Error in image processing.

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Massimo Colavita
Massimo Colavita 2015-5-25
编辑： Walter Roberson 2015-5-27
Hello, I made a program with the following code:
I = imread('ppc.png');
corners = detectFASTFeatures(I,'MinContrast',0.1);
J = insertMarker(I,corners,'circle');
imshow(J);
and shows me the following error
Error using vision.internal.detector.fast.parseInputs (line 4)
Expected I to be of size MxN when it is actually size 255x559x3.
Error in detectFASTFeatures>parseInputs (line 97)
params = vision.internal.detector.fast.parseInputs(I, varargin{:});
Error in detectFASTFeatures (line 63)
params = parseInputs(I, varargin{:});
Error in zz (line 2)
corners = detectFASTFeatures(I,'MinContrast',0.1);

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回答（3 个）

Walter Roberson
Walter Roberson 2015-5-25
http://www.mathworks.com/help/vision/ref/detectfastfeatures.html
points = detectFASTFeatures(I) returns a cornerPoints object, points. The object contains information about the feature points detected in a 2-D grayscale input image, I.
You are not passing in a grayscale image, you are passing in a color image.
Dima Lisin
Dima Lisin 2015-5-26
编辑：Dima Lisin 2015-5-26
Hi Massimo,
As Walter pointed out, detectFASTFeatures takes a grayscale image. Please use rgb2gray to convert I to grayscale.
Massimo Colavita
Massimo Colavita 2015-5-26
编辑：Walter Roberson 2015-5-27
Thanks. Another question, I want to detect circles in the image: Why I see the whole picture 3 blank? and How should I apply the function "Strel"?
I = imread('ppc.png');
gr = rgb2gray(I);
level = graythresh(gr);
bw = im2bw(gr, level);
figure, imshow(bw);
title(1)
bw2 = bwareaopen(bw, 200);
figure, imshow(bw2);
title(2)
bw3 = imfill(bw2, 'holes');
figure;
imshow(bw3);
title(3);

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