System for coring an image-representing signal
First Claim
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1. An image-processing system comprising:
- a substantially non-ringing, non-aliasing, localized transform spectrum analyzer responsive to an input image-representing signal defined in at least one dimension of the represented image by a spectrum of spatial frequencies within a range extending downward from a maximum frequency fm to zero, said analyzer separating said input-signal spectrum in descending spatial frequency order starting from fm into a group of one or more contiguous bandpass subspectra output signals each of which subspectrum has a nominal bandwidth no greater than one octave within said range, and into a remnant subspectrum output signal contining all those spatial frequencies of said input-signal spectrum which are below those contained in the lowest spatial frequency bandpass subspectrum output-signal;
means for coring at least one of said bandpass subspectra output signals and remnant subspectrum output signal, thereby introducing spurious out-of-band spatial frequency components into each cored subspectrum output signal; and
a spectrum synthesizer coupler to said analyzer through said coring means and responsive to all of said subspectra signals from said analyzer being applied thereto for deriving an output image-representing signal;
wherein said synthesizer is comprised of substantially non-ringing, non-aliasing filter means individually associated with the subspectrum of at least each cored signal that is lower than the highest spatial frequency bandpass subspectrum output signal, for substantially removing at least those spurious frequency components therefrom which are above-band with regard to that subspectrum, and means for summing all said subspectra signals, including both any that has been cored and/or filtered and any that has been neither cored nor filtered, thereby to derive said output image representing signal;
whereby any noise component originally present in the spectrum of said input image-representing signal has been reduced in the spectrum of said output image-representing signal without introducing any signifficant amount of aliasing or other spurious spatial frequency component in the spectrum of said output image-representing signal.
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Abstract
Noise reduction is achieved, without the introduction of noticeable artifacts in the displayed image, using (1) a non-ringing, non-aliasing, localized transfer, octave-band spectrum analyzer for separating the video signal representing the image into subspectra signals, (2) separate coring means for one or more of the analyzed subspectra signals, and (3) then a synthesizer employing one or more non-ringing, non-aliasing filters for deriving an output image-representing signal from all of the subspectra signals.
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Citations
24 Claims
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1. An image-processing system comprising:
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a substantially non-ringing, non-aliasing, localized transform spectrum analyzer responsive to an input image-representing signal defined in at least one dimension of the represented image by a spectrum of spatial frequencies within a range extending downward from a maximum frequency fm to zero, said analyzer separating said input-signal spectrum in descending spatial frequency order starting from fm into a group of one or more contiguous bandpass subspectra output signals each of which subspectrum has a nominal bandwidth no greater than one octave within said range, and into a remnant subspectrum output signal contining all those spatial frequencies of said input-signal spectrum which are below those contained in the lowest spatial frequency bandpass subspectrum output-signal; means for coring at least one of said bandpass subspectra output signals and remnant subspectrum output signal, thereby introducing spurious out-of-band spatial frequency components into each cored subspectrum output signal; and a spectrum synthesizer coupler to said analyzer through said coring means and responsive to all of said subspectra signals from said analyzer being applied thereto for deriving an output image-representing signal; wherein said synthesizer is comprised of substantially non-ringing, non-aliasing filter means individually associated with the subspectrum of at least each cored signal that is lower than the highest spatial frequency bandpass subspectrum output signal, for substantially removing at least those spurious frequency components therefrom which are above-band with regard to that subspectrum, and means for summing all said subspectra signals, including both any that has been cored and/or filtered and any that has been neither cored nor filtered, thereby to derive said output image representing signal; whereby any noise component originally present in the spectrum of said input image-representing signal has been reduced in the spectrum of said output image-representing signal without introducing any signifficant amount of aliasing or other spurious spatial frequency component in the spectrum of said output image-representing signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An image processing system for processing an input spectrum-analyzed image-representing signal, wherein said image-representing signal that has been spectrum-analyzed defines, in at least one dimension of the represented image spectrum, spatial frequencies within a range extending from a maximum frequency fm down to zero, and wherein said spectrum-analyzed image-representing signal, starting with fm, is comprised, in descending spatial frequency order, of a group of one or more separate contiguous bandpass subspectra signals, each of which has a nominal bandwith no greater than one octave within said range, and a remnant subspectrum signal containing all those spatial frequencies of said image-representing signal spectrum which are below those contained in the lowest spatial frequency bandpass spectrum signal;
- said system including;
means for coring at least one of said bandpass subspectra signals, thereby introducing spurious out-of-band spatial frequency components into each cored subspectrum signal; and a spectrum synthesizer coupled to said coring means and having all analyzed subspectra signals, including both those that have been cored and those that have not been cored, applied thereto for deriving an output image-representing signal; wherein said synthesizer is comprised of substantially non-ringing, non-aliasing filter means individually associated with the subspectrum of at least each cored signal that is lower than the highest spatial frequency bandpass subspectrum output signal, for substantially removing at least those spurious frequency components therefrom which are above-band, and means for summing all said subspectra signals, including both any that has been cored and/or filtered and any that has been neither cored nor filtered, thereby to derive said output image-representing signal; whereby any noise component originally present in said spectrum analyzed image-representing signal has been reduced in the spectrum of said output image-representing signal without introducing any significant amount of aliasing or other spurious spatial frequency component in the spectrum of said output image-representing signal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
- said system including;
Specification