After downloading edge.jar, please execute it by double-clicking, or typing "java -jar edge.jar".

If the above application does not start, please install OpenJDK from adoptopenjdk.net.

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.

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