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Pre-SWOT Report. Online Handwritten Arabic OCR ( O nline H andwritten R ecognition: OHR )

Pre-SWOT Report. Online Handwritten Arabic OCR ( O nline H andwritten R ecognition: OHR ). Dr. Ashraf Al- Marakby Eng. Hesham Osman Eng. Randa Al-Anwar Dr. Mohamed Waleed Fakhr Dr. Mohsen Rashwan Eng. Eman Mostafa. 1-Introduction and challenges.

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Pre-SWOT Report. Online Handwritten Arabic OCR ( O nline H andwritten R ecognition: OHR )

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  1. Pre-SWOT Report.Online Handwritten Arabic OCR(Online Handwritten Recognition: OHR) Dr. Ashraf Al-Marakby Eng. Hesham Osman Eng. Randa Al-Anwar Dr. Mohamed WaleedFakhr Dr. MohsenRashwan Eng. EmanMostafa

  2. 1-Introduction and challenges • The wide spread use of pen-based hand held devices such as PDAs, smart-phones, and tablet-PCs, increases the demand for high performance on-line handwritten recognition systems. • These systems recognize text while the user is writing with an on-line writing device, capturing the temporal or dynamic information of the writing. This information includes the number, duration, and order of each stroke (a stroke is the writing from pen down to pen up).

  3. Main Challenges in Arabic OHR • Unconstrained writing problem • Dotting problem • Delayed Strokes problem: association between letters and their diacritical marks. • Overlapping problem

  4. 2- Applications • Education domain: Huge number of attractive applications for students and teachers, over tablet PCs and other devices (smart pens, smart boards, etc.) • Online mapping of notes to text in online data collection (questionnaires, forms, etc.) • Huge number of Mobile applications for business people and others.

  5. 3- State of the art in products (Latin script) • OHR is a highly mature technology for Latin script with excellent performance. • MicroSoft, RitePen, VisionObjects, QuickScript are a few very successful OHR solution providers for more than 20 languages. • Most require no training, allow for user-defined dictionary and user adaptation. • Performance is claimed to be excellent for unconstrained, continuous writing.

  6. 4- State of the art in products (Arabic script) • Sakhr and ImagiNet both offer OHR products for most MS based devices (HTC, Pocket PC, PDA). • Also, VisionObjects and QuickScript have OHR Arabic support and claim good performance. • A comparison between these products on a standard benchmark is needed to find out the strengths and weaknesses of each.

  7. 5- State of the art in Research for Arabic OHR • Focus mainly on producing true unconstrained continuous cursive writing. • Focus on developing algorithms that can run in real time and on limited resources. • Significant recent efforts: Most recent research employ Recurrent Neural Networks, HMMs, fusion of other pattern recognition techniques. Also, making use of the offline image as an extra source of information.

  8. Competition ICDAR2009 • The database consists of 23,251 Arabic words handwritten by more than 130 different writers (ADAB database: Tunisian City names). • For testing, 2400 words are used written by 24 writers different than the ones in training. • Best performance obtained by VisionObjects team: 99%. The system use neural networks with other PR techniques. • Second best is MDLSTM by Alex Graves: 96%. Using a hierarchy of multidimensional recurrent neural networks.

  9. 6- Required Modules • Pre-processing tools: delayed strokes, smoothing, resampling, etc. • PAW or letter Segmentation and extraction tool • Language models • Feature extraction tools. • Statistical training tools: HTK, SRI, Matlab, and many neural network tools. • Error analysis tools: Need to be implemented.

  10. 7- Required Resources • Major question: How many PAWs? And How many of them are most frequently used? (an estimate of 500 is given). • Word annotated corpus (estimated 2000 pages by 2000 writers). • Character/PAW annotated corpus for initial models to cover 10 instances for each PAW. • Dictionaries with PAW transcriptions

  11. 8- Available Resources and Gaps • ADAB database is the only large one available (limited domain, limited number of writers). • Annotation and segmentation tools required. • More data required.

  12. 9- LR proposed by ALTEC • For the training data, we suggest 10,000 writers, one page per person. • In the first phase, we will start with 2000 writers, each writing two pages (average of 50words per page), which gives about 200,000 words. We could retain 150,000 words for training and 50,000 for benchmarking. • The vocabulary issue must be addressed. Also, we need to ensure the fair coverage of the PAWs. • Cairo university has annotation tools to assist manual segmentation of the online data, and Dr. SherifAbdou will kindly make it available to ALTEC.

  13. 10- Preliminary SWOT analysis • Strengths: • The expertise in DSP, pattern recognition, image processing, NLP, and stochastic methods • Potential to have huge amounts of annotated data. • Weaknesses: • No comprehensive benchmarking available for Arabic OHR • No standard training database available for research community for Arabic OHR • Opportunities: • Large market of such a tech. of over 300 million native speakers, plus other numerous interested parties, over a wide range of platforms (tablet PCs, smart phones, etc.)

  14. Threats: • Other R&D groups all over the world (esp. in the US) is working hard and racing for more reliable products and for more applications. • Microsoft could make its OHR Arabic product open source when it is done.

  15. 11- Survey • Specify the application that OHR recognition will be used for • What is the data used/intended to train the system? • What is the benchmark to test your system on? • Would you be interested to contribute in the data collection. At what capacity? • Would you be interested to buy Arabic OHR annotated data? • Would you be interested to contribute in a competition • How many persons working in this area in your team? What are their qualifications? • What are the platforms supported/targeted in your application? • What is the market share anticipated in your application? • Would your application support any other languages? Explain.

  16. List of Survey Targets • Sakhr • ImagiNet • RDI • Orange- Cairo • IBM- Cairo • Cairo University • Ain Shams University • Arab academy (AAST) • AUC • GUC • Nile University • Azhar university • Helwan university • Assuituniversity • Other research Centers from outside Egypt • Other companies that are users of the technology

  17. 12- Key Figures in this Field • Dr. Alex Graves (TU Munich, Germany). • Dr. Stephan Knerr (CEO, VisionObjects) • Dr. HazemAbdelAzeem (Egypt)

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