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This applet obtains the edge of the 2-d image using the wavelet decomposition. The bases of the wavelet decomposition can be selected from Haar, Daubechies (N=3), and Daubechies (N=5). As shown in the page of "wavelet decomposition of image", the low-freq. components and the high-freq.components of the image are successively obtained by applying the wavelet decomposition to the image. Moreover, the original image is reconstructed from the low-freq. and high-freq. components. This procedure is called the inverse wavelet transform. By reconstructing the image from only the high-freq. components (without low-freq. components), the high-freq. image is obtained, and this image can be used to detect the edge of the original image. |