數(shù)字空間輪廓的小波描述子
Wavelet Descriptor of contours in digital space
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摘要: 為了描述數(shù)字空間目標(biāo)輪廓,便于計(jì)算機(jī)圖形表達(dá),提出一種適于描述序列點(diǎn)輪廓的小波描述子。將數(shù)字空間輪廓視為周期序列,并基于離散小波變換給出序列點(diǎn)輪廓小波描述子的具體表達(dá)。結(jié)合具體醫(yī)學(xué)圖像輪廓進(jìn)行相應(yīng)的應(yīng)用研究,并與Fourier輪廓描述子進(jìn)行了對(duì)比,研究結(jié)果表明,在具有相同比特率的情況下,序列點(diǎn)輪廓小波描述子具有更好的保形性,同時(shí)實(shí)現(xiàn)了對(duì)輪廓數(shù)據(jù)的壓縮。
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關(guān)鍵詞:
- 小波; 描述子; Fourier輪廓描述子; 數(shù)據(jù)壓縮
Abstract: To describe contours in digital space and simplify the presentation of computer graphics, a wavelet descriptor is presented, which is suitable for contours constructed with a set of points. According to the fact that contours in digital space is periodical, wavelet descriptor is defined based on wavelet analysis of discrete periodic signal. Application of the wavelet descriptor for medical image contour description is achieved. Comparing with Fourier descriptor, this work shows that the contours expressed by wavelet descriptor can make a good shape preserving, and the data for constructing the contours is compressed. -
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