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Method and apparatus for detection of a skew angle of a document image using a regression coefficient 원문보기

IPC분류정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판)
  • H01J-040/14
출원번호 US-0355902 (1994-12-14)
우선권정보 JP-0331253 (1993-12-27)
발명자 / 주소
  • Bessho Goroh (Yokohama JPX) Ejiri Koichi (Narashino JPX)
출원인 / 주소
  • Ricoh Co., Ltd. (Tokyo JPX 03)
인용정보 피인용 횟수 : 40  인용 특허 : 6

초록 ▼

A method and apparatus for detecting the skew angle of a document image. Skew angle determination is performed by the steps of determining a set of sampling points from an input document image and processing X and Y coordinates of the sampling points in order to calculate a regression coefficient of

대표청구항 ▼

A method for detecting a skew angle, comprising the steps of: scanning a page of a document and generating a document image; determining sampling points of the document image using ruled lines of the document image; calculating a regression coefficient of the sampling points; and determining the ske

이 특허에 인용된 특허 (6)

  1. Onda Masanori (Iwatsuki JPX), Character and picture image data processing system.
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  2. Kawabata, Takashi, Correlation detecting device.
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  3. Zobel David H. (Redwood City CA), Method and structure for separating joined patterns for use in pattern and character recognition system.
    상세보기
  4. Britt Ronald H. (Leicester GB2), Optical character reader with skew recognition.
    상세보기
  5. Tanaka Hideaki (Daoto JPX) Kitamura Yoshihiko (Yamatokoriyama JPX), Optical character reading apparatus and method.
    상세보기
  6. Schlang, Arthur, Text line bounding system.
    상세보기

이 특허를 인용한 특허 (40)

