A novel boundary growing approach for accurate skew estimation of binary document images

Palaiahnakote, Shivakumara; Kumar, G. Hemantha

doi:10.1016/j.patrec.2005.11.004

Cited by 18 publications

(10 citation statements)

References 12 publications

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“…Linear regression analysis approach [14] This method has two stages. Firstly, text lines containing characters of the scanned document image are extracted by use of boundary-growing approach; and then the coordinates of character positions are computed for each text line.…”

Section: Bounding Box Methods [1]mentioning

confidence: 99%

A novel approach of skew estimation and correction in persian manuscript text using radon transform

Hadi

Faez

Hadi

2012

2012 IEEE Symposium on Computers &Amp; Informatics (ISCI)

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Skew angle estimation is an important component of optical character recognition (OCR) systems. In this paper, a new optimizing method is introduced that is called "Finding the Skew with Radon (FSR)" in order to estimate the skew of the handwritten text. The above mentioned method has three stages. First of all, input text image is converted into a binary form and then the words and sub-words are became dilated. Then, the pattern angle is attained by using Radon transform. Finally, the inversion or non-inversion of the result image from the previous stage is recognized by extraction of horizontal histogram of that image and statistical analysis. To demonstrate the FSR method's outcomes, this proposed method is simulated for a complex of various Persian handwritten images, and then it is observed that its results in comparison with last methods are significantly optimized.

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Section: Bounding Box Methods [1]mentioning

confidence: 99%

A novel approach of skew estimation and correction in persian manuscript text using radon transform

Hadi

Faez

Hadi

2012

2012 IEEE Symposium on Computers &Amp; Informatics (ISCI)

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“…For the each matrix of (x i , y i ), the angles are calculated by using (3), (4) and (5). The average of several angles is regarded as the estimated skew angle.…”

Section: Linear Least Square Fittingmentioning

confidence: 99%

“…Skew detection of track images is necessary for developing the automatic data acquiring system to the broken magnetic tapes. The system is very significant for aviation accident investigations Image skew detection is mainly applied to optical character recognition (OCR) systems and document analysis systems (DAS) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. For the document image skew detection, many methods have been developed.…”

Section: Introductionmentioning

confidence: 99%

Skew detection of track images based on wavelet transform and linear least square fitting

Quan-fa

2009

2009 International Conference on Information and Automation

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A novel algorithm to detect the skew angle of a scanned track image is proposed. The proposed algorithm is based on wavelet transform and linear least square fitting method. First, a skew feature image of the original track image, which preserves the track's horizontal feature, is extracted by the wavelet transform. Given a threshold, the skew feature image is then transformed a binary image, in which most of the object points correspond to the top or bottom ends of tracks. Those object points are fitted by using linear least square method to get a line for each top or bottom end row of tracks. The average value of the skew angle of the several lines is regarded as the skew angles of the track images. Experimental results show that this algorithm performs well on track images. The effects of various wavelet basis are investigated too.

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“…Overview of these methods and a few recent hybrid techniques can be found in Refs. [2][3][4][5][6]. The Hough transform based technique was first used by Srihari and Govindaraju [7].…”

Section: Introductionmentioning

confidence: 99%

Hough transform based fast skew detection and accurate skew correction methods

Singh

Bhatia

Kaur

2008

Pattern Recognition

116

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A novel boundary growing approach for accurate skew estimation of binary document images

Cited by 18 publications

References 12 publications

A novel approach of skew estimation and correction in persian manuscript text using radon transform

A novel approach of skew estimation and correction in persian manuscript text using radon transform

Skew detection of track images based on wavelet transform and linear least square fitting

Hough transform based fast skew detection and accurate skew correction methods

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