MATLAB Answers

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How do I use my smart phone camera as a webcam in MATLAB?

Asked by Ashish Uthama on 20 Jul 2011
Latest activity Answered by keerthana potharaj on 29 Jan 2019 at 4:55
I have an smartphone device with a camera. I would like to obtain and process this image data in MATLAB.
(Specifically, I have an Android device).

  1 Comment

is there any other solution that make matlab still running in the foreground, I tried this method yet it require the ip cam to run in the foreground i need matlab to be still running for later image processing. Also is it possible to access the smart phone camera using matlab mobile Specifically to iphone camera ?

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14 Answers

Answer by Ashish Uthama on 20 Jul 2011
 Accepted Answer

The general solution would need two parts, one to broadcast the data from the device and another part to read this data into MATLAB.
A specific solution for Android:
  • Install the free IP Webcam app. (Make sure you read the corresponding permissions and understand any security issues therein)
  • Open the app, set the desired resolution (will impact the speed!)
  • Scroll to the bottom and tap on 'Start Server'
  • In the camera preview window, note the url at the bottom of the screen.
  • Open MATLAB and use this code snippet to obtain a live preview window. Note that this uses JPG files for discrete frames, which is probably not the fastest way. The app can stream the video and/or audio in multiple ways.
url = 'http://<ip address>/shot.jpg';
ss = imread(url);
fh = image(ss);
while(1)
ss = imread(url);
set(fh,'CData',ss);
drawnow;
end
Example:
(If you find faster ways/solutions for other devices, post it here!)

  12 Comments

Hola a todos. La propuesta de Ashish Uthama me ha resultado muy bien, el unico detalle es que en la IP se debe agregar el puerto que muestra la imagen en la parte inferior en el dispositivo android.
Saludos.
Hi Prateek..! Just remove all the connection to your PC except the connection of android and your PC. This error is coming because Your PC is trying to connect to other network and your cam is in other network.
how can i save a particular frame as an image from this live feed of video from the phone?

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Answer by Soham Bhattacharyya on 16 May 2016

You can use DroidCam if you are using an android phone. You'll need to install OS Generic Video Interface driver.
Hope it helps. :)

  2 Comments

for anyone that can't find the correct address for droidcam simply connect to droidcam using your browser and click on the i button. It should look like this
http://192.168.1.61:4747/mjpegfeed?640x480
and then
camera = ipcam('http://ipaddress:port/mjpegfeed?640x480')

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Answer by Chirag Gupta on 20 Jul 2011

With the iPhone, using the App suggested by Ashish above (IP Cam), you can achieve the same pretty easily! The code is exactly the same:
url = 'http://<ipaddress>:8020/image.jpg';
ss = imread(url);
fh = image(ss);
while(1)
ss = imread(url);
set(fh,'CData',ss);
drawnow;
end

  5 Comments

Francisco, you'll get a better answer if you ask this as a new question: http://www.mathworks.com/matlabcentral/answers/questions/new
(also look at http://www.mathworks.com/matlabcentral/fileexchange/28512-simple-color-detection-by-hue for example)
is the IP address for the android webcam streaming live video or simply a single image or series of saved images?
hi, please how can i save the video from this function? thank you best regard

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Answer by amro
on 10 May 2014

url=('http://192.168.43.1:8080/shot.jpg?rnd=350264');
hVideoIn = vision.VideoPlayer('Name', 'Final Video');
while(1)
ss=imread(url);
step(hVideoIn,ss)
end

  3 Comments

This works well but i have question that why you did not use IP Camera Image Acquisition? i there any why to use it with ip webcam app
ipcam() was not introduced until R2015a, a year after amro posted their Answer.
Hi Hauder Ali, please can you explain how it work on IP camera Image Acquisition. I new in Matlab. thx

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Answer by PIYUSH KUMAR on 14 Sep 2015

