Zooming technique of Chinese character patterns: Based on pyramid structure

• Main Authors: Liao, Han-yuan, 廖漢源
• Other Authors: Prof. Tsai, Mu-king
• Format: Others
• Language: en_US
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/22038432288768335175

碩士 === 國立中央大學 === 資訊及電子工程研究所 === 81 === A technique for zooming digital Chinese character pattern is represented. This technique is developed based on pyramid structure which is suggested for decomposing signal into dif- ferent resolutions. In other words, the pyramid structure can devide the source signal into a series of bandpass signals. Both Laplacian pyramid structure and subband pyramid structure which are constructed by a series of bandpass filters are employed here. The shrunk character patterns can be obtained by downsampling and quantizing the outputs of lowpass filters. The expanded character patterns are obtained by upsampling the original patterns and using the lowpass filters as the interpolators. Like the traditional techniques, the zig-zag phenomenon also appears in expanded patterns. Two smoothing techniques are employed here for acquiring more excellent expanded character patterns. Simutaneously, the outline font of Chinese character patterns can be obtained from the outputs of the highpass filters. Moreover, the multiresolution structures for pyramid structure also are introduced to obtain the character patterns in various resolutions. For efficient reason, a more fast method for convolution also is suggested.