A NOVEL DESIGN METHOD FOR DIRECTIONAL SELECTION BASED ON 2-DIMENSIONAL COMPLEX WAVELET PACKET TRANSFORM

作者：Kato Takeshi^*; Zhang Zhong; Toda Hiroshi; Imamura Takashi; Miyake Tetsuo

来源：International Journal of Wavelets, Multiresolution and Information Processing, 2013, 11(4): 1360010.

DOI：10.1142/S0219691313600102

• Wavelet packet transform
• directional selection
• directional filter
• edge detection
• space-frequency analysis
• image processing

In this paper, we propose a design method for directional selection in the two-dimensional complex wavelet packet transform (2D-CWPT). Current two-dimensional complex discrete wavelet transforms (2D-CDWT) can extract directional components from images, but the number of directions is small, and the directions and resolutions are fixed. Thus the current 2D-CDWTs are not flexible enough. In this study, we propose a new design method of the directional filters that can detect desirable direction components. Additionally flexible directional selection is achieved because the directional filters are added to the 2D-CWPT. Finally, the proposed method is applied to defect detection in semiconductor wafer circuits and an encouraging result is obtained.

• 出版日期2013-7