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Real time video retrieve from camera and simultaneous vehicle detection

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Ayush Sharma
Ayush Sharma 2017-7-7
Hello All, I am following the following link, for performing the vehicle detection and the distance measurement over a pre-saved Video! I have though implemented this, but I need to replace the pre-saved video with the real time data from the attached camera!
Now, this is what I am planning to implement: 1: Taking the webcam data and storing it in a variable (Implemented) 2: Taking the snapshot and implementing the process of vehicle detection and distance measurement. (Implemented) 3: Now, I want to process the whole video frame by frame.
Now, The part of the code responsible for showing the video is as follows: (Note: I have omitted the most of the code as they were irrelevant to this question)
while (1)
% Grab a frame of video
frame = snapshot(cam);
% Compute birdsEyeView image
.......
% Detect lane boundary features
.....
% Obtain lane candidate points in vehicle coordinates
........
% Find lane boundary candidates
..........
% Reject boundaries based on their length and strength
........
% Classify lane marker type
......
% Find ego lanes
......
% Find candidate ego boundaries
......
% Detect vehicles
......
% Visualize sensor outputs and intermediate results. Pack the core
% sensor outputs into a struct.
......
% Pack additional visualization data, including intermediate results
...........
snapshot = takeSnapshot(frame, sensor, sensorOut);
end
Display the video frame. Snapshot is taken at timeStamp seconds.
if ~isempty(snapshot)
figure
imshow(snapshot)
end
The error i am receiving is as follows:
Function 'subsindex' is not defined for values of class 'struct'.
Error in Final_Perception (line 379)
frame = snapshot(cam);
Kindly compare this part with the part of the code as mentioned in the link above and help me rectify the error I am making in this.
In case you want, I can post the correct version of the code part used with pre-saved video.
Thank you. Regards

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