Dewarping Document Image Techniques: Survey and Comparative Study

2020 ◽  
pp. 2150031
Author(s):  
Marian Wagdy ◽  
Khaild Amin ◽  
Mina Ibrahim
Keyword(s):  
Comparative Study ◽  
Document Image ◽  
Geometric Distortion ◽  
New Classification ◽  
Digital Devices ◽  
Geometric Distortions ◽  
Camera Phones ◽  
Evaluation Metric ◽  
Document Page

In recent years, everyone has his/her own handheld digital devices such as PDAs and camera phones which are used to capture any documents, for example, posters, magazine and books. This is the simplest way to disseminating and collecting information. Unfortunately, the snapshot of this document in an uncontrolled environment has been suffering from different perspectives and geometric distortions, especially when a picture is taken from rolled document, page of thick book, multi-folded documents and crumpled pages. In such cases, the most common distortion appeared is warping text lines. In this paper, we present a survey and a comparative study of document image dewarping techniques which aim to solve the curled lines and geometric distortion problems. We introduce a new classification of the available dewarping document image techniques and investigate their available datasets. Finally, we present the evaluation metric to test these techniques.

scholarly journals Patterns of Cranial Venous System from the Comparative Anatomy in Vertebrates: Part I, Introduction and the Dorsal Venous System

2007 ◽  
Vol 13 (4) ◽  
pp. 335-344 ◽  
Author(s):  
T. Aurboonyawat ◽  
S. Suthipongchai ◽  
V. Pereira ◽  
A. Ozanne ◽  
P. Lasjaunias
Keyword(s):  
Comparative Study ◽  
Comparative Anatomy ◽  
Venous Drainage ◽  
Venous System ◽  
New Classification ◽  
The Comparative Study ◽  
The Brain

Many classifications of the cerebral venous system are found in the literature but they are seldom based on phylogenic study. Among vertebrates, venous drainage of the brain vesicles differs depending on the species. Due to the variability, poorly descriptive articles, and many different names used for the veins, the comparative study of the cranial venous system can hardly be performed in detail. The cranial venous system in vertebrates can be divided into three systems based on the evolution of the meninges and structures of the brain vesicles: the dorsal, lateral-ventral and ventricular systems. This study proposes a new classification of the venous drainage of brain vesicles using knowledge from a comparative study of vertebrates and focusing on the dorsal venous system. We found that the venous drainage of the neopallium and neocerebellum is involved with this system which may be a recent acquisition of cranial venous evolution.

PAGE SEGMENTATION AND CLASSIFICATION UTILIZING BOTTOM-UP APPROACH

2001 ◽  
Vol 01 (02) ◽  
pp. 345-361 ◽  
Author(s):  
ADNAN AMIN ◽  
RICKY SHIU
Keyword(s):  
Character Recognition ◽  
Optical Character Recognition ◽  
Document Image ◽  
Connected Components ◽  
Page Segmentation ◽  
Skew Correction ◽  
Recognition Systems ◽  
Document Page ◽  
Flat Bed Scanner

Document image processing has become an increasingly important technology in the automation of office documentation tasks. Automatic document scanners such as text readers and OCR (Optical Character Recognition) systems are an essential component of systems capable of those tasks. One of the problems in this field is that the document to be read is not always placed correctly on a flat-bed scanner. This means that the document may be skewed on the scanner bed, resulting in a skewed image. This skew has a detrimental effect on document analysis, document understanding, and character segmentation and recognition. Consequently, detecting the skew of a document image and correcting it are important issues in realizing a practical document reader. This paper presents the use of analyzing the connected components extracted from the binary image of a document page. Such an analysis provides a lot of useful information, and will be used to perform skew correction, segmentation and classification of the document. Moreover, we describe two new algorithms — one for skew detection and one for skew correction. The new skew correction algorithm we propose has been shown to be fast and accurate, with run times averaging under 1.5 CPU seconds and 30 seconds real time to calculate the angle on a 5000/20 DEC workstation. Experiments on over 100 pages show that the method works well on a wide variety of layouts, including sparse textual regions, mixed fonts, multiple columns, and even for documents with a high graphical content.

New Classification of Gemstone Colours

1971 ◽  
Vol 12 (7) ◽  
pp. 262-266
Author(s):  
K. F. Chudoba
Keyword(s):  
New Classification

Reductionism and holism in the philosophy of medicine

2020 ◽  
pp. 66-74
Author(s):  
E. Zakablukovskiy
Keyword(s):  
Philosophy Of Medicine ◽  
Point Of View ◽  
Social Model ◽  
Macro Level ◽  
New Classification

The article highlights certain aspects of the discussion on the topic of reductionism vs. holism in the philosophy of medicine. Classic radical reductionism is defeated by the concept of emergence. The s.c. bio-medical point of view on a malady, despite its relevance and clear benefit, is not recognized as universal as its adherents may claim, and it yields to an integral psycho-bio-social model. The author introduces a new classification of holism (vitalistic, social and individualistic) and makes appropriate recommendations to clinicians. It is social holism at the macro level that has proven effective in combating the spread of COVID-19.

scholarly journals A New Classification of Ficus

1977 ◽  
Vol 64 (2) ◽  
pp. 296 ◽  
Author(s):  
William Ramirez B.
Keyword(s):  
New Classification

Proposal for a new classification of vibratory urticaria/angioedema

2021 ◽  
Vol 9 (6) ◽  
pp. 2542-2543 ◽  
Author(s):  
María Antonia Pastor-Nieto ◽  
María Elena Gatica-Ortega ◽  
Laura Vergara-de-la-Campa ◽  
Ana María Giménez-Arnau
Keyword(s):  
New Classification
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