how to convert the rgb in to gray for this code?
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% Create a detector object faceDetector = vision.CascadeObjectDetector; % Read input image [basefilename, pathname ] = uigetfile({'*.jpg';'*.png';'*.bmp'},'File selector'); filename= fullfile(pathname, basefilename); I = imread(filename);
% Detect faces bbox = step(faceDetector, I); disp(bbox); % Create a shape inserter object to draw bounding boxes around detections shapeInserter = vision.ShapeInserter('BorderColor','Custom','CustomBorderColor',[255 255 0]);
% Draw boxes around detected faces and display results I_faces = step(shapeInserter, I, int32(bbox)); figure, imshow(I_faces), title('Detected face');
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