MATLAB: Reference to non-existent field ‘BoundingBox’. Error in findVehicle (line 10) bboxes = regions.BoundingBox; can anyone explain

MATLABreference to non-existent field 'boundingbox'

function [bboxes,flow]= findVehicle(frameGray, opticFlow)
% Calculate optical flow
flow = estimateFlow(opticFlow,frameGray);
% Threshold Image
threshImage = ( flow.Magnitude > 4);
%Find Connected components and filter regions
[BW_out,regions] = filterRegions(threshImage);
if(size(regions) > 0)
bboxes = regions.BoundingBox;
else
bboxes = [];
end
end

Best Answer

Please show the output of
which -all filterRegions
filterRegions does not appear to be part of any toolbox. It appears to be only part of one particular MATLAB demo https://www.mathworks.com/matlabcentral/fileexchange/57116-deep-learning-for-computer-vision-demo-code?focused=6805483&tab=function
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