Google HDR+ Image Processing Pipeline
Introduction
Smartphone cameras have evolved and improved a lot over the past decade. Nowadays, a lot of photography is performed using smartphone. However, small apertures and small sensor pixels of smartphone cameras normally lead to noisy images in low light and limited dynamic range. To fix these issues, Google proposes a complete computational photography pipeline which captures, aligns and merges a burst of frames to reduce noise in low-light setting and also increase dynamic range.
Background
Methods and Implementation
Alignment
L1 and L2 Brute Force
Fast L2
Merge
Simple Merge Algorithm
Robust Merge Algorithm
Results
Our Result vs. Google's HDR+ Result
Shifts and Rotations
Noise
Conclusions
Appendix
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