How to tile multiple live camera feeds in one window

answered 2016-05-30 09:20:25 -0600

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it's possible of course

Suppose you are grabbing in cv::Mat m1,m2,m3,m4; that have same size and type

//define the tiled image so that it can contains 4 images
Mat tile
tile = Mat(2*m1.size(),m1.type());

//define 4 ROI where the single images will be copied to
Rect r1,r2,r3,r4;
r1 = Rect(0,0,m1.size());             // top left
r2 = Rect(m1.cols,0,m1.size());       // top right
r3 = Rect(0,m1.rows,m1.size());       // bottom left
r4 = Rect(m1.cols,m1.rows,m1.size()); // bottom right

// Transfer the image into tiled one
m1.copyTo(tile(r1));    m2.copyTo(tile(r2));
m3.copyTo(tile(r3));    m4.copyTo(tile(r4));

cv::imshow("Tiled images", tile);

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Camera feed is live '.avi' video files.I am accessing each cameras one by one. So whether tiling is possible in this scenario.

lm35 ( 2016-05-31 03:29:21 -0600 )edit

Camera feed is live '.avi' video files means you have something like this:

cv::VideoCapture cam1("file1.avi");
...
cv::VideoCapture cam4("file4.avi");

than you easily can do

cam1 >> m1;
...
cam4 >> m4;

than use the code as is in the answer

pklab ( 2016-05-31 05:50:57 -0600 )edit

OpenCV Error: Assertion failed (0 <= roi.x && 0 <= roi.width && roi.x + roi.width <= m.cols && 0 <= roi.y && 0 <= roi.height && roi.y + roi.height <= m.rows) in Mat, file /home/valuser/opencv-2.4.13/modules/core/src/matrix.cpp, line 323 terminate called after throwing an instance of 'cv::Exception' what(): /home/valuser/opencv-2.4.13/modules/core/src/matrix.cpp:323: error: (-215) 0 <= roi.x && 0 <= roi.width && roi.x + roi.width <= m.cols && 0 <= roi.y && 0 <= roi.height && roi.y + roi.height <= m.rows in function Mat Got above error for belo tile setting. (img size = 700x400) r1 = Rect(0,0,2700, 2400) r2 = Rect(original_resized.cols-1,0,2700, 2400);
r3 = Rect(0,original_resized.rows-1,2700, 2400); r4 = Rect(original_resized.cols-1,original_resized.rows-1,2700, 2400

lm35 ( 2016-11-14 03:19:21 -0600 )edit

@lm35 you are using (wrong) number instead of variables. m1.size() and others are not placeholders!!! And if you like numbers you should use 2*700 and not 2700

pklab ( 2016-11-15 12:44:59 -0600 )edit

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