Image processing method and apparatus employing gray scale images having fewer bits per pixel and gray scale image restoration using small areas of an image window
First Claim
1. An image processor comprising:
- pseudo-gray-scale image generating circuit means for converting input image data, which is represented by a first prescribed number of bits per pixel, into pseudo-gray-scale image data represented by a second prescribed number of bits, which is less than said first prescribed number of bits;
image restoration circuit means for restoring the pseudo-gray-scale image data generated by said pseudo-gray-scale image generating circuit means for each and every one of a plurality of small areas, each of which comprises a plurality of pixels, with said each small area serving as one restored pixel, and outputting restored image data; and
a plurality of similarity operating circuit means, which operate in parallel, each for calculating an index value representing a degree of similarity between the restored image data outputted by said image restoration circuit means and text data representing a standard image set in advance, the standard images for the plurality of similarity operating circuit means being different from one another.
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Accused Products
Abstract
Input image data representing the image of a subject imaged by a video camera 9 is applied from an A/D converter circuit 11 to a dither-image generating circuit 13, in which the image data is binarized in accordance with the error diffusion method, whereby dither image data represented by one bit per pixel is obtained. A plurality of small areas each comprising a plurality of pixels are set within a window caused to scan the dither image, and the dither image data is summed in each and every small area by an image restoration circuit 14, whereby gray-level image data, in which each small area serves as one pixel, is restored. Difference or correlation values between the restored image data and text data set in advance with regard to standard images which are different from one another are calculated, for the window at each and every position, by arithmetic circuits 15a˜15k. The smallest difference or the largest correlation values and the positions of the windows in which this smallest difference or the largest correlation values are produced are respectively sensed by corresponding peak holding circuits 16a˜16k.
35 Citations
41 Claims
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1. An image processor comprising:
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pseudo-gray-scale image generating circuit means for converting input image data, which is represented by a first prescribed number of bits per pixel, into pseudo-gray-scale image data represented by a second prescribed number of bits, which is less than said first prescribed number of bits; image restoration circuit means for restoring the pseudo-gray-scale image data generated by said pseudo-gray-scale image generating circuit means for each and every one of a plurality of small areas, each of which comprises a plurality of pixels, with said each small area serving as one restored pixel, and outputting restored image data; and a plurality of similarity operating circuit means, which operate in parallel, each for calculating an index value representing a degree of similarity between the restored image data outputted by said image restoration circuit means and text data representing a standard image set in advance, the standard images for the plurality of similarity operating circuit means being different from one another. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An image processor comprising:
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converting means for converting input image data into image data representing images different in rotational angle or in size from the image represented by the input image data in sequence at a predetermined period of time; pseudo-gray-scale image generating circuit means for converting the image data converted by said converting means and represented by a first prescribed number of bits per pixel, every time the converted image data is supplied from said converting means, into pseudo-gray-scale image data represented by a second prescribed number of bits, which is less than said first prescribed number of bits; image restoration circuit means for restoring the pseudo-gray-scale image data for each and every one of a plurality of small areas, each of which comprises a plurality of pixels, with said each small area serving as one restored pixel, every time the pseudo-gray-scale image data is supplied from said pseudo-gray-scale image generating circuit means and outputting restored image data; and similarity operating circuit means for calculating an index value representing a degree of similarity between the restored image data and text data representing a standard image set in advance, every time the restored image data is outputted by said image restoration circuit means. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An image processor comprising:
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converting means for converting input image data into image data representing images different in rotational angle or in size from the image represented by the input image data in sequence at a predetermined period of time; pseudo-gray-scale image generating circuit means for converting the image data converted by said converting means and represented by a first prescribed number of bits per pixel, every time the converted image data is supplied from said converting means, into pseudo-gray-scale image data represented by a second prescribed number of bits, which is less than said first prescribed number of bits; image restoration circuit means for restoring the pseudo-gray-scale image data for each and every one of a plurality of small areas, each of which comprises a plurality of pixels, with said each small area serving as one restored pixel, every time the pseudo-gray-scale image data is supplied from said pseudo-gray-scale image generating circuit means and outputting restored image data; and a plurality of similarity operating circuit means, which operate in parallel, each for calculating an index value representing a degree of similarity between the restored image data and text data representing a standard image set in advance, every time the restored image data is outputted by said image restoration circuit means, the standard images for the plurality of similarity operating circuit means being formed based on a single model and different in rotational angle or in size from one another. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. An image processing method comprising the steps of:
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converting input image data of one frame, which is represented by a first prescribed number of bits per pixel, into pseudo-gray-scale image data of one frame represented by a second prescribed number of bits, which is less than the first prescribed number of bits; summing the pseudo-gray-scale image data for each and every one of a plurality of small areas, each of which comprises a plurality of pixels and is provided in a window that scans the pseudo-gray-scale image generated, thereby restoring the image data for a window at each and every position, with said each small area serving as one restored pixel; and calculating index values with use of text data of a plurality of standard images which are different from one another for each restored image data of the plurality of frames in parallel, the index value representing a degree of similarity between the restored image data of each window and text data representing the standard image set in advance. - View Dependent Claims (37)
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38. An image processing method comprising the steps of:
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converting input image data of one frame into image data representing images of a plurality of frames different in rotational angle or in size from the image represented by the input image data in sequence at a predetermined period of time; converting the image data of one frame converted by above converting step and represented by a first prescribed number of bits per pixel, every time the converted image data of one frame is supplied, into pseudo-gray-scale image data of one frame represented by a second prescribed number of bits, which is less than the first prescribed number of bits; summing said pseudo-gray-scale image data of one frame for each and every one of a plurality of small areas, each of which comprises a plurality of pixels and is provided in a window that scans the pseudo-gray-scale image generated, thereby restoring the image data for a window at each and every position, with said each small area serving as one restored pixel, every time the pseudo-gray-scale image data of one frame is supplied; and calculating an index value representing a degree of similarity between the restored image data of each window and text data representing a standard image set in advance every time the restored image data of one frame is supplied. - View Dependent Claims (39)
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40. An image processing method comprising the steps of:
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converting input image data of one frame into image data representing images of a plurality of frames different in rotational angle or in size from the image represented by the input image data in sequence at a predetermined period of time; converting the image data of one frame converted by the above converting step and represented by a first prescribed number of bits per pixel, every time the converted image data of one frame is supplied, into pseudo-gray-scale image data of one frame represented by a second prescribed number of bits, which is less than the first prescribed number of bits; summing said pseudo-gray-scale image data of one frame for each and every one of a plurality of small areas, each of which comprises a plurality of pixels and is provided in a window that scans the pseudo-gray-scale image generated, thereby restoring the image data for a window at each and every position, with said each small area serving as one restored pixel, every time the pseudo-gray-scale image data of one frame is supplied; and calculating index values with use of text data of a plurality of standard images which are formed based on a single model and different in rotational angle or in size from one another for each restored image data of the plurality of frames in parallel and every time the restored image data is supplied, the index value representing a degree of similarity between the restored image data of each window and text data representing the standard image set in advance. - View Dependent Claims (41)
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Specification