Photography Lesson 2 Pinhole Camera Lenses. The Pinhole Camera.
Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W....
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![Page 1: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/1.jpg)
Accidental pinhole and pinspeck cameras: revealing the scene outside the picture
A. Torralba and W. T. FreemanProceedings of 25 IEEE Conference on
Computer Vision and Pattern Recognition(CVPR 2012)
![Page 2: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/2.jpg)
Outlines
• Pinhole camera• Accidental pinhole image• Anti-pinhole/pinspeck camera• Accidental anti-pinhole image• Applications of accidental images in scenes
![Page 3: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/3.jpg)
Pinhole camera
• How does it work?
![Page 4: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/4.jpg)
Accidental pinhole image
• Unnoticed or misinterpreted as shadows.
![Page 5: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/5.jpg)
Accidental pinhole image
• Windows turns into a pinhole
![Page 6: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/6.jpg)
Accidental Pinhole Camera
• Images are always blurry.• To get sharp image, we need to make small
aperture.• It is unlikely to happen accidentally
![Page 7: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/7.jpg)
Pinspeck Camera
![Page 8: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/8.jpg)
Pinspeck Camera
• Two image: 1) image with whole light rays ;2) image with an occluder;
• The difference of two image.
![Page 9: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/9.jpg)
Accidental Anti-pinhole Camera
• The situation happens quite often, and is always ignored.
• There are two limitations in this phenomenon:– It needs a reference image.– Signal to noise ratio.
![Page 10: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/10.jpg)
Accidental Anti-pinhole Camera
• Use two images or a video to extract referenced image;
• Use temporal integration to improve signal to noise ratio.
![Page 11: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/11.jpg)
Example
• Two different “cameras”
![Page 12: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/12.jpg)
Example
• Two different images
![Page 13: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/13.jpg)
Example
• Two difference image and original view.
![Page 14: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/14.jpg)
Applications of accidental images in scenes
• Seeing what is outside the room• Seeing light source• Seeing the shape of window• Seeing the illumination map in an outdoor
scene
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Seeing what is outside the room
• Light comes from the window of a room• A person walk around in the room.
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Seeing light sources
• A hand as an occluder.
![Page 17: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/17.jpg)
Seeing the shape of window
• The shape of the window modifies the statistics of the intensities seeing on the wall just as a blur kernel changes the statistics of a sharp image.
• This motivates using algorithm from image deblurring to infer the shape of window.
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Seeing the shape of window
![Page 19: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/19.jpg)
Seeing the shape of window
![Page 20: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/20.jpg)
Seeing the illumination map in an outdoor scene
![Page 21: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/21.jpg)
Seeing the illumination map in an outdoor scene
![Page 22: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/22.jpg)
Seeing the illumination map in an outdoor scene
![Page 23: Accidental pinhole and pinspeck cameras: revealing the scene outside the picture A. Torralba and W. T. Freeman Proceedings of 25 IEEE Conference on Computer.](https://reader035.fdocuments.in/reader035/viewer/2022062802/56649e995503460f94b9c85a/html5/thumbnails/23.jpg)
Thank you