Pedestrian Detection Histograms of Oriented Gradients for Human Detection Navneet Dalal and Bill Triggs CVPR ‘05 Pete Barnum March 8, 2006.

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Presentation transcript:

Pedestrian Detection Histograms of Oriented Gradients for Human Detection Navneet Dalal and Bill Triggs CVPR ‘05 Pete Barnum March 8, 2006

Challenges Wide variety of articulated poses Variable appearance/clothing Complex backgrounds Unconstrined illumination Occlusions Different Scales

Slides from Sminchisescu

Slides from Sminchisescu

Slides from Sminchisescu

Feature Sets Haar wavelets + SVM: Papageorgiou & Poggio (2000) Mohan et al (2001) DePoortere et al (2002) Rectangular differential features + adaBoost: Viola & Jones(2001) Parts based binary orientation position histogram + adaBoost: Mikolajczk et al (2004) Edge templates + nearest neighbor: Gavrila & Philomen (1999) Dynamic programming: Felzenszwalb & Huttenlocher (2000), Loffe & Forsyth (1999) Orientation histograms: C.F. Freeman et al (1996) Lowe(1999) Shape contexts: Belongie et al (2002) PCA-SIFT: Ke and Sukthankar (2004)

Gamma Normalization and Compression Tested with RGB LAB Grayscale Gamma Normalization and Compression Square root Log

centered diagonal uncentered cubic-corrected Sobel

Histogram of gradient orientations -Orientation -Position Weighted by magnitude