使用 OpenCV 和 Python 保存多个图像
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/17119544/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Save multiple images with OpenCV and Python
提问by ng150716
I'm using OpenCV and Python to take images. However currently I can only take one picture at a time. I would like to have OpenCV to take multiple pictures. This is my current code.
我正在使用 OpenCV 和 Python 来拍摄图像。但是目前我一次只能拍一张照片。我想让 OpenCV 拍摄多张照片。这是我目前的代码。
import cv2.cv as cv
import time
cv.NamedWindow("camera", 1)
capture = cv.CaptureFromCAM(0)
while True:
img = cv.QueryFrame(capture)
cv.ShowImage("camera", img)
cv.SaveImage('pic.jpg', img)
if cv.WaitKey(10) == 27:
break
采纳答案by falsetru
Your code overwrite a file. Save to different file each time. For example:
您的代码覆盖文件。每次保存到不同的文件。例如：
import cv2.cv as cv
import time
cv.NamedWindow("camera", 1)
capture = cv.CaptureFromCAM(0)
i = 0
while True:
img = cv.QueryFrame(capture)
cv.ShowImage("camera", img)
cv.SaveImage('pic{:>05}.jpg'.format(i), img)
if cv.WaitKey(10) == 27:
break
i += 1
回答by Vipul
change the name of the image to be saved to " [image name] [a number which increase after every loop] " By doing this your image will be stored with a new name after every loop.. otherwise all the images will overwrite the same name !
将要保存的图像名称更改为“[图像名称] [每次循环后增加的数字]”这样做，您的图像将在每次循环后以新名称存储..否则所有图像都将覆盖相同的名称姓名 ！
import cv2.cv as cv
import time
cv.NamedWindow("camera", 1)
capture = cv.CaptureFromCAM(0)
num = 0
while True:
img = cv.QueryFrame(capture)
cv.ShowImage("camera", img)
cv.SaveImage('pic'+str(num)+'.jpg', img)
if cv.WaitKey(10) == 27:
break
num += 1
now your images will be saved as pic0.jpg, pic1.jpg, pic2.jpg and so on..
现在你的图片将被保存为 pic0.jpg、pic1.jpg、pic2.jpg 等等..
回答by ksamak
A minimal example of what you'd like to do, based on the c++ binded interface.
您想要做什么的最小示例，基于 c++ 绑定接口。
import cv2
cpt = 0
maxFrames = 5 # if you want 5 frames only.
try:
vidStream = cv2.VideoCapture(0) # index of your camera
except:
print "problem opening input stream"
sys.exit(1)
while cpt < maxFrames:
ret, frame = vidStream.read() # read frame and return code.
if not ret: # if return code is bad, abort.
sys.exit(0)
cv2.imshow("test window", frame) # show image in window
cv2.imwrite("image%04i.jpg" %cpt, frame)
cpt += 1
A full example of script, able to read from a camera index, or a file. Includes some failsafes and some information about read device.
一个完整的脚本示例，能够从相机索引或文件中读取。包括一些故障保护和有关读取设备的一些信息。
usage: record.py [source] [target folder]
用法：record.py [源] [目标文件夹]
#!/usr/bin/env python
import cv2
import sys
import os
cpt = 0
maxFrames = 30
try:
targetDir = sys.argv[2]
except:
targetDir = "" # if no argument, then use current directory
try: # read input. eval if to transform video index to int
vidStream = cv2.VideoCapture(eval(sys.argv[1]))
except:
print "problem opening input stream"
sys.exit(1)
if not vidStream.isOpened():
print "capture stream not open"
sys.exit(1)
# informations in case the input is a video file.
nFrames = vidStream.get(cv2.cv.CV_CAP_PROP_FRAME_COUNT)
print "frame number: %s" %nFrames
fps = vidStream.get(cv2.cv.CV_CAP_PROP_FPS)
print "FPS value: %s" %fps
# note that we could use frame number here, or "while 1"
# so we could read from a live written file or capture devide.
while cpt < maxFrames:
ret, frame = vidStream.read() # read frame and return code.
if not ret:
print "end of stream"
sys.exit(0)
cv2.imshow("test window", frame) # show image in window
cv2.imwrite(os.path.join(targetDir, "image_%04i.jpg" %cpt), frame)
cpt += 1
keyPressed = cv2.waitKey(1) # time to wait between frames
if keyPressed != -1: # if user pressed a key, stop recording.
sys.exit(0)
回答by nima farhadi
i think this wil helpful...
我认为这会有所帮助...
import cv2
vid = cv2.VideoCapture("video.mp4")
d = 0
ret, frame = vid.read()
while ret:
ret, frame = vid.read()
filename = "images/file_%d.jpg"%d
cv2.imwrite(filename, frame)
d+=1
this will save every frame with different name.
这将用不同的名称保存每一帧。
