Patent
Image data processing system with adaptive binary quantization
TLDR
In this paper, an extractor extracts, from image data to be binarized, a feature amount of a target pixel including at least a maximum density difference among pixels in a local region including the target pixel.Abstract:
An extractor extracts, from image data to be binarized, a feature amount of a target pixel including at least a maximum density difference among pixels in a local region including the target pixel. A predictor predicts an image type of the target pixel in accordance with a minimum density value among the pixels in the local region. A selector selects one of the feature amount of the target pixel from the extractor and a feature amount obtained by adding the feature amount of the target pixel to feature data of neighboring pixels in accordance with the image type predicted by the predictor. A discriminator discriminates the image type of the target pixel in accordance with the feature amount selected by the selector. A weighting section weights the discrimination result from the discriminator with respect to the neighboring pixels of a predetermined range preceding the target pixel in accordance with distances from the target pixel to the neighboring pixels so as to generate feature data of the neighboring pixels selectively used by the selector. A determinator adaptively determines a threshold value for binarizing the image data in accordance with the discrimination result. A binarizing section binarizes the image data in units of target pixels by using the threshold value determined by the determinator.read more
Citations
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Patent
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References
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Patent
Method and apparatus for gray level signal processing
Hiroshi Ochi,Nobuji Tetsutani +1 more
TL;DR: In this article, a gray level signal processing method is proposed to determine whether an image signal derived from an original document belongs to the character image area which needs high resolution or the continuous-tone image area that needs gray level reproduction such as for photographs, and quantizes the signal in a quantization method suitable for the image area to which the signal belongs.
Patent
Universal thresholder/discriminator
TL;DR: In this paper, a selective thresholding of scanned pel values based on detected characteristics of the material to be reproduced is proposed, where the characteristics of interest for each pel include its reflectance (gray) level, a gradient value derived from surrounding pels, a hysteresis value based on the thresholding decisions for preceding pels.
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Document image entry system
TL;DR: In this article, the image data is subdivided into a plurality of blocks each including a predetermined number of pixels, and a domain recognition is conducted to determine whether the block is a binary block or a halftone block.
Patent
Image processing apparatus
TL;DR: In this article, an image processing apparatus is disclosed which inputs/outputs an image, in which image data items having different information quantity for one pixel are mixed to one another.
Patent
Image processing method and apparatus with conditional correction of error data
Akihiro Katayama,Hidefumi Ohsawa +1 more
TL;DR: In this paper, an image processing apparatus which handles an image as a digital signal, comprising: an input device to input image data indicative of a concentration of an image; a binarization circuit to binarize the input data; a positive/negative state detection circuit to detect whether error data generated when the image data is binarized by the binarisation circuit is in a positive state or a negative state; and a selector to select whether the output data generated upon binarizing is to be corrected or not, on the basis of the positive or negative state of