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Patent

Binary halftone detection

Jeng-Nan Shiau, +1 more
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TLDR
In this paper, an exclusive-or operation is applied to a region of a binary bit map and its spatially shifted version, and the resulting bits from the exclusive or operation are summed over the region.
Abstract: 
A method to detect frequency and angle of a binary halftone pattern. The method employs an exclusive-or operation which is applied locally to a region of a binary bit map and its spatially shifted version. The resulting bits from the exclusive-or operation are summed over the region. The exclusive-or operation is repeated for a range of shift values. In a halftone region, the shift at which the minimum sum occurs reflects the angle and the frequency of the halftone.

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Apparatus and method of segmenting an image and/or receiving a signal representing the segmented image in an image coding and/or decoding system

Hyung-soo Ohk, +3 more
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Method and system for selective smoothing of halftoned objects using bitmap encoding

Michael Dale Stevens
TL;DR: In this article, a halftone circuit, operatively connected to the image type classification circuit, converts the input image data, identified as picture image data or text/graphics image data to halftones, and a tile pattern circuit replaces non-halftone cluster areas in the tile patterns with a predetermined pattern.
Journal ArticleDOI

Document page classification algorithms in low-end copy pipeline

Xiaogang Dong, +6 more
- 01 Oct 2008 - 
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References
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Patent

Automatic multimode continuous halftone line copy reproduction

James C. Stoffel
TL;DR: In this paper, an image data handling system was proposed to automatically detect and segregate from a stream of image pixels high frequency half-tone image input, continuous tone image input and line image input which may be present in the pixel stream.
Patent

Method and system for classifying and processing of pixels of image data

Raymond J. Clark, +3 more
TL;DR: In this paper, a plurality of microclassifiers are used to determine a distinct image characteristic value of a pixel and then a macro-reduction circuit is used to classify the pixel as an image type.
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Apparatus and method for segmenting and classifying image data

Shriram Revankar, +3 more
TL;DR: In this article, a method and apparatus for segmenting image data into windows and for classifying the windows as typical image types includes making two passes through the image data, one for identifying windows and the other for labeling each of the pixels as a particular image type.
Patent

Method and system for fuzzy image classification

Stuart A. Schweid, +2 more
TL;DR: In this article, a method and system electronically fuzzy classify a pixel belonging to a set of digital image data with respect to a membership of the pixel in a plurality of image classes.
Patent

Image processing apparatus using approximate auto correlation function to detect the frequency of half-tone image data

Ying-wei Lin, +1 more
TL;DR: In this article, the presence of minimums of φ(k) at times indicative of predetermined half-tone image frequencies is detected and an output signal indicative of the presence or absence of the minimums at the predetermined half tone image frequencies are provided.