使用opencv捕获单张图片 [英] Capture single picture with opencv
本文介绍了使用opencv捕获单张图片的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我已经看过几个关于使用python和opencv从网络摄像头流捕获帧的事情,但是如何使用python和opencv以指定的分辨率捕获一张图片?
import cv
capture = cv.CaptureFromCAM (0)
cv.SetCaptureProperty(capture,cv.CV_CAP_PROP_FRAME_HEIGHT,my_height)
cv.SetCaptureProperty(capture,cv.CV_CAP_PROP_FRAME_WIDTH,my_width)
cv.SetCaptureProperty(capture,cv.CV_CAP_PROP_FORMAT,cv .IPL_DEPTH_32F)
img = cv.QueryFrame(capture)
不要但是知道如何关闭相机。
上述代码的ipython会话示例:
在[1]中:import cv
在[2]中:capture = cv.CaptureFromCAM(0)
在[7]中:img = cv.QueryFrame(capture)
在[8]中:print img.height,img.width
480 640
在[9]中:cv.SetCaptureProperty (CA pture,cv.CV_CAP_PROP_FRAME_HEIGHT,480/2)
Out [9]:1
在[10]中:cv.SetCaptureProperty(capture,cv.CV_CAP_PROP_FRAME_WIDTH,640/2)
Out [10]:1
在[11]中:img = cv.QueryFrame(capture)
在[12]中:print img.height,img.width
240 320
I have seen several things about capturing frames from a webcam stream using python and opencv, But how do you capture only one picture at a specified resolution with python and opencv?
解决方案
Use SetCaptureProperty :
import cv
capture = cv.CaptureFromCAM(0)
cv.SetCaptureProperty(capture, cv.CV_CAP_PROP_FRAME_HEIGHT, my_height)
cv.SetCaptureProperty(capture, cv.CV_CAP_PROP_FRAME_WIDTH, my_width)
cv.SetCaptureProperty(capture, cv.CV_CAP_PROP_FORMAT, cv.IPL_DEPTH_32F)
img = cv.QueryFrame(capture)
Do not know how to close the camera, though.
Example of a ipython session with the above code :
In [1]: import cv
In [2]: capture = cv.CaptureFromCAM(0)
In [7]: img = cv.QueryFrame(capture)
In [8]: print img.height, img.width
480 640
In [9]: cv.SetCaptureProperty(capture, cv.CV_CAP_PROP_FRAME_HEIGHT, 480/2)
Out[9]: 1
In [10]: cv.SetCaptureProperty(capture, cv.CV_CAP_PROP_FRAME_WIDTH, 640/2)
Out[10]: 1
In [11]: img = cv.QueryFrame(capture)
In [12]: print img.height, img.width
240 320
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