View
216
Download
0
Tags:
Embed Size (px)
Citation preview
1
Learning to Detect Natural Image Boundaries
David Martin, Charless Fowlkes, Jitendra Malik
Computer Science Division
University of California at Berkeley
2
Goal: A Computational Model of Vision
1. Image Segmentation– Parsing, from pixels to regions
Rocks
Ice
Penguin
Shadow
Wing
2. Object Recognition– Grouping and labeling of regions
3
An Empirical Approach
• Use 1000 images, each segmented by 10 human subjects in order to establish ground truth
• Evaluate hundreds of algorithmic design choices based on performance on test data set.
• Calibrate parameters to best match human data.
4
DataflowImage
Optimized CuesPb
Brightness
Color
Texture
Benchmark
Human Segmentations
Cue Combination
Model
5
Boundary Detection Output
Canny 2MM Us HumanImage
6
Summary
• Around 20 processor years worth of experiments (10 – 20 experiments a day, each run on set of 300 images)
• Final product is a boundary detector which outperforms existing methods and matches human performance for the local boundary detection task.