how to read an imagecaptured by webcam
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%webcamlist
cam = webcam('Integrated Webcam');
preview(cam);
closePreview(cam)
img = snapshot(cam);
imshow(img)
%image(img)
clear('cam');
I = imread(img);
srcFiles1 = dir('C:\b\*.bmp');
for j = 1 : length(srcFiles1)
filename1 = strcat('C:\b\',srcFiles1(j).name);
I2 = imread(filename1);
points = detectSURFFeatures(I);
length(points)
points2 = detectSURFFeatures(I2);
length(points2)
[features1, validPoints1] = extractFeatures(I, points);
[features2, validPoints2] = extractFeatures(I2, points2);
indexPairs = matchFeatures(features1, features2);
matchedPoints1 = validPoints1(indexPairs(:, 1), :);
matchedPoints2 = validPoints2(indexPairs(:, 2), :);
showMatchedFeatures(I, I2, matchedPoints1, matchedPoints2, 'montage');
figure;
end
%end
output:
Error using imread>parse_inputs (line 450)
The file name or URL argument must be a character vector.
Error in imread (line 322)
[filename, fmt_s, extraArgs, was_cached_fmt_used] = parse_inputs(cached_fmt, varargin{:});
Error in acquire (line 13)
[X, map] = imread(img);
Error using imread>parse_inputs (line 450)
The file name or URL argument must be a character vector.
Error in imread (line 322)
[filename, fmt_s, extraArgs, was_cached_fmt_used] = parse_inputs(cached_fmt, varargin{:});
Error in acquire (line 13)
[X, map] = imread(img);
i have captured an image using webcam and then am trying to compare this image with the images in the database.why is matlab unable to read image file?
0 Comments
Answers (1)
Cris LaPierre
on 1 Apr 2019
Edited: Cris LaPierre
on 1 Apr 2019
I think the issue here is that img is not a file, but a matrix of pixel values already. You therefore don't need to use imread to read it. It's already been 'read' in.
Try just using I=img;
2 Comments
Cris LaPierre
on 1 Apr 2019
Please share the entire error message. Would be nice to also include a sample image that produces this error.
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