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A fast algorithm for skew detection of document images using morphology

A.K. Das, B. Chanda
2001 International Journal on Document Analysis and Recognition  
This paper presents a new method for automatic detection of skew in a document image using mathematical morphology. The proposed algorithm is extremely fast as well as independent of script forms.  ...  This simplified representation leads to more efficient, robust, as well as simpler algorithms for document image analysis including optical character recognition (OCR).  ...  We express our indebtedness for helping us in various ways to Ms. Senty Sarkar, Mr. Nilanjan Deb, and  ... 
doi:10.1007/pl00010902 fatcat:paxdkuwa5rbnhm7h3ugqpvyexu

Automated page orientation and skew angle detection for binary document images

Daniel S Le, George R Thoma, Harry Wechsler
1994 Pattern Recognition  
., A fast algorithm for skew detection of document images using morphology, Cao, Y.[Yang], Wang, S.[Shuhua], Li, H.  ...  ., Perspective rectification of document images using fuzzy set and morphological operations, IVC(23), No. 5, 1 May 2005, pp. 541-553.  ...  [Changsong] , Rectifying the bound document image captured by the camera: A model based approach,  ... 
doi:10.1016/0031-3203(94)90068-x fatcat:4qygkia67bdqtm35skrwu6x3ui

Fast and Robust Perspective Rectification of Document Images on a Smartphone

Williem, Christian Simon, Sungdae Cho, In Kyu Park
2014 2014 IEEE Conference on Computer Vision and Pattern Recognition Workshops  
This paper presents a perspective rectification framework for mobile device that is fast and robust to recovering the fronto-parallel view of perspectively distorted document images.  ...  To ameliorate such problems, the proposed framework is designed to pursue a fast and robust algorithm to detect horizontal and vertical vanishing points efficiently and robustly.  ...  Skew Rectification To rectify the skew distortion, the proposed framework extracts the candidate horizontal lines using Hough line detection algorithm [2] .  ... 
doi:10.1109/cvprw.2014.37 dblp:conf/cvpr/WilliemSCP14 fatcat:4lyo5f34cnbdbb6vq73imoby5y

Ultra High Speed Approach For Document Skew Detection And Correction Based On Centre Of Gravity

Seyyed Yasser Hashemi
2014 Zenodo  
In this paper an efficient and fast algorithm for Document Skew Detection (DSD) based on the concept of segmentation and Center of Gravity (COG) is proposed.  ...  Skew detection and correction (SDC) has a direct effect in efficiency and exactitude of documents' segmentation and analysis and thus is considered as a very important step in documents' analysis field  ...  NEW SKEW DETECTION ALGORITHM A. Overview The proposed algorithm uses the concept of COG of the polygon to determine Arabic/Persian document skew.  ... 
doi:10.5281/zenodo.1336586 fatcat:xfhp7d4kejcuve6v27tqlvqwoy

Using mathematical morphology for document skew estimation

Laurent A. Najman, Elisa H. Barney Smith, Jianying Hu, James Allan
2003 Document Recognition and Retrieval XI  
We propose a concise definition of the skew angle of document, based on mathematical morphology. This definition has the advantages to be applicable both for binary and grey-scale images.  ...  We then discuss various possible implementations of this definition, and show that results we obtain are comparable to those of other existing algorithms.  ...  The use of mathematical morphology in the context of document image analysis allows us to give a clean definition of the skew angle of a document, through the definition of a new operator based on the  ... 
doi:10.1117/12.526615 dblp:conf/drr/Najman04 fatcat:gu6ooqs45naqbpwuwevbd7srlq

Automatic optimized document skew pre-processor for character segmentation algorithm

Vladan Vuckovic, Boban Arizanovic
2017 Facta universitatis - series Electronics and Energetics  
In this paper, as a part of character segmentation algorithm, an automatic optimized document skew correction approach based on Hough transform is presented.  ...  The importance of skew correction in document image analysis lies in the fact that further processing is impossible if the document image is skewed.  ...  Science and Arts (SANU) and Museum of Nikola Tesla (providing original typewritten documents of Nikola Tesla).  ... 
doi:10.2298/fuee1704611v fatcat:kouunxk435bwzbstkiafps33ja

A New Method to Estimate Skew Angle in Printed and Historical Document Images

2019 International journal of recent technology and engineering  
In this paper, a new approach to assess the skew angle for scanned/printed documents and historical document images has been proposed.  ...  The proposed technique detects skew and corrects it by initial letter (X1, Y1+200) from left margin of the resized (800X800) image and (X1+200, Y1) from top margin.  ...  Next to estimate a range of skew angle a coarse estimation algorithm is used. Here skew angle of every text line was considered to determine the skew angle of the entire document.  ... 
doi:10.35940/ijrte.d8057.118419 fatcat:sqr4adsqf5e4ndmisp3iv4dppi

Global and Local Skew Detection of Handwritten Gurmukhi Script

Mandeep Kaur, Lovnish Bansal, Jagdeep Singh
2013 International Journal of Computer Applications  
Das et. al, [12] proposed a method based on morphology in which they used run-length smoothening (RSLA) algorithm that is, a closing of the image using line structuring element that forms solid black  ...  Omar [10] proposed skew detection and correction technique for Arabic document images based on centre of gravity.  ... 
doi:10.5120/14253-1632 fatcat:gcnz3yzodvfsbltmvczu4c7zia

