Hi,
I work with "Image processing toolbox" and I use a Raspberry Pi as the target device. I would like to deploy an edge detection algorithm to Raspberry and display the result images in each cycle but it gives only a black screen. (I use a camera for the image input.) When I run the algorithm on the host computer and the Raspberry only for I/O ports, the code works well, the camera screen is good and the edge detection part works well, too.
My experiences with the error:
- When I only use the "rgb2grey" command and I comment out the "edge" command, the algorithm works fine, there is no black screen. The greyscale images are shown on the Raspbian.
- When I add the "edge" command and deploy it to Raspberry, I can run the ".elf" file and the program starts, but the camera screen only shows a black screen.
- There is no error message when I deploy the code to the Raspberry, it writes "Succesfully deployment".
- (I tried the algorithm with few more command from "Image processing toolbox", for example, I used the "imfill" command instead of "edge" command, the result were the same, the camera screen were black on the Raspberry.)
What's wrong with these commands, that cause a black screen display?
The code is:
function edgeDetection()
r = raspi('172.%%.%%.%%%','pi','%%%%');
w = webcam(r, 'UVC Camera (046d:0825) (usb-0000:01:00.0-1.3):');
for k = 1:300
img = snapshot(w);
gray_img = rgb2gray(img);
edges = edge(gray_img);
displayImage(r,edges,'Title','Edge Detection');
end
end
I hope that my descrption is clear about the problem.
Thanks for any answer,
Roland
