![Page 1: Color Vision by Sabina Siddiqi. The idea Simulate the image that is formed on the retina of the human eye BEFORE it reaches the brain](https://reader035.vdocuments.net/reader035/viewer/2022062802/56649e995503460f94b9c7e2/html5/thumbnails/1.jpg)
Color Vision
by Sabina Siddiqi
![Page 2: Color Vision by Sabina Siddiqi. The idea Simulate the image that is formed on the retina of the human eye BEFORE it reaches the brain](https://reader035.vdocuments.net/reader035/viewer/2022062802/56649e995503460f94b9c7e2/html5/thumbnails/2.jpg)
The idea
Simulate the image that is formed on the retina of the human eye BEFORE it reaches the brain
![Page 3: Color Vision by Sabina Siddiqi. The idea Simulate the image that is formed on the retina of the human eye BEFORE it reaches the brain](https://reader035.vdocuments.net/reader035/viewer/2022062802/56649e995503460f94b9c7e2/html5/thumbnails/3.jpg)
What does the eye see?
![Page 4: Color Vision by Sabina Siddiqi. The idea Simulate the image that is formed on the retina of the human eye BEFORE it reaches the brain](https://reader035.vdocuments.net/reader035/viewer/2022062802/56649e995503460f94b9c7e2/html5/thumbnails/4.jpg)
Some facts• "The eyeball is about 1 inch (2.5 cm) in diameter"
• There are 20,000,000 rods and 6,500,000 cones in the eye.
• Out of these 64% detect Red, 32% detect Green, and only 2% detect Blue light.
• Most of the eye has a distribution of both cones and rods except for the fovea centralis, which only contains red and green cones (about 30,000)
• Blue light is detected by cones outside the foveal region and therefore blue objects tend to look more blurry than red or green, creating a dreamy feel to the color blue. Blue cones are also more sensitive than green or red cones.
![Page 5: Color Vision by Sabina Siddiqi. The idea Simulate the image that is formed on the retina of the human eye BEFORE it reaches the brain](https://reader035.vdocuments.net/reader035/viewer/2022062802/56649e995503460f94b9c7e2/html5/thumbnails/5.jpg)
The fovea centralis
• The fovea covers 0.6% of the retina (fovea ~0.3 mm diameter). i.e. only 0.6% of the image formed on the retina is in focus.
• For reference the image the moon forms on the retina is about 2mm in diameter.
![Page 6: Color Vision by Sabina Siddiqi. The idea Simulate the image that is formed on the retina of the human eye BEFORE it reaches the brain](https://reader035.vdocuments.net/reader035/viewer/2022062802/56649e995503460f94b9c7e2/html5/thumbnails/6.jpg)
Color Sensitivity
![Page 7: Color Vision by Sabina Siddiqi. The idea Simulate the image that is formed on the retina of the human eye BEFORE it reaches the brain](https://reader035.vdocuments.net/reader035/viewer/2022062802/56649e995503460f94b9c7e2/html5/thumbnails/7.jpg)
The image on camera
![Page 8: Color Vision by Sabina Siddiqi. The idea Simulate the image that is formed on the retina of the human eye BEFORE it reaches the brain](https://reader035.vdocuments.net/reader035/viewer/2022062802/56649e995503460f94b9c7e2/html5/thumbnails/8.jpg)
![Page 9: Color Vision by Sabina Siddiqi. The idea Simulate the image that is formed on the retina of the human eye BEFORE it reaches the brain](https://reader035.vdocuments.net/reader035/viewer/2022062802/56649e995503460f94b9c7e2/html5/thumbnails/9.jpg)
Rethink fovea size on image
• The size being 0.6% of the image works only with 180 degree field of view
• In these circumstances I decided to approximate the diameter of the moon
![Page 10: Color Vision by Sabina Siddiqi. The idea Simulate the image that is formed on the retina of the human eye BEFORE it reaches the brain](https://reader035.vdocuments.net/reader035/viewer/2022062802/56649e995503460f94b9c7e2/html5/thumbnails/10.jpg)
RGB Channels
![Page 11: Color Vision by Sabina Siddiqi. The idea Simulate the image that is formed on the retina of the human eye BEFORE it reaches the brain](https://reader035.vdocuments.net/reader035/viewer/2022062802/56649e995503460f94b9c7e2/html5/thumbnails/11.jpg)
Clearly something was wrong…
So I had to fix a bug in my code… (Yes it was a +/- error!
![Page 12: Color Vision by Sabina Siddiqi. The idea Simulate the image that is formed on the retina of the human eye BEFORE it reaches the brain](https://reader035.vdocuments.net/reader035/viewer/2022062802/56649e995503460f94b9c7e2/html5/thumbnails/12.jpg)
Better results?
Hard to tell!
![Page 13: Color Vision by Sabina Siddiqi. The idea Simulate the image that is formed on the retina of the human eye BEFORE it reaches the brain](https://reader035.vdocuments.net/reader035/viewer/2022062802/56649e995503460f94b9c7e2/html5/thumbnails/13.jpg)
Try brighter images
![Page 14: Color Vision by Sabina Siddiqi. The idea Simulate the image that is formed on the retina of the human eye BEFORE it reaches the brain](https://reader035.vdocuments.net/reader035/viewer/2022062802/56649e995503460f94b9c7e2/html5/thumbnails/14.jpg)
Better results?
![Page 15: Color Vision by Sabina Siddiqi. The idea Simulate the image that is formed on the retina of the human eye BEFORE it reaches the brain](https://reader035.vdocuments.net/reader035/viewer/2022062802/56649e995503460f94b9c7e2/html5/thumbnails/15.jpg)
Decisions
Area of focus: 0.6% vs approximate visual size of the moon
Cones: 3.3% of nerves are red cones – translates to every 30th pixel OR, every pixel has a percentage of it's red value The border between the fovea and retina is not sharp, since light comes from all directions.Have a gradient so the values don’t fall off from perfect focus to suddenly out of focus making it a gradual shift.
![Page 16: Color Vision by Sabina Siddiqi. The idea Simulate the image that is formed on the retina of the human eye BEFORE it reaches the brain](https://reader035.vdocuments.net/reader035/viewer/2022062802/56649e995503460f94b9c7e2/html5/thumbnails/16.jpg)
Applications
• Possible applications are in perceptual psychology research
• Creating creative and aesthetically pleasing viewpoints in film and photography, and eventually creating realistically "explorable" images which adapt to where your eye is focused.