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Super-Resolution from a
Single Image
by Daniel Glasner, Shai Bagon and Michal Irani
Authors
 Daniel Glasner
› B.Sc and M.Sc at Tel Aviv University, Israel.
› Reading for a PhD at The Weizmann Institute of
Science, Israel.
› Web - http://www.wisdom.weizmann.ac.il/~glasner/
 Shai Bagon
› PhD at The Weizmann Institute of Science, Israel.
› Web - http://www.wisdom.weizmann.ac.il/~bagon/
Authors
 Michal Irani
› Professor in Computer Science at The Weizmann
Institute of Science, Israel.
› Research Interests - Computer Vision and Video
Information Analysis
› Web - http://www.wisdom.weizmann.ac.il/~irani/
 The need of Super Resolution
 Main approaches of SR
 Proposed method
 Experimental results of the proposed
method
Outline
Why Super Resolution?
Low Resolution
High Resolution
Resize
 Generating high resolution image
with more resolving power
using one or more low resolution
images.
› more resolving power – more details
What Is Super Resolution?
 Multi image super resolution
 Example based super resolution
Super Resolution Methods
 Several images of the same scenery.
 Each image will have different
information of the same scenery.
Multi Image Super Resolution
 Image database with HR/LR image pairs
 Replace similar LR patches with
corresponding HR patches.
Example Based Super Resolution
+
LR HR
 Combine multi image SR with example
based SR
 Without use external source
Proposed Approach
 5x5 pixel image patches
 More than 60% of image patches have 9
or more recurrences within same scale or
in different scales
Patch Redundancy
 Use patch redundancy in same scale to
model multi image super resolution
problem
 Use patch redundancy in different scales
to model example based super
resolution problem
Proposed Method

Problem Model
L1 L2 L3
H

Problem Model
p
q
 Find similar patches within scale
 Nearest Neighbor
Multi Image to Single Image
How to find cross-scale patch
redundancy?
Finding Similar Patches
I0 = L
I-1
I1 = H
Finding Similar Patches
I0 = L
I-1
I1
I2 = H

Finding Similar Patches
FindNN
I0 = L
I-1
I-2
I1
I2 = H

Finding Similar Patches
Parent
FindNN Parent
I0 = L
I-1
I-2
I1
I2 = H

Finding Similar Patches
Parent
FindNN Parent Copy
I0 = L
I-1
I-2
I1
I2 = H
 RGB YIQ
 Extract Y component (Luminance)
 Apply SR to Y component
 Use interpolation methods to I and Q
components (Chrominance)
 Combine YIQ
Color Images
Experimental Results
Bi-cubic interpolation Proposed Method
LR
Experimental Results
Nearest NeighborProposed Method
LR
Experimental Results
Example BasedProposed Method
LR
Experimental Results
Bi-cubic interpolation Proposed Method
LR
 Two main approaches of Super
Resolution
 Observation about patch redundancy
 Unified approach of Super Resolution
 Experimental results
Summery
 D. Glasner, S. Bagon and M. Irani, "Super-resolution from a single
image," in IEEE 12th International Conference on Computer Vision
(ICCV 2009), Kyoto, Japan, Sep. 29 - Oct. 2, 2009, pp. 349-356.
 http://www.wisdom.weizmann.ac.il/~vision/SingleImageSR.html
 http://cs.brown.edu/courses/csci1950-g/results/final/pachecoj
References
Any Question?
Thank you…

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Super resolution from a single image

Editor's Notes

  1. In the previous case when we using interpolation methods they have no more resolving power than the LR image.How can we have more details than the LR image.
  2. Differencese in angleTime diff
  3. not guaranteed to provide the true (unknown) high resolution details.
  4. Statistically analyzed a large image database to find the redundancy of image patches within the same image
  5. Statistically analyzed a large image database to find the redundancy of image patches within the same image
  6. Statistically analyzed a large image database to find the redundancy of image patches within the same image
  7. Nearest neighbor algorithm
  8. We don’t know the pair