Binarization of document images with various object sizes

Degraded Document Image Binarization Using Active Contour Model

“…We have carried out a detailed comparative analysis of our proposed method against seven notable methods, namely Otsu's [15], Niblack's [12], Sauvola's [22], Rivest-Hénault's [21], Hadjadj's [6], Hadjadj's [5], and Hadjadj's [7] methods. Otsu's [15] method is based on global thresholding technique; whereas (c) Niblack's [12] (d) Sauvola's [22] (e) Rivest-Hénault's [21] (f) Hadjadj's [6] (g) Hadjadj's [5] (h) Hadjadj's [7] (i) Proposed method Niblack's [12] and Sauvola's [22] methods are adaptive thresholding based. All the other remaining methods are active contour model based methods.…”

“…All the other remaining methods are active contour model based methods. For comparison purpose, we have implemented Otsu's [15], Niblack's [12], Sauvola's [22], and Hadjadj's [7] methods. Values for the parameters used in the implementation are set as prescribed in the respective papers.…”

“…Few works have also been reported on document image binarization using active contour models [5][6][7]21]. In [7], Chan-Vese active contour model with Sauvola's binarization method [22] is used for binarization of document images with various object sizes. The limitation of the method proposed in [7] is that it binarizes relatively less noisy documents.…”

“…In [7], Chan-Vese active contour model with Sauvola's binarization method [22] is used for binarization of document images with various object sizes. The limitation of the method proposed in [7] is that it binarizes relatively less noisy documents. Document images with complex background and large variation in background intensities can not be binarized efficiently with this method.…”

“…Also, methods [5,6,21] have been tested on very few datasets. To show the efficiency of the proposed work, we have compared our work with previously mentioned methods [5][6][7]21].…”