Here's the working code for color detection using android camera:
url = 'http://192.168.0.100:8080/shot.jpg';
framesAcquired = 0;
while (framesAcquired <= 50) % the vedio will work till the 50 video frames, after that the vedio will stop. You can use while(1) for infinite loop
data = imread(url);
framesAcquired = framesAcquired + 1;
diff_im = imsubtract(data(:,:,1), rgb2gray(data)); % subtracting red component from the gray image
diff_im = medfilt2(diff_im, [3 3]); % used in image processing to reduce noise and for filtering
diff_im = im2bw(diff_im,0.18); % convert image to binary image
stats = regionprops(diff_im, 'BoundingBox', 'Centroid'); % measures a set of properties for each connected component in the binary image
drawnow;
imshow(data);
hold on
for object = 1:length(stats)
bb = stats(object).BoundingBox;
bc = stats(object).Centroid;
rectangle('Position',bb,'EdgeColor','b','LineWidth',2)
plot(bc(1),bc(2), '-m+')
end
hold off
end
%stop(vid); % to stop the video
%flushdata(vid); % erase the data video
clear all

  1 Comment

hi PIYUSH KUMAR please this function it's just for a snaphot or video? i would like to have video and save it from my smarphone into matlab. how can I save directly as a AVI video? please help me. thank you

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Answer by Siddhant Baral on 7 Feb 2018

url = "http: // IP /shot.jpg '; ss = imread (url); fh = imagen (ss); mientras que (1) ss = imread (url); conjunto (FH, 'programable CData', ss); drawNow; fin

  0 Comments

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Answer by Amrinder Brar on 25 Mar 2015
Edited by Amrinder Brar on 25 Mar 2015

Is there any simple solution to this problem in iphone(i.e. without having to install any third party apps) ?

Answer by saras
on 1 Jul 2016

I am not sure if this is exactly what you are looking for. However, you can use 'Simulink Support Package for Samsung GALAXY Android Devices' or 'Simulink Support Package for Apple iOS Devices' to access the appropriate smartphone camera. Both these support packages come with a Camera block that allow you to get the Camera data inside MATLAB. You can subsequently connect the Camera block to a Video Viewer block if you would like to visualize the data in Simulink.

  0 Comments

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Edited by Walter Roberson
on 5 Dec 2016

buenas, este programa funciona bien pero no he logrado capturar una imagen a partir de este mismo, como puedo obtener una captura de imagen y almacenarla ?
url = "http: // <dirección IP> /shot.jpg ';
ss = imread (url);
fh = imagen (ss);
mientras que (1)
ss = imread (url);
conjunto (FH, 'programable CData', ss);
drawNow;
fin

  2 Comments

Approximate translation:
Good, this program works fine but I have not managed to capture an image from this same, how can I get an image capture and store it?

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Answer by MARIA JAVED on 4 Feb 2017

can anybody tell me that how we can do face detection through Android phone pls help??? i need that code?

  1 Comment

You would either have to write the code in MATLAB and use MATLAB Coder, or else you would have to create a Simulink model and deploy that to Android.

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Answer by Jonathan berry on 10 Apr 2017

Hello guys,
I keep having this error:
Error using imread (line 350) Can't read URL "http://MY_IP /shot.jpg".
any help will be appreciated

  2 Comments

I have the same issue. Looking for an answer.
You need to replace he "MY_IP " part by your actual IP address, such as http://192.168.0.10/shot.jpg

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Answer by Dilip Dubey on 29 Apr 2018

How can I read other sensors from IP webcam app in Matlab?

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Answer by Beril Sirmacek on 29 Apr 2018

Hi All,
I found out that;
imread('http://MY_IP /shot.jpg');
works only on secured network for me. If I am on a public network, then it gives error.

  2 Comments

How can I extend this to Simulink model? any suggestions?
"On Windows platforms, this parameter supports URLs that point to MMS (Microsoft Media Server) streams."

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Answer by keerthana potharaj on 29 Jan 2019 at 4:55

how do we interface mobile camera for deep learning?
P.S we don't have web cam. pls help us.

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