A real-time embedded solution for skew correction in banknote analysis

Adnan Rashid, Andrea Prati, Rita Cucchiara
2011 CVPR 2011 WORKSHOPS  
This paper presents a computer vision system developed for correcting image skew in applications for banknote analysis and classification.  ...  In particular, we address: a) an efficient labeling with an unionfind approach for hole filling, b) a fast Hough transform implementation, and c) a very high-speed estimation of affine transformation for  ...  The simplest approach is instead to segment the ROI (Region of Interest) and use its contour for skew detection. The banknote image is acquired with a Contact Image Sensor (CIS) (Fig. 2(a) ).  ... 
doi:10.1109/cvprw.2011.5981806 dblp:conf/cvpr/RashidPC11 fatcat:oke3srqqkndvtbxwy2kqugcx4a

Modified Approach of Hough Transform for Skew Detection and Correction in Documented Images

Deepak Kumar, Dalwinder Singh
2012 International Journal of Research in Computer Science  
Many methods have been proposed by researchers for the detection of skew in binary image documents.  ...  Which degrade the performance of OCR and image analysis system so to detection and correction of skew angle is important step of preprocessing of document analysis.  ...  Many methods have been proposed by researchers for the detection of skew in binary image documents [1] .  ... 
doi:10.7815/ijorcs.23.2012.027 fatcat:exx7vrzh2ve4xpfu7tjfr2knpm

Image Purification Technique for Myanmar OCR Applying Skew Angle Detection and Free Skew

Chit San Lwin, Wu Xiangqian
2019 International Journal of Scientific Research in Science and Technology  
Our method give an accuracy of 100% for line segmentation and 99.92% for skew angle detection and free skew.  ...  Our technique implement skew angle detection and free skew, noisy border correction, extra page elimination, line segmentation from scanned images of Myanmar text.  ...  Using Morphological Skeleton and Progressive Probabilistic Hough Transform (PPHT), Omar et al. [5] also proposed a skew angle detection and correction technique for historical scanned documents  ... 
doi:10.32628/ijsrst19615 fatcat:6ometi2xond4hatlo62tldcvxa

An Efficient Document Skew Detection Method Using Probability Model and Q Test

Kai Huang, Zixuan Chen, Min Yu, Xiaolang Yan, Aiguo Yin
2019 Electronics  
Document skew detection is one of the key technologies in most of the document analysis systems.  ...  However, existing skew detection methods either have low accuracy or require a large amount of computation.  ...  Conclusions In this paper, a novel fast and accurate method for skew angle detection and correction is proposed.  ... 
doi:10.3390/electronics9010055 fatcat:5uaxnzlj7bgrzmi6wr2ukgfu7a

Skew Detection and Correction of Mushaf Al-Quran Script using Hough Transform

Salem Saleh Bafjaish, Mohd Sanusi, Mohammed Nasser, Amirul Ramzani, Hairulnizam Mahdin
2018 International Journal of Advanced Computer Science and Applications  
The technique uses Hough transform lines detection for calculating the skew angulation. It works for different version of Mushaf Al-Quran image pages which has skewed text zones.  ...  Document skew detection and correction is mainly one of base preprocessing steps in the document analysis.  ...  In [11] a proposed a simple and fast algorithm that determine the skew angle of the image as well as the slant angle of the text characters using the gradient orientation histogram.  ... 
doi:10.14569/ijacsa.2018.090852 fatcat:lla75uql4ja3xbdvscpvr2lilu

DOCUMENT IMAGE SKEW DETECTION: SURVEY AND ANNOTATED BIBLIOGRAPHY [chapter]

JONATHAN J. HULL
1998 Series in Machine Perception and Artificial Intelligence  
Algorithms that estimate the angle at which a document image is rotated (called a document's skew) are surveyed. Four broad classes of technique are identified.  ...  The basic method used by each class of technique is presented and the contributions of individual algorithms within each class are discussed.  ...  Jain, "A robust and fast skew detection algorithm for generic documents," Pattern Recognition, 29, no. 10, October, 1996, 1599-1630.  ... 
doi:10.1142/9789812797704_0003 dblp:conf/das/Hull96 fatcat:hllaz4y5jzbldges6jlo5tdq4y

Performance Evaluation of Improved Skew Detection and Correction using FFT and Median Filtering

Neha Watts, Jyoti Rani
2014 International Journal of Computer Applications  
This paper presents a new skew detection and correction technique using FFT & median filtering.  ...  The proposed algorithm is planned and implemented in MATLAB using Image processing toolbox. To illustrate the algorithm 25 skewed images are taken for experimental purpose.  ...  Skew detection and correction using Cross-correlation Malemath [11] has described a robust yet fast algorithm for skew detection in binary document images.  ... 
doi:10.5120/17599-8174 fatcat:3x2vvfcovva4rg76uuqcttejpm
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