“Sparse PDF maps for non-linear multi-resolution image operations” by Hadwiger, Sicat, Beyer, Krüger and Möller
Conference:
Type(s):
Title:
- Sparse PDF maps for non-linear multi-resolution image operations
Session/Category Title: Operating on Images
Presenter(s)/Author(s):
Abstract:
We introduce a new type of multi-resolution image pyramid for high-resolution images called sparse pdf maps (sPDF-maps). Each pyramid level consists of a sparse encoding of continuous probability density functions (pdfs) of pixel neighborhoods in the original image. The encoded pdfs enable the accurate computation of non-linear image operations directly in any pyramid level with proper pre-filtering for anti-aliasing, without accessing higher or lower resolutions. The sparsity of sPDF-maps makes them feasible for gigapixel images, while enabling direct evaluation of a variety of non-linear operators from the same representation. We illustrate this versatility for antialiased color mapping, O(n) local Laplacian filters, smoothed local histogram filters (e.g., median or mode filters), and bilateral filters.
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