Plot on top of a Live Image Preview
Hello, I am trying to plot a few points on top of a live image preview, but my code returns an error of "Line cannot be a child of Image." Does anyone know of a way to plot on top of a Live Image, similar to the imageMarker function? vidRes1 = handles.vid1.VideoResolution; imWidth1 = vidRes1(1); imHeight1 = vidRes1(2); nBands1 = handles.vid1.NumberOfBands; hImage = image(zeros(imHeight1, imWidth1, nBands1), 'Parent', handles.axes1); preview(handles.vid1, hImage); plot(hImage, 250, 300, 'bo'); Thanks,
Kshitij Singh answered .
2025-11-20
This approach might work for you:
vid = videoinput('winvideo', 1);
vidInfo = imaqhwinfo(vid);
vidRes = vid.VideoResolution;
imWidth = vidRes(1);
imHeight = vidRes(2);
numBands = vid.NumberOfBands;
hFig = figure;
hAxes = axes(hFig);
hImage = image(hAxes, zeros(imHeight, imWidth, numBands, vidInfo.NativeDataType));
preview(vid, hImage);
hLine = line(hAxes, round([0.25*imWidth, 0.75*imWidth]),...
round([0.5*imHeight, 0.5*imHeight]),...
'Marker', 'o',...
'LineStyle', 'none');