Proceedings ArticleDOI
Color halftone document segmentation and descreening
Chung-Hui Kuo,A.H. Tewfik,A.R. Rao +2 more
- Vol. 2, pp 1065-1068
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TLDR
A color halftone descreening technique based on the color sigma filter is proposed which does not assume any a priori knowledge about the halftoning process, making it applicable to any color Halftone image.Abstract:
The advent of electronic publishing creates strong interest in converting existing printed documents into electronic formats. During this process, image reproduction problems can occur due to the formation of moire patterns in the screened halftone areas. A wavelet packet based color halftone segmentation algorithm is first designed to locate possible halftone regions based on a decision function. A color halftone descreening technique based on the color sigma filter is proposed which does not assume any a priori knowledge about the halftoning process, making it applicable to any color halftone image. Combined with color halftone segmentation techniques, a complete document processing algorithm for color documents is proposed. Experimental results are offered to illustrate the performance of our algorithm.read more
Citations
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Patent
High-speed, high-quality descreening system and method
TL;DR: In this paper, a system and method descreen halftone images into a continuous tone image while preserving edge detail and reducing initial image blur, which can be applied to monochrome or color images.
Journal ArticleDOI
Low-complexity comprehensive labeling and enhancement algorithm for compound documents
TL;DR: A multiresolutional algorithm that segments a compound document and uses the results of the segmentation for document enhancement in copier applications that can be imagined as a very thin line that rapidly scans an input page while simultaneously producing an output page.
Patent
Method for detecting repetitive surfaces in an optical mouse
TL;DR: In this paper, an autocorrelator receives the image and generates a signal indicative of a repetitive background of the image, and an adder determines the signed difference between the maximum and minimum value.
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Ultrasound Fetal Image Segmentation Techniques: A Review
TL;DR: A review of segmentation techniques for 2D ultrasound fetal images and the metrics used to evaluate them are summarized.
Proceedings ArticleDOI
An efficient algorithm for periodic halftone identification
TL;DR: This paper provides a fast Fourier transform based method to classify periodic halftoned documents and shows that the overall accuracy of this method is 97% on a large data set which contains many difficult-to-classify images.
References
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Journal ArticleDOI
Unsupervised texture segmentation using Gabor filters
Anil K. Jain,Farshid Farrokhnia +1 more
TL;DR: A texture segmentation algorithm inspired by the multi-channel filtering theory for visual information processing in the early stages of human visual system is presented, which is based on reconstruction of the input image from the filtered images.
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Inverse halftoning and kernel estimation for error diffusion
TL;DR: It is shown that the kernel estimation algorithm combined with MAP projection provide the same performance in inverse halftoning compared to the case where the error diffusion kernel is known.
Journal ArticleDOI
Inverse halftoning via MAP estimation
TL;DR: This paper focuses on the inverse problem, that of finding efficient techniques for reconstructing high-quality continuous-tone images from their halftoned versions, based on a maximum a posteriori (MAP) estimation criteria using a Markov random field (MRF) model for the prior image distribution.
Journal ArticleDOI
A robust technique for image descreening based on the wavelet transform
TL;DR: A novel wavelet-based approach to recover continuous-tone (contone) images from halftone images is presented that lends itself to practical applications since it is independent of parameter estimation and, hence, universal to all types of halftoned images, including those obtained by scanning printed halftones.