edge detection(YCbCr transformation) what should i do??

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jaemin choi 2019-5-11

RGB = imread(fn_get_file);

YCBCR = rgb2ycbcr(RGB);

u = edge(YCBCR,'prewitt');

figure(1); imshow(u);

subplot(2,2,2), imshow(u(:,:,1))

subplot(2,2,3), imshow(u(:,YCbCr:,2))

subplot(2,2,4), imshow(u(:,:,3))

vvvvvvvvvvvvvvvvvvvvvvv error vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv

The following error occurred during use : edge

The first input argument I must be two-dimensional (2d).

error : edge>parse_inputs (line 449)

validateattributes(I,{'numeric','logical'},{'real','nonsparse','2d'},mfilename,'I',1);

error : edge (line 189)

[a,method,thresh,sigma,thinning,H,kx,ky] = parse_inputs(varargin{:});

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