Image binarizing apparatus
First Claim
1. An image binarizing apparatus comprising:
- photoelectric converting means for photoelectrically converting an image into an electric image signal;
image signal separating means for separating an image signal acquired from said photoelectric converting means into a predetermined number of portions to yield partial images;
extracting means for extracting no more than three levels of brightness of a highest brightness, a lowest brightness and an average brightness as parameters from said partial images for a partial image block of interest and for each of a plurality of partial image blocks adjacent to said partial image block of interest;
threshold value computing means for inputting said extracted parameters comprised of no more than said three levels of brightness which are extracted from said partial image block of interest and all of said adjacent partial image blocks to a neural network, and causing said neural network to compute a single threshold value based on only said extracted parameters corresponding to said no more than three levels of brightness; and
binarizing means for selectively binarizing a plurality of pixels which form part of all of the pixels constituting an image, based on said threshold value acquired by said threshold value computing means.
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Abstract
An image binarizing apparatus, which comprises an image sensor for inputting a character image or a line image, an A/D converter for digitizing the output of the image sensor, a frame memory for temporary storage of the digital image, a window circuit for generating address information for dividing the stored image into a predetermined number of partial images, a brightness extractor for obtaining the highest brightness, lowest brightness and average brightness for the pixels for each block, a neural network which provides the optimum threshold value based on pre-learned data when receiving the highest brightness, lowest brightness and average brightness, a binarizer for binarizing each pixel of a partial image block from the frame memory based on the optimum threshold value ("white pixel" when the value of the brightness of the pixel is larger than the output value of the neural network, and "black pixel" when the value of the brightness of the pixel is smaller than the output value of the neural network), and another frame memory for storing the binarized image at a predetermined address.
71 Citations
10 Claims
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1. An image binarizing apparatus comprising:
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photoelectric converting means for photoelectrically converting an image into an electric image signal; image signal separating means for separating an image signal acquired from said photoelectric converting means into a predetermined number of portions to yield partial images; extracting means for extracting no more than three levels of brightness of a highest brightness, a lowest brightness and an average brightness as parameters from said partial images for a partial image block of interest and for each of a plurality of partial image blocks adjacent to said partial image block of interest; threshold value computing means for inputting said extracted parameters comprised of no more than said three levels of brightness which are extracted from said partial image block of interest and all of said adjacent partial image blocks to a neural network, and causing said neural network to compute a single threshold value based on only said extracted parameters corresponding to said no more than three levels of brightness; and binarizing means for selectively binarizing a plurality of pixels which form part of all of the pixels constituting an image, based on said threshold value acquired by said threshold value computing means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An image binarizing apparatus comprising:
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photoelectric converting means for photoelectrically converting an image into an electric image signal; image signal separating means for separating an image signal acquired from said photoelectric converting means into a predetermined number of portions to yield partial images; block selecting means for selecting a partial image block of interest from yielded partial images; threshold value computing means for computing a plurality of threshold values for said partial image block of interest selected by said block selecting means; extracting means for extracting no more than three levels of brightness of a highest brightness, a lowest brightness and an average brightness as parameters from said partial images for said partial image block of interest and for each of said partial image blocks adjacent to said partial image block of interest; and threshold value selecting means for inputting said extracted parameters comprised of no more than said three levels of brightness which are extracted by said extracting means to a neural network, and causing said neural network to select only one of a plurality of threshold values computed by said threshold value computing means based on only said extracted parameters corresponding to said no more than three levels of brightness, and wherein a plurality of pixels which form part of all the pixels constituting an image are selectively binarized on the basis of a selected threshold value. - View Dependent Claims (8, 9, 10)
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Specification