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Geometric Rectification of Camera-Captured Document Images

Geometric Rectification of Camera-Captured Document Images,10.1109/TPAMI.2007.70724,IEEE Transactions on Pattern Analysis and Machine Intelligence,Jia

Geometric Rectification of Camera-Captured Document Images   (Citations: 12)
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Abstract Compared to typical scanners, handheld cameras offer convenient, flexible, portable, and non-contact image capture, which enables many new applications and breathes new life into existing ones. However, camera-captured documents,may,suffer from distortions caused by non-planar document,shape and perspective projection, which lead to failure of current OCR technologies. We present a geometric rectification framework for restoring the frontal-flat view of a document,from a single camera-captured image. Our approach,estimates 3D document,shape from texture flow information obtained directly from the image without requiring additional 3D/metric data or prior camera calibration. Our framework provides a unified solution for both planar and curved documents and can be applied in many, especially mobile, camera-based document analysis applications. Experiments show that our method produces results that are significantly more OCR compatible than the original images. Index Terms Camera-based OCR, image rectification, shape estimation, texture flow analysis.
Journal: IEEE Transactions on Pattern Analysis and Machine Intelligence - PAMI , vol. 30, no. 4, pp. 591-605, 2008
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    • ...Our reconstruction approach can be applied to general smooth surfaces and not restricted to simple parametric surfaces such as cylinders or developable surfaces as in [4, 18, 8, 9, 17]...
    • ...3D reconstruction. To make 2D warp estimation more stable, many previous works assume a strong shape model, e.g., part of a cylinder [4], piecewise cylinder [18] or a developable surface [8, 9, 17]...
    • ...Compared to previous works [4, 8, 9], our methods use explicit domain knowledge to better estimate the two dimensional warping in document images...
    • ...As shown in [8, 9], the stroke statistics can be captured by locating the peaks in the edge orientation histogram of a local region...
    • ...Instead of simply smoothing over local estimations [9], we provide a formulation robust to interfering strokes and achieves stable estimation even in small scales...
    • ...Note that, in principle, such surfaces cannot be reconstructed by previous approaches [8, 9, 17]...

    Yuandong Tianet al. Rectification and 3D reconstruction of curved document images

    • ...There are several approaches that have been proposed to rectify a perspective projection distorted image [10]...

    Pei-Lun Hsiehet al. Recognition of blurred license plate images

    • ...While the subject of document processing to correct for perspective distortions and non-uniform illuminations has been explored before [1-6], we developed a robust pipeline for automatically processing documents, and implemented several prototypes for smart phones [7,8]...

    Jian Fanet al. Mobile document scanning and copying

    • ...Like the quantitative evaluation method used in [32], we have tested our algorithm on 8 synthetic pairs...

    Hyung il Kooet al. Composition of a Dewarped and Enhanced Document Image From Two View Im...

    • ...In recent years, the study of document image binarization was mostly being concentrates on the scanner-based method [1], while the algorithm proposed in this paper is based on the study of camera-based method [2] [3] [4]...

    Tong Li-Jinget al. Document Image Binarization Based on NFCM

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