Excise 3.2 Matric Operation

Excise 3.2 

2010-07-27

2. Th is exercise will accustom you to the idea of many functions taking matrix types.Create a two-dimensional matrix with three channels of type byte with data size100-by-100. Set all the values to 0.

a. Draw a circle in the matrix using void cvCircle( CvArr* img, CvPoint center,intradius, CvScalar color, int thickness=1, int line_type=8, int shift=0 ).

b. Display this image using methods described in Chapter 2.

 

#！/usr/bin/env pythonfrom opencv.cv import *from opencv.highgui import *#Create Matricmat=cvCreateMat(100,100,CV_8UC3) #Set to be 0cvSetZero(mat) #Set Valuecv.Set(mat, 1.0)mat[3,1]+=88#print matric elementmat[3,1]print [mat[3,i] for i in range(5)]#Getsubrectsub = cvGetSubRect(img, (60, 70, 32, 32))#Draw Circle: cvCircle( CvArr* img, CvPoint center, intradius, CvScalar color, int thickness=1, int line_type=8, int shift=0 )cvCircle(mat,(49,49),10,(25,45,35))#Save ImagecvSaveImage("Circle.png",mat)