It is then low-pass filtered and downscaled, yielding an approximation image ; this image is high-pass filtered to produce the three smaller detail images, and low-pass filtered to produce the final approximation image in the upper-left.

It is then low-pass filtered and downscaled, yielding an approximation image ; this image is high-pass filtered to produce the three smaller detail images, and low-pass filtered to produce the final approximation image in the upper-left.

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