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US 5,345,517 AGranted
Image reduction apparatus
AssigneeCanon Kabushiki Kaisha
InventorsAkihiro Katayama, Mitsuru Maeda, Yasuji Hirabayashi, Tadashi Yoshida
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Abstract
An image reduction apparatus includes a smoothing unit for smoothing binary image data, a binarization unit for binarizing an output from the smoothing unit, a detection unit for detecting an attribute of the binary image data smoothed by the smoothing unit, a plurality of correction units corresponding to a plurality of attributes, and a selector for selecting one of the correction units in accordance with the attribute detected by the detection unit. An output from the binarization unit is corrected by the correction unit selected by the selector.
Claims37
An image reduction apparatus comprising:
- input means for inputting image data representing an image;
- and
- processing means for executing a reduction process on the image data input by the input means and outputting reduced image data,
- wherein said processing means further comprises:
- detection means for detecting first and second attributes of the image represented by the image data input by said input means;
- correction means for correcting the reduction process on the basis of a first attribute detected by said detection means;
- and
- correction means for correcting the reduction process on the basis of a second attribute detected by said detection means.
5 more elements
An image reduction apparatus comprising:
- input means for inputting image data representing an image;
- and
- processing means for executing a reduction process on the image data input by the input means and outputting reduced image data,
- wherein said processing means further comprises:
- reduction means for executing a reduction process on the image data input by said input means;
- memory means for storing reduced image data obtained by a previous reduction-process operation of said reduction means;
- first correction means for correcting the reduction process in a first way on the basis of a pattern of an image represented by both the image data on which the reduction process is to be executed and the reduced image data stored in said memory means;
- second correction means for correcting the reduction process in a second way on the basis of a pattern of an image represented by both the image data on which the reduction process is to be executed and the reduced image data stored in said memory means;
- and
- selection means for selecting said first or second correction means.
7 more elements
An image reduction method comprising the steps of:
- inputting image data representing an image;
- detecting first and second attributes of the image represented by the image data;
- and
- selecting a first or a second mode for executing a reduction process,
- wherein, in said first mode, the reduction process is executed on the basis of a first attribute detected in said detecting step, and in said second mode, the reduction process is executed on the basis of a second attribute detected in said detecting step.
2 more elements
An image reduction method comprising the steps of:
- executing a reduction process on image data representing an image;
- storing reduced image data obtained by the previous reduction process;
- and
- selecting a first or a second mode for executing a reduction process,
- wherein, in said first mode, the reduction process is executed in a first way on the basis of a first pattern of an image represented by both the image data for which the reduction process is to be executed and the previously reduced image data, and in said second mode, the reduction process is executed in a second way on the basis of a second pattern of an image represented by both the image data for which the reduction process is to be executed and the previously reduced data.
2 more elements
An image reduction apparatus comprising:
- input means for inputting image data representing an image;
- generating means for generating a signal indicating whether the image represented by the image data input by said input means is a positive image or a negative image;
- and
- processing means for executing a reduction process on the image data input by the input means and outputting reduced image data,
- wherein said processing means executes a reduction process so that a black line of the image is preserved when the signal indicates that the image represented by the image data input by said input means is a positive image and so that a white line of image is preserved when the signal indicates that the image is a negative image.
2 more elements
An image reduction method comprising the steps of:
- inputting image data representing an image;
- generating a signal indicating whether the image represented by the image data is a positive image or a negative image;
- and
- executing a reduction process on the image data input in said inputting step and outputting reduced image data,
- wherein, in said executing step, a reduction process is executed so that a black line of the image is preserved when the signal indicates that the image represented by the image data input in said inputting step is a positive image and so that a white line of image is preserved when the signal indicates that the image is a negative image.
2 more elements
Dependencies are inferred from the claim text.