frequency components of the motion region signal, at least a direct current component, to generate and output a first low-frequency-free signal;
a first nonlinear process section configured or programmed to receive the first low-frequency-free signal, to generate a first nonlinear process signal (i) in which positive and negative signs of the first low-frequency-free signal are retained and (ii) which broadly monotonically increases nonlinearly with respect to the first low-frequency-free signal when values of the first low-frequency-free signal are at least in the vicinity of 0, and to output the first nonlinear process signal; and
an addition section configured or programmed to add the first nonlinear process signal to the motion region signal, to generate the harmonic.
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Abstract
A signal processing device subjects a signal indicating a moving image constituted by frames to a sharpening process for the moving image, to output a signal indicating the sharpened moving image, and includes: a motion detection section for detecting motion between the frames for each block region including one or a plurality of adjacent pixels constituting each frame; a sharpening process section for subjecting a signal indicating an image of a block region from which motion has been detected to a nonlinear process by a nonlinear process section and sharpening the signal to generate a harmonic; and a signal output section for outputting, for the block region from which motion was detected, the harmonic produced by sharpening a signal indicating a moving image of the block region, while outputting, for a block region from which motion was not detected, a signal indicating a moving image of the block region.
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Citations
15 Claims
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1. A signal processing device that subjects a signal indicative of a moving image constituted by a plurality of temporarily consecutive frames to a sharpening process for the moving image, to output a signal indicative of a moving image thus sharpened, each of the frames including a plurality of block regions, each of the plurality of block regions include one or a plurality of adjacent pixels,
the signal processing device configured or programmed to include: -
a motion detection section configured or programmed to detect motion between the frames with respect to each of the plurality of block regions; a first high-frequency component generation section configured or programmed to generate a harmonic produced by sharpening a signal indicative of a moving image of a block region from which the motion has been detected by the motion detection section; and a signal output section configured or programmed to output, with respect to the block region from which the motion has been detected by the motion detection section, the harmonic having been produced by sharpening a motion region signal that is a signal indicative of a moving image of the block region from which the motion has been detected by the motion detection section, while outputting, with respect to the block region from which the motion has not been detected by the motion detection section, a non-motion region signal that is a signal indicative of a moving image of the block region from which the motion has been detected by the motion detection section, the first high-frequency component generation section including; a first low-frequency component removing section configured or programmed to remove, from frequency components of the motion region signal, at least a direct current component, to generate and output a first low-frequency-free signal; a first nonlinear process section configured or programmed to receive the first low-frequency-free signal, to generate a first nonlinear process signal (i) in which positive and negative signs of the first low-frequency-free signal are retained and (ii) which broadly monotonically increases nonlinearly with respect to the first low-frequency-free signal when values of the first low-frequency-free signal are at least in the vicinity of 0, and to output the first nonlinear process signal; and an addition section configured or programmed to add the first nonlinear process signal to the motion region signal, to generate the harmonic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A signal processing device that subjects a signal indicative of a moving image constituted by a plurality of temporarily consecutive frames to a sharpening process for the moving image, to output a signal indicative of a moving image thus sharpened, each of the frames including a plurality of block regions, each of the plurality of block regions include one or a plurality of adjacent pixels,
the signal processing device configured and programmed to include: -
a motion detection section configured or programmed to detect motion between the frames with respect to each of the plurality of block regions; a first high-frequency component generation section configured or programmed to generate a first sharpening signal by sharpening a signal indicative of a pixel group including pixels positioned adjacently in a main scanning direction of a moving image of a block region from which the motion has been detected by the motion detection section; a second high-frequency component generation section configured or programmed to generate a second sharpening signal by sharpening a signal indicative of a pixel group including pixels positioned adjacently in a sub-scanning direction of the moving image represented by the first sharpening signal; and a signal output section configured or programmed to output, with respect to the block region from which the motion has been detected by the motion detection section, the second sharpening signal having been produced by sharpening a motion region signal that is a signal indicative of a moving image of the block region from which the motion has been detected by the motion detection section, while outputting, with respect to the block region from which the motion has not been detected by the motion detection section, a non-motion region signal that is a signal indicative of a moving image of the block region from which the motion has been detected by the motion detection section, the first high-frequency component generation section including; a first low-frequency component removing section configured or programmed to remove, from frequency components of a main scanning direction signal that is a signal indicative of a pixel group including pixels positioned adjacently in a main scanning direction of a moving image of the block region from which the motion has been detected by the motion detection section, at least a direct current component, to generate and output a first low-frequency-free signal; a first nonlinear process section configured or programmed to generate a first nonlinear process signal (i) in which positive and negative signs of the first low-frequency-free signal are retained and (ii) which broadly monotonically increases nonlinearly with respect to the first low-frequency-free signal when values of the first low-frequency-free signal are at least in the vicinity of 0; and a first addition section configured or programmed to add the first nonlinear process signal to the main scanning direction signal, to generate the first sharpening signal, the second high-frequency component generation section including; a second low-frequency component removing section configured or programmed to remove, from frequency components of a sub-scanning direction signal that is a signal indicative of a pixel group including pixels positioned adjacently in a sub-scanning direction of a moving image represented by the first sharpening signal, at least a direct current component, to generate a second low-frequency-free signal; a second nonlinear process section configured or programmed to generate and output a second nonlinear process signal (i) in which positive and negative signs of the second low-frequency-free signal are retained and (ii) which broadly monotonically increases nonlinearly with respect to the second low-frequency-free signal when values of the second low-frequency-free signal are at least in the vicinity of 0; and a second addition section configured or programmed to add the second nonlinear process signal to the sub-scanning direction signal, to generate the second sharpening signal. - View Dependent Claims (15)
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Specification