  1. Zuev,Konstantin; Filimonova,Irina, Adjustment method of a machine-readable form model and a filled form scanned image thereof in the presence of distortion.
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  2. Shih,Yu Ting; Mao,Ching Lung, Angle de-skew device and method thereof.
    상세보기
  3. Michitoshi Sumikawa JP; Hiroyasu Takahashi JP, Apparatus and method of bitmap image processing, storage medium storing an image processing program.
    상세보기
  4. Yoshida, Akihito, Apparatus, method and computer readable medium that associates a plurality of possible word recognition results with an image.
    상세보기
  5. Baheti, Pawan Kumar; Barman, Kishor K.; Acharya, Hemanth P., Automatic correction of skew in natural images and video.
    상세보기
  6. Koshinaka Takafumi,JPX, Character recognition method, character recognition apparatus and recording medium on which a character recognition program is recorded.
    상세보기
  7. Morimoto, Atsuhisa; Narikawa, Shiro, Control apparatus, image reading apparatus, image forming apparatus, and recording medium for efficient rereading.
    상세보기
  8. Honma Hideo,JPX, Digital camera and document processing system using the digital camera.
    상세보기
  9. Honma, Hideo, Digital camera and document processing system using the digital camera.
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  10. Krishna Kumar, Raj Kumar; Baheti, Pawan Kumar; Gore, Dhananjay Ashok, Feature extraction and use with a probability density function (PDF) divergence metric.
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  11. Baheti, Pawan Kumar; Barman, Kishor K.; Krishnamoorthi, Raghuraman; Vrcelj, Bojan, Identifying a maximally stable extremal region (MSER) in an image by skipping comparison of pixels in the region.
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  12. Baheti, Pawan Kumar; Gore, Dhananjay Ashok; Koo, Hyung-Il; Lee, Te-Won, Identifying regions of text to merge in a natural image or video frame.
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  13. Konishi, Yohsuke; Morimoto, Atsuhisa; Matsuoka, Teruhiko; Imaizumi, Daisaku, Image determining apparatus, image processing system, and recording medium.
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  14. Hirohata, Hitoshi; Yoshida, Akihito; Morimoto, Atsuhisa; Konishi, Yohsuke, Image processing apparatus, image reading apparatus, image forming apparatus, and image processing method.
    상세보기
  15. Morimoto, Atsuhisa, Image processing method and apparatus for determining orientations based on reliabilities of a plurality of portions into which image has been divided or for determining orientations of portions of image divided by user's input so as to recognize characters for each divided portion of image, image forming apparatus, and storage medium.
    상세보기
  16. Yang Che-Chu TW, Image processing system for scanning a rectangular document.
    상세보기
  17. Prakash,Ravi; Rohe,Clair Frederick; Shirley,Robert E., Image rotation with substantially no aliasing error.
    상세보기
  18. Takahashi Hiroyasu,JPX, Image segmentation apparatus and a character recognition apparatus.
    상세보기
  19. Krishna Kumar, Raj Kumar; Baheti, Pawan Kumar, Lower modifier detection and extraction from devanagari text images to improve OCR performance.
    상세보기
  20. Takahashi Hiroyasu,JPX ; Arima Toshimichi,JPX, Method and apparatus for recognizing a quadrilateral object contained in an input bitmap image.
    상세보기
  21. Andreasson,Markus; Åstrand,Per, Method and device for recording of information.
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  22. Hasegawa Fumihiro,JPX, Method for deleting ruled lines and a recording medium storing programs for performing the method.
    상세보기
  23. Tsai, Yu-Fen; Chang, Te-Chih, Method for determining scan line misalignments.
    상세보기
  24. Tsai, Yu-Fen; Chang, Te-Chih, Method for determining scan line misalignments.
    상세보기
  25. Honsinger, Chris W.; Jones, Paul W., Method for image skew detection.
    상세보기
  26. Oh, Sang-Wook; Hwang, Seong-Taek; Kim, Hyun-Soo; Kim, Sang-Ho; Lee, Guee-Sang; Kim, Soo-Hyung; Yang, Hyung-Jeong; Kim, Eui-Chul, Method of compensating for distortion in text recognition.
    상세보기
  27. Barman, Kishor K.; Baheti, Pawan Kumar; Krishna Kumar, Raj Kumar, Method of handling complex variants of words through prefix-tree based decoding for Devanagiri OCR.
    상세보기
  28. Meyer, Hans Christian; Carlin, Mats Stefan; Fosseide, Knut Tharald, Method, system, digital camera and asic for geometric image transformation based on text line searching.
    상세보기
  29. Meyer, Hans Christian; Carlin, Mats Stefan; Fosseide, Knut Tharald, Method, system, digital camera and asic for geometric image transformation based on text line searching.
    상세보기
  30. Ferman, Ahmet Mufit, Methods and systems for locating text in a digital image.
    상세보기
  31. Baheti, Pawan Kumar; Barman, Kishor K.; Gore, Dhananjay Ashok; Sundaram, Senthilkumar, Parameter selection and coarse localization of interest regions for MSER processing.
    상세보기
  32. Lee, Shih-Jong J.; Louis, Piloco, Robust method for automatic reading of skewed, rotated or partially obscured characters.
    상세보기
  33. Ramachandrula, Sitaram; Banerjee, Serene; Parikh, Pulkit; Shaffi, Noushath; Kuchibhotla, Anjaneyulu Seetha Rama; Dey, Prasenjit, Skew detection.
    상세보기
  34. Ramachandrula, Sitaram; Banerjee, Serene; Parikh, Pulkit; Shaffi, Noushath; Kuchibhotla, Anjaneyulu Seetha Rama; Dey, Prasenjit, Skew detection.
    상세보기
  35. Lee, Chung-I; Lin, Hai-Hong; Xie, De-Yi; Tao, Shuai-Jun; Yi, Zhi-Qiang; Yao, Jun-Chao, System and method for processing an image file using a computing device.
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  36. Nijemcevic, Djordje; Galic, Sasa, Techniques in optical character recognition.
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  37. Baheti, Pawan Kumar; Barman, Kishor K.; Krishna Kumar, Raj Kumar, Trellis based word decoder with reverse pass.
    상세보기
  38. Baheti, Pawan Kumar; Barman, Kishor K.; Krishna Kumar, Raj Kumar, Trellis based word decoder with reverse pass.
    상세보기
  39. Curtis, Donald B., User interface method for skew correction.
    상세보기
  40. Curtis, Donald B., Visualizing, creating and editing blending modes methods and systems.
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