Assignment 3 Camera Simulation
Murad Akhter
Date submitted: 11th May 2006
Code emailed: 11th May 2006
Compound Lens Simulator
Description of implementation approach and comments
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Final Images Rendered with 512 samples per pixel
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My Implementation |
Reference |
Telephoto |
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Double Gausss |
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Wide Angle |
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Fisheye |
Final Images Rendered with 4 samples per pixel
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My Implementation |
Reference |
Telephoto |
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Double Gausss |
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Wide Angle |
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Fisheye |
Experiment with Exposure
Image with aperture full open |
Image with half radius aperture |
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Observation and Explanation
As is easy to see, the image on the right is dimmer once the aperture size is reduced. The exposure of the image depends on the number of rays that can pass through the lens system unobstructed. Reducing the aperture size by half reduces the area rays can pass through by a quarter. This equals 2 f-stops since one stop corressponds to halving of the light intensity from the previous stop.
Autofocus Simulation
Description of implementation approach and comments
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Final Images Rendered with 512 samples per pixel
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Adjusted film distance |
My Implementation |
Reference |
Double Gausss 1 |
mm |
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Double Gausss 2 |
mm |
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Telephoto |
mm |
Extras
Stopping Down the Telephoto Lens
Image with aperture full open |
Image with quarter diameter aperture |
Exposure increased by 4-stops in Photoshop |
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I reduced the aperture to 1/4 th its original value to observe a 4-stop change in exposure. Increasing the exposure in Photoshop gave an image that seemed similar to the original. The reduced aperture size causes the images to be noisier since fewer rays end up making it to the scene from the camera. This is easy to see when comparing the Photoshop image with the original image on the leftmost column.
...... Go ahead and drop in any other cool images you created here .....