Why I want a gradient camera

@article{Tumblin2005WhyIW,
  title={Why I want a gradient camera},
  author={Jack Tumblin and Amit K. Agrawal and Ramesh Raskar},
  journal={2005 IEEE Computer Society Conference on Computer Vision and Pattern Recognition (CVPR'05)},
  year={2005},
  volume={1},
  pages={103-110 vol. 1}
}
We propose a camera that measures static gradients instead of static intensities. Quantizing sensed intensity differences between adjacent pixel values permits an ordinary A/D converter to measure detailed high contrast (HDR) scenes. We measure alternating 'cliques' of sensors (small groups) that locally determine their own best exposure, and reconstruct the image using a Poisson solver. This intrinsically differential design suppresses common-mode noise, hides and smoothes quantization, and… CONTINUE READING
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