Color Plane Interpolation for Digital Cameras

1
Color Plane Interpolation for Digital Cameras

• George Burdell V
• Center for Signal and Image Processing
• Georgia Institute of Technology

2
Outline

• Introduction
• Problem definition
• Proposed solution
• Performance evaluation
• Conclusions

3
Digital Cameras

• Advantages
• See the picture instantly
• Download to computer
• Edit your pictures
• Share on the web
• Disadvantages
• Have limited resolution
• Can produce color artifacts

4
Digital Cameras
Sensors
5
Demosaicing Problem

Color Filter Array
6
Demosaicing Problem

• Observations
• Color channels are highly correlated.
• Green channel is sampled more densely.

7
Demosaicing Problem

• Implications
• Red and blue channels lose more information than
  the green channel.
• Interpolation of the red and blue channels is the
  limiting factor in performance.
• Green channel can be used to retrieve the lost
  information.

8
Demosaicing Problem

• Solution An iterative algorithm based on
  projection onto convex sets (POCS) technique.
• Find the correlation between the color channels.
• Use this correlation to estimate the missing
  samples.
• Correct the estimates using the observed samples.

9
Performance
10
Performance
11
Performance
Original
Patent 5,629,734
Proposed
12
Performance
Original
Patent 5,629,734
Proposed
13
Conclusions

• The proposed method
• Utilizes the color correlation effectively.
• Provides significant improvement in image
  quality.
• Has low computational complexity.