Reference to non-existent field 'BoundingBox'. Error in findVehicle (line 10) bboxes = regions.BoundingBox; can anyone explain?

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

Answer 1

[Walter Roberson]

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

[Abdullah Lafir]

function [BW_out,properties] = filterRegions(BW_in)

BW_out = BW_in;

% Fill holes in regions.

BW_out = imfill(BW_out, 'holes');

% Filter image based on image properties.

BW_out = bwpropfilt(BW_out, 'Area', [5000 + eps(5000), Inf]);

% Get properties.

properties = regionprops(BW_out, {'Area', 'Eccentricity', 'EquivDiameter', 'EulerNumber', 'MajorAxisLength', 'MinorAxisLength', 'Orientation', 'Perimeter'})

I am trying to replicate the same code which is provided in the above link to see how it works, but unfortunately i keep on getting this error

[Walter Roberson]

properties = regionprops(BW_out, {'Area', 'Eccentricity', 'EquivDiameter', 'EulerNumber', 'MajorAxisLength', 'MinorAxisLength', 'Orientation', 'Perimeter', 'BoundingBox'})