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PSNR has been calculated between the edge maps calculated from detail subbands as well as between approximation subbands of the original and the distorted images.
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Why are the edge maps injective for all ?
(v) Edge response at the edge points,, : edge response mean and standard deviation computed only at the edge points, as defined by the edge maps. .
The edge maps were then summed across all orientations to obtain a composite map of gradient edges representing the number of orientations for which an edge was present at a given location.
(iv) Edge length, : edge length using the edge map,, where.
The locations and are decided by the edge map.
where and represent the pixels detected as edges and non-edges in the edge map M j, respectively.
In Sobel edge detector, both real edges and blocking artifacts are detected and shown in the edge map.
Figure 12(g) is a manually modified edge from the edge map of Figure 12(f).
Similarly, we associate to each edge mapping between selected node mappings, (i, j ) ↔ (k, l ), (i, j ) ∈ E 1, (k, l ) ∈ E 2, a binary variable y ijkl, such that y ijkl = 1 if the edge mapping is in the alignment and 0 otherwise.
This simplifies the edge map generated later.
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