Presentation 4 Zach Robertson

Our method Pedro’s method Low threshold, false positive Low threshold, no false positive High threshold, false negative

Head Detector Our method Pedro’s Method

Train Human Model in 3D We need a good descriptor for depth as good as HOG for RGB What should we use for Depth?

Papers Invariant Surface Characteristics for 3d Object Recognition by Besl and Jain Mean curvature and Gaussian Curvature as visible invariant

Gaussian Curvature Mean Curvature Gives where surface is convex, saddle, or flat Indicates surface shape at a pixel Mean Curvature The average of the principal curvatures If zero, minimal surface

Coded Produce normal vectors Produce mean curvature Produce gaussian curvature

Train SVM There are 9 different possibilities Only 8 will actually happen Created a histogram of curvature

Noise

Normal and Curvatures Norm in Z direction Norm in X direction Norm in Y direction Mean Curvature Gaussian Curvature

Fixing Noise Use the median to smooth Save images in lossless format (such as .png) Changing the range of values from 0 to 255 to 0 to 4000 Allows more detail to be maintain

Median Smoothed Gaussian Smoothed