Introduction to Computer Vision

Lecture 07 Roger S. Gaborski Introduction to Computer Vision Roger S. Gaborski

QUIZ 2

Simple 1 D Averaging Example • 3 point moving average • 5 point moving average

Simple 1 D Averaging Example • 3 point moving average • 5 point moving average • NEED FOR PADDING

Padding an array -- padarray • fp = padarray(f, [r c], method, direction) • f is input image • fp is padded image • [r c] is number of rows and columns to pad f • method and direction – next slide Roger S. Gaborski

Chapter 3 www.prenhall.com/gonzalezwoodseddins Roger S. Gaborski

padarray Example >> f = [1 2; 3 4] f = 1 2 3 4 >> fp = padarray(f, [3 2], 'replicate', 'post') fp = 1 2 2 2 3 4 4 4 3 4 4 4 3 4 4 4 3 4 4 4 Post – pad after the last element in both directions [3 2] – pad 3 rows and 2 columns Roger S. Gaborski

>> fp = padarray(f, [2 1], 'replicate', 'post') fp = 1 2 2 3 4 4 3 4 4 3 4 4 Post – pad after the last element in both directions [2 1] – pad 2 rows and 1 columns Roger S. Gaborski

>> f = [1 2 3; 1 2 3; 1 2 3] f = 1 2 3 1 2 3 1 2 3 >> fp = padarray(f, [2 2], 'symmetric', 'both') fp = ?????? Roger S. Gaborski

>> f = [1 2 3; 1 2 3; 1 2 3] f = 1 2 3 1 2 3 1 2 3 >> fp = padarray(f, [2 2], 'symmetric', 'both') fp = 2 1 1 2 3 3 2 2 1 1 2 3 3 2 2 1 1 2 3 3 2 2 1 1 2 3 3 2 2 1 1 2 3 3 2 2 1 1 2 3 3 2 2 1 1 2 3 3 2 Roger S. Gaborski

Introduction to Computer Vision