Capturing a single image from my webcam in Java or Python

Question

I want to capture a single image from my webcam and save it to disk   I want to do this in Java or Python  preferably Java    I want something that will work on both 64-bit Win7 and 32-bit Linux   EDIT  I use Python 3 x  not 2 x  Because everywhere else I see this question asked people manage to get confused  I m going to state a few things explicitly    I do not want to use Processing I do not want to use any language other than those stated above I do want to display this image on my screen in any way  shape or form I do not want to display a live video feed from my webcam on my screen  or save such a feed to my hard drive The Java Media Framework is far too out of date  Do not suggest it  I would rather not use JavaCV  but if I absolutely must  I want to know exactly which files from the OpenCV library I need  and how I can use these files without including the entire library  and preferably without sticking these files in any sort of PATH  Everything should be included in the one directory  I can use Eclipse on the 64-bit Win7 computer if need be  but I also have to be able to compile and use it on 32-bit Linux as well If you think I might or might not know something related to this subject in any way shape or form  please assume I do not know it  and tell me   EDIT2  I was able to get Froyo s pygame example working on Linux using Python 2 7 and pygame 1 9 1   the pygame camera camera list   call didn t work  but it was unnecessary for the rest of the example   However  I had to call cam set controls    for which you can find the documentation here http   www pygame org docs ref camera html  to up the brightness so I could actually see anything in the image I captured   Also  I need to call the cam get image   and pygame image save   methods three times before the image I supposedly took on the first pair of calls actually gets saved   They appeared to be stuck in a weird buffer   Basically  instead of calling cam get image   once  I had to call it three times every single time I wanted to capture an image   Then and only then did I call pygame image save     Unfortunately  as stated below  pygame camera is only supported on Linux   I still don t have a solution for Windows

User · Answer

I wrote a tool to capture images from a webcam entirely in Python, based on DirectShow. You can find it here: https://github.com/andreaschiavinato/python_grabber.

You can use the whole application or just the class FilterGraph in dshow_graph.py in the following way:

from pygrabber.dshow_graph import FilterGraph
import numpy as np
from matplotlib.image import imsave

graph = FilterGraph()
print(graph.get_input_devices())
device_index = input("Enter device number: ")
graph.add_input_device(int(device_index))
graph.display_format_dialog()
filename = r"c:\temp\imm.png"
# np.flip(image, axis=2) required to convert image from BGR to RGB
graph.add_sample_grabber(lambda image : imsave(filename, np.flip(image, axis=2)))
graph.add_null_render()
graph.prepare()
graph.run()
x = input("Press key to grab photo")
graph.grab_frame()
x = input(f"File {filename} saved. Press key to end")
graph.stop()

User · Answer

import cv2 camera   cv2 VideoCapture 0  while True      return value image   camera read       gray   cv2 cvtColor image cv2 COLOR BGR2GRAY      cv2 imshow  image  gray      if cv2 waitKey 1  amp  0xFF    ord  s            cv2 imwrite  test jpg  image          break camera release   cv2 destroyAllWindows

User · Answer

It can be done by using ecapture First  run  pip install ecapture   Then in a new python script type       from ecapture import ecapture as ec      ec capture 0  test   img jpg     More information from thislink

User · Answer

Some time ago I wrote simple Webcam Capture API which can be used for that  The project is available on Github   Example code   Webcam webcam   Webcam getDefault    webcam open    try     ImageIO write webcam getImage     PNG   new File  test png       catch  IOException e      e printStackTrace      finally     webcam close

User · Answer

On windows it is easy to interact with your webcam with pygame   from VideoCapture import Device cam   Device   cam saveSnapshot  image jpg     I haven t tried using pygame on linux  all my linux boxen are servers without X   but this link might be helpful http   www jperla com blog post capturing-frames-from-a-webcam-on-linux

User · Answer

thebjorn has given a good answer  But if you want more options  you can try OpenCV  SimpleCV  using SimpleCV  not supported in python3 x   from SimpleCV import Image  Camera  cam   Camera   img   cam getImage   img save  quot filename jpg quot    using OpenCV  from cv2 import     initialize the camera cam   VideoCapture 0      0 - gt  index of camera s  img   cam read   if s       frame captured without any errors     namedWindow  quot cam-test quot  CV WINDOW AUTOSIZE      imshow  quot cam-test quot  img      waitKey 0      destroyWindow  quot cam-test quot       imwrite  quot filename jpg quot  img   save image  using pygame  import pygame import pygame camera  pygame camera init   pygame camera list cameras    Camera detected or not cam   pygame camera Camera  quot  dev video0 quot   640 480   cam start   img   cam get image   pygame image save img  quot filename jpg quot    Install OpenCV  install python-opencv bindings  numpy  Install SimpleCV  install python-opencv  pygame  numpy  scipy  simplecv  get latest version of SimpleCV Install pygame  install pygame

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