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US 5,963,678 AGranted
Image signal processing apparatus and method
AssigneeCanon Kabushiki Kaisha
InventorShingo Nozawa
Life of this patent
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Abstract
An image signal having h.times.v pixel signals in the horizontal and vertical directions, respectively, is input to an image signal processor and converted into an image signal having m.times.n pixel signals in the horizontal and vertical directions, respectively. The converted image signal having m.times.n pixel signals is then converted into the image signal having h.times.v pixel signals and is then subjected to compression encoding. The compresed image signal is decoded and converted into the image signal having m.times.n pixel signals by thinning the pixel signals of the decoded image signal.
Claims23
An image signal processing apparatus, comprising:
- input means for inputting an image signal comprising h.times.v pixel signals in a horizontal direction and in a vertical direction;
- first conversion means for converting the image signal input by said input means into an image signal comprising m.times.n pixel signals in the horizontal direction and the vertical direction by thinning the pixel signals of the input image signal, wherein said first conversion means further comprises band limitation means for limiting a frequency band of the image signal input by said input means;
- second conversion means for converting the image signal comprising the m.times.n pixel signals obtained by said first conversion means into the image signal comprising the h.times.v pixel signals;
- and
- encoding means for performing compression encoding of the image signal converted by said second conversion means.
2 more elements
An image signal processing apparatus, comprising:
- input means for inputting an image signal comprising h.times.v pixel signals in a horizontal direction and in a vertical direction, subjected to compression encoding;
- decoding means for decoding the image signal input by said input means;
- conversion means for converting the image signal decoded by said decoding means into an image signal comprising m.times.n pixel signals in the horizontal direction and the vertical direction by thinning the pixel signals of the decoded image signal;
- and
- output means for selectively outputting one of the image signal output from said conversion means and the image signal output from said decoding means.
2 more elements
An image signal processing method, comprising the steps of:
- inputting an image signal comprising h.times.v pixel signals in a horizontal direction and in a vertical direction;
- converting the image signal input in said input step into an image signal comprising m.times.n pixel signals in the horizontal direction and the vertical direction by thinning the pixel signals of the input image signal, wherein said first conversion step includes band limitation step for limiting a frequency band of the image signal input in said input step;
- converting the image signal comprising the m.times.n pixel signals obtained in said m.times.n pixel signals conversion step into the image signal comprising the h.times.v pixel signals;
- and
- performing compression encoding of the image signal converted in said h.times.v pixel signals conversion step.
2 more elements
An image signal processing method, comprising the steps of:
- inputting an image signal comprising h.times.v pixel signals in a horizontal direction and in a vertical direction, subjected to compression encoding;
- decoding the image signal input in said input step;
- converting the image signal decoded in said decoding step into an image signal comprising m.times.n pixel signals in the horizontal direction and the vertical direction by thinning the pixel signals of the decoded image signal;
- and
- selectively outputting one of the image signal processed in said conversion step and the image signal processed in said decoding step.
2 more elements
An image signal processing apparatus, comprising:
- input means for inputting an image signal comprising h.times.v pixel signals in a horizontal direction and in a vertical direction;
- first conversion means for converting the image signal input by said input means into an image signal comprising m.times.n pixel signals in the horizontal direction and the vertical direction by thinning the pixels signals of the input image signal;
- second conversion means for converting the image signal comprising the m.times.n pixel signals obtained by said first conversion means into the image signal comprising the h.times.v pixel signals;
- encoding means for performing compression encoding of the image signal converted by said second conversion means;
- and
- selection means for selectively supplying said encoding means with one of the image signal output from said second conversion means and the image signal supplied to said first conversion means.
3 more elements
An image signal processing method, comprising the steps of:
- inputting an image signal comprising h.times.v pixel signals in a horizontal direction and in a vertical direction;
- converting the image signal input in said input step into an image signal comprising m.times.n pixel signals in the horizontal direction and the vertical direction by thinning the pixel signals of the input image signal;
- converting the image signal comprising the m.times.n pixel signals obtained in said m.times.n pixel signals conversion step into the image signal comprising the h.times.v pixel signals;
- and
- performing compression encoding of the image signal converted in said h.times.v pixel signals conversion step,
- wherein said encoding step selectively performs compression encoding of the image signal processed in said h.times.v pixel signals conversion step and the image signal supplied to said m.times.n pixel signals conversion step.
3 more elements
Dependencies are inferred from the claim text.