Image processing apparatus
AssigneeCanon Kabushiki Kaisha
InventorsHiroshi Tanioka, Yoshitaka Ogino
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Abstract
An image processing apparatus has a pixel data input unit, and a processing unit for processing pixel data input from the input unit. The processing unit has a discriminating unit for discriminating an image type of the input pixel data. The discriminating unit has a first discriminator for discriminating the image type of a pixel of interest in a first mode using data of the pixel of interest and pixel data adjacent to the pixel of interest, and a second discriminator for discriminating the image type of the pixel of interest in a second mode different from the first mode. The unit discriminates the image type of the pixel of interest using the discrimination results of the first and second discriminators.
Claims30
An image processing apparatus comprising:
- pixel data input means;
- and
- processing means for processing pixel data input via said input means,
- wherein said processing means comprises two-dimensional smoothing means for smoothing density levels of a plurality of pixels including a pixel of interest, first combination means for combining predetermined level data as offset data with the output data of said two-dimensional smoothing means, binarizing means for binarizing data of the pixel of interest in accordance with the output of said first combination means and discriminating means for discriminating an image type of the data of the pixel of interest in accordance with continuity, in two dimensions of the pixel of interest with a predetermined set of other pixels of the binary data from said binarizing means, said continuity being measured on the basis of which of said set of other pixels have values having a predetermined relation to a value of the pixel of interest.
An image processing apparatus comprising:
- pixel data input means;
- and
- processing means for processing pixel data input via said input means,
- wherein said processing means comprises binarizing means for binarizing the input pixel data, first discriminating means for discriminating an image type in accordance with continuity in two dimensions of a pixel of interest with a predetermined set of other pixels, on the basis of binary pixel data output from said binarizing means, said continuity being measured on the basis of which of said set of other pixels have values having a predetermined relation to a value of the pixel of interest, second discriminating means for discriminating an image type by using an image type discriminating method different from a method used by said first discriminating means, and select means for selecting one of a plurality of image forming processes relating to the pixel data in accordance with results of discrimination performed by both of said first and said second discriminating means.
An image processing apparatus comprising:
- pixel data input means for inputting pixel data quantized to m-bit data;
- means for processing the m-bit pixel data input from said input means, wherein said processing means comprises operation means for performing an operation on the m-bit data to output only upper n bits (1<n<m) of the operation result as n-bit pixel data;
- memory means for storing a plurality of n-bit pixel data output from said operation means;
- and
- discriminating means for discriminating an image type in accordance with a plurality of n-bit pixel data stored in said memory means.
An image processing apparatus comprising:
- pixel data input means;
- and
- processing means for processing pixel data input via said input means,
- wherein said processing means comprises binarizing means for binarizing the input pixel data, first discriminating means for discriminating an image type in a first mode in accordance with continuity in dimensions of a pixel of interest with a predetermined set of other pixels, on the basis of binary output from said binarizing means, said continuity being measured on the basis of which of said set of other pixels have values having a predetermined relation to a value of the pixel of interest, second discriminating means for discriminating an image type in a second mode in accordance with a density difference between the pixel of interest and said set of other pixels, and select means for selecting one of a plurality of image forming processes relating to the pixel data in accordance with results of discrimination performed by said first and second discriminating means.
Dependencies are inferred from the claim text.