Introduction to OpenCV

LNMIIT DIP Winter Workshop 2011. Manohar Kuse

INTRODUCTION TO OPENCV


Outline

What is OpenCV Installing Ubuntu Installing OpenCV Coding with OpenCV References for OpenCV


Outline



What is OpenCV

C++ Library for Image Processing and Computer Vision

Developed by Intel Can take advantage of multiple

processors Developed for high performance Support for Web-cam, Microsoft Connect

and other specialized cameras


Linux Vs. Windows

Recommended : Install on Linux NOT Recommended : OpenCV on

Windows


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Installing Linux

http://www.ubuntu.com/download/ubuntu/windows-installer



Installing Linux




Installing Linux




Installing Linux




Installing Linux




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OpenCV Installation Open Synaptic Package Manager


OpenCV Installation Set Proxy


OpenCV Installation Search & Install “opencv-dev”


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Sample Code

Header Files#include <stdlib.h>#include <stdio.h>#include <math.h>#include <cv.h>#include <highgui.h>

Sample code and compilation instructions : Opencv kit for download on “lnmiitdip.wordpress.com”


Sample Code

IplImage* img = 0; Declaration of opencv-image

char * fileName = “file.png”;img=cvLoadImage(fileName);

Load image as a struct


IplImage

Height : img->height Width : img->width Channels : img->nChannels

(Number of channels) Data : img->imageData

(Array of size W x H x nC


Sample Code

Iterate through the IplImage for(i=0;i<height;i++) {

for(j=0;j<width;j++) {for(k=0;k<channels;k++) {

data[i*step+j*channels+k]=255-

data[i*step+j*channels+k]; } }}


Sample Code

cvNamedWindow("mainWin“,CV_WINDOW_AUTOSIZE);

Create a display window

cvShowImage("mainWin", img ); Show Image

cvWaitKey(0); Give delay (Pause)


Links

http://www.cs.iit.edu/~agam/cs512/lect-notes/opencv-intro/opencv-intro.html

OpenCV Introduction:

OpenCV E-Book:

http://opencv.willowgarage.com/wiki/

Official Site:

“Learning OpenCV” By Gary Bradski and Adrian Kaehler

http://www.cs.iit.edu/~agam/cs512/lect-notes/opencv-intro/opencv-intro.html

http://opencv.willowgarage.com/wiki/


Download

Download “OpenCV Kit” – lnmiitdip.wordpress.com

Contains Instruction for compilation Sample code Video dataset


Thanks

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Introduction to OpenCV

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