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example_of_selectROI.py

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# -*- coding: cp936 -*-

#中文，你懂得

'''

selectROI是contrib模块中的一个内容， 最近新增到opencv

关于如何安装配置contrib模块， 请参见我的安装配置指导

'''

import cv2

#import numpy as np

cap=cv2.VideoCapture(0)

#ret=cap.set(3,1280)

#ret=cap.set(4,720)

cv2.namedWindow('frame',0)

while cv2.waitKey(1)!=27:

ret, frame=cap.read()

#按空格键截图，截图后画框截图

if cv2.waitKey(1)==ord(' '):

(x1,y1,x2,y2)=cv2.selectROI('frame',frame,0,0)

#selectROI输出4个值，是左上顶角的，x，y值， 以及之后的w, h值， 但注意是float需要转换为int

x1=int(x1)

x2=int(x2)

y1=int(y1)

y2=int(y2)

src=frame[y1:y1+y2,x1:x1+x2]

#按回车或空格键，把截出来的图放大充满640x480的屏幕

im=cv2.resize(src, (640, 480), interpolation = cv2.INTER_CUBIC)

cv2.imshow('im',im)

cv2.waitKey(1000)

cv2.imshow('frame',frame)

cap.release()

cv2.destroyAllWindows()