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    kNN and Entropy in Registration and Model Assessment
    Posted on Thursday, December 15 @ 08:16:31 UTC by admin

    Implementation REVIOSULY we used model indices, which we called Generalisation and Specificity, to assess the quality of appearance models, as well as the quality of non-rigid registration. We have now identified a valuable surrogate to these indices: Shannon's entropy. Some work by Hero et al. is encouraging the use of entropic measures to assess (dis-)similarity of graphs. This is practically used as non-rigid registration similarity measures -- somewhat reminiscent of mutual information (MI).

    We intend to see if an entropic measure of clouds overlap suprasses the performance of Generalisation and Specificity. We also consider image distances that are based on K nearest neighbours (kNN) or the nearest match to a pixel intensity, a map of which is shown below. Since it takes around 20 minutes to generate each of the images below, we consider this to be highly impractical. To run just a single such model evaluation, we would need over 60,000 hours of computer power. And this is 2-D only...

    Extension of our approach to 3-D is foreseen nonetheless. It will probably use the methods which require only a couple of hours of computation in 2-D. Resolution 'pyramiding' (coarse-to-fine approach) can assist in terms of speed.

    Top: original image; Bottom: nearest match to pixel of greyscale value 20, 60, 100 (left-to-right) for each of the other pixels in the image

    Associated Topics

    ExplanationsImplementationTechnical Notes

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    Old Articles
    Wednesday, October 19
    · Registration Assessment Without Ground Truth Proven Most Sensitive
    Thursday, September 15
    · Registration Without Ground-Truth Solution - Proof of Concept/Empirical Evidence
    Friday, September 02
    · FTP Access or a ZIP Archive
    Wednesday, August 24
    · Registration: Tanimoto Overlap and Model-based Evaluation
    Thursday, August 18
    · Specificity, Generalisation and Registration
    Monday, July 25
    · Placing Labels at Strong Edges
    Tuesday, July 19
    · Model Construction and Registration in Medical Imaging
    Thursday, July 14
    · Euclidean Image Distance
    Thursday, July 07
    · Evaluation of Appearance Models
    Tuesday, July 05
    · Parallel Work
    Monday, July 04
    · Label Propagation
    Sunday, July 03
    · Segmentation Propagation from Model
    Friday, July 01
    · Segmentation in Relation to Models and NRR
    · Mean of Squared Differences (MSD) Unstable at Registration
    Thursday, June 30
    · 3-D Surface Visualisation
    · Migration of Code
    · MIAS-IRC and MARS
    Wednesday, June 29
    · Simultaneous Segmentation, Registration and Models
    · Migration from AART to MARS

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