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Archive for July, 2009

Color from a Black & White Camera

July 7th, 2009 Comments off
This is the first color image produced by the new camera & lens combination. The bilinear rectification routine that we completed last week was automatically applied to correct chromatic aberration.  In the future bicubic interpolation will make the image even sharper.  The original 16-bit image had levels and curves adjusted in Photoshop, and the result was converted to the 8-bit JPG below. door-rgb-goodexposure

Interpolation: Bilinear vs Bicubic

July 5th, 2009 Comments off
Stereo reconstruction works by identifying similar features within two images, and we will use any technique that enhances small features.  As a first step in our stereo reconstruction pipeline we currently use bilinear interpolation to rectify/dewarp images.  While bilinear interpolation is easy to code and does a good job, there are many other types of interpolation worth considering. The two images below have been modified with bicubic interpolation and bilinear interpolation. The results confirm that bicubic is sharper, so we will eventually migrate to bicubic interpolation. bilinear-vs-bicubic Wikipedia has some more examples.