Developing "True HDR" for the iPhone

1,092 views

Published on

Published in: Technology, Art & Photos
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,092
On SlideShare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
19
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Developing "True HDR" for the iPhone

  1. 1. Developing the “True HDR” app for iPhone
  2. 2. Why HDR? Often, you see a beautiful scene but you cannot capture it on camera. You get the sky but the rest of the picture is too dark...
  3. 3. Why HDR? Or, you get the shadows but the sky is washed out. Your eyes perceive high dynamic range but most cameras have low dynamic range.
  4. 4. Capture what your eyes see, via computational means
  5. 5. Capture what your eyes see, via computational means
  6. 6. A bit of history ● Released in 2009 after Apple introduced the 3GS with “auto-focus” feature. ● At the time, there were several apps with “HDR” in their names but all they did was single-image contrast enhancement. ● Initially version was low-resolution (1 MP); current version supports up to 19 MP. ● Apple’s introduction of built-in HDR in 2010 didn’t kill the app. Not all HDR’s are created equal; many like our results better.
  7. 7. Challenges ● Automatically aligning photos with drastically different exposures ● The merge should be as natural-looking as possible. We don’t want halo artifacts. ● Image processing can need a LOT of memory but memory is a prized resource on mobile ● Doing things fast
  8. 8. The Ups and Downs of App Development Highlights ● Appreciative users ● Was #1 in Japan and #3 in the US, for a short time ● Was inaugural member of Apple’s “App Store Hall of Fame” Setbacks ● 8-month period when updates kept getting rejected by Apple Lessons & Anecdotes
  9. 9. Contact me: Yuanzhen Li yzli@csail.mit.edu Interested in computational photo app projects?

×