Optical Recognition of Chinese Characters by Richard Suchenwirth, Jun Guo, Irmfried Hartmann, Georg

By Richard Suchenwirth, Jun Guo, Irmfried Hartmann, Georg Hincha, Manfred Krause, Zheng Zhang

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16 Frame Preprocessing Depending on the actual conditions. the raw picture as delivered from the digitizer or scanner may need preprocessing even before segmentation of the picture into characters. A digitizer may for instance produce high spatial frequencies on horizontal edges, giving them a "half-bitting" appearance after binarization that impairs feature extraction. ln such cases, a simple horizontal filter can be run over the raw frame to equalize this kind of disturbance. s ( 2. t- 1) 0 that averages each pixel with its neighbor to the right but otherwise has little averaging influence on the image.

Ln most modern input methods, either the pronunciation or the shape of the characters (or both) is used for the coding to facilitate learning. Phonetic input methods require the user to know the standard (as opposed to dialect) pronunciation of the character and be able to spell it in the correct orthography (in the PRC, this is mostly the Hanyu Pti7_Yin transcription system, sometimes in abbreviated form [She 85]; outside the PRC, the older Zhuyin Fuhao system is sometimes used). These requirements sometimes Iead to a generation gap: young educated operators who have learned Pinyin in school often prefer phonetic input, while older persans are often frustrated by unsuccessful phonetizations and hence tend to prefer graphic coding.

A rotation by a small angle may also impair the segmentation of the image into lines and characters. Finally, the user is free to vary some parameters (illumination, focus. or adjustment of the aperture). Thus, camera input is useful for experimental research where stable and controlled recording conditions are to be observed. A drawback of video camera input is that with a typical resolution of 512*512 pixels, only a small section of the original text that is approximately the size of a postage stamp can be read (see fig.

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