Entropy Based Skew Correction of Document Images
نویسندگان
چکیده
The document images that are fed into an Optical Character Recognition system, might be skewed. This could be due to improper feeding of the document into the scanner or may be due to a faulty scanner. In this paper, we propose a skew detection and correction method for document images. We make use of the inherent randomness in the Horizontal Projection profiles of a text block image, as the skew of the image varies. The proposed algorithm has proved to be very robust and time efficient. The entire process takes less than a second on a 2.4 GHz Pentium IV PC.
منابع مشابه
Skew detection and correction in document images bsed on straight-line fitting
During document scanning, skew is inevitably introduced into the incoming document image. Since the algorithms for layout analysis and character recognition are generally very sensitive to the page skew, skew detection and correction in document images are the critical steps before layout analysis. In this paper, a novel skew detection method based on straight-line fitting is proposed. And a co...
متن کاملDocument Analysis And Classification Based On Passing Window
In this paper we present Document analysis and classification system to segment and classify contents of Arabic document images. This system includes preprocessing, document segmentation, feature extraction and document classification. A document image is enhanced in the preprocessing by removing noise, binarization, and detecting and correcting image skew. In document segmentation, an algorith...
متن کاملSkew Angle Estimation and Correction of Hand Written, Textual and Large areas of Non-textual Document Images: A Novel Approach
Skew angle estimation and correction of a document page is an important task for document analysis and optical character recognition (OCR) applications. Many approaches of skew detection can process pure textual document images successfully. But it is a challenging problem to process documents like handwritten, large areas of non-textual contents. In this direction, a novel approach for textual...
متن کاملSkew and Slant Correction for Document Images Using Gradient Direction - Document Analysis and Recognition, 1997., Proceedings of the Fourth International Conference on
A fast algorithm is presented in this pa;per for skew and slant correction in printed document images. The algorithm employs only the gradient information. The skew angle is obtained by searching for a peak in the histogram of the gradient orientation of the input greylevel image. The skewness of the document is corrected by a rotation at such an angle. The slant of characters can also be detec...
متن کاملSkew and Slant Correction for Document Images Using Gradient Direction
A fast algorithm is presented in this paper for skew and slant correction in printed document images. The algorithm employs only the gradient information. The skew angle is obtained by searching for a peak in the histogram of the gradient orientation of the input greylevel image. The skewness of the document is corrected by a rotation at such an angle. The slant of characters can also be detect...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2007