Skew detection and correction based on Hough transform and Harris corners

Enhanced Radon Transform Skew Estimation And Correction Algorithm For Scanned Multiple-Choice Forms

“…There are a different variety of techniques that have been proposed as reviewed in literature for the estimation and correction of skew in scanned document images (Aithal et al, 2011;Boukharouba, 2017;Dhandra et al, 2006;Gaofeng et al, 2010;Gari et al, 2017;Haji, James, & Chandran, 2016;Wagdy, Faye, & Rohaya, 2014). However, these approaches mainly focus on document images; specifically, images that contain a significant amount of text characters with the assumption that the text direction is the same as that of the border line.…”

“…A detailed survey of over 50 various skew detection algorithms was given in (Hull, 1998). These classes largely include projection profile analysis (Papandreou & Gatos, 2011), the connected component analysis (Sarfraz et al, 2007), and more recently Radon and Hough transform methods (Gari et al, 2017;Rajput, Som, & Kar, 2016).…”

“…In this stage, the process of attenuating the undesirable attributes such as the skew from the input image takes place, and this paves way to an errorless result at the output. The common pre-processing algorithms include the Hough transform approach (Gari, Khaissidi, Mrabti, Chenouni, & El Yacoubi, 2017), projection profile based (Jain & Borah, 2014), regression analysis, bounding box approach (Shafii & Sid-Ahmed, 2015), and connected component analysis (Sarfraz, Mahmoud, & Rasheed, 2007).…”

A Hybrid Approach for Skew Detection and Correction in the Multi-script Scanned Document

“…Shafii's method [21] Radon method with Harries corner [18] Radon method with smearing and Wiener filter [19] Proposed method…”

“…There are many methods: Hough transform [6] [8], Discrete Fourier Algorithm [9], Fast Fourier transform [10,11], Fast frequency domain [12], Nearest neighbor [4], Interline cross [13], Projection Profile [14], Principal Component Analysis [15,16], Radon transform [17], Hough transform and Harris corners [18], Radon transform and Wiener filter [19], and straight fitting [19] for skew estimation and correction. newspaper.…”