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I want to detect features of image 16 into rest 15 images..?

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Nimisha
Nimisha 2015-3-18
关闭： MATLAB Answer Bot 2021-8-20
clc ; % clearing the command window
n = 15;
intervel = 1;
photosave = 'y';
disp('Please wait...');
outputFolder = fullfile(cd);
if ~exist(outputFolder, 'dir')
mkdir(outputFolder);
end
a = imaqhwinfo;
[camera_name, camera_id, format] = getCameraInfo(a);
obj = videoinput(camera_name, camera_id, format);
set(obj, 'FramesPerTrigger', Inf);
set(obj, 'ReturnedColorspace', 'rgb')
vid.FrameGrabInterval = 5;
start(obj)
%obj = videoinput('winvideo',1);
preview(obj);
for i=1:n
img=getsnapshot(obj);
image(img);
if(photosave == 'y')
outputBaseFileName = sprintf('%d.jpg',i);
outputFullFileName = fullfile(outputFolder, outputBaseFileName);
imwrite(img,outputFullFileName,'jpg');
end
pause(intervel);
d = dir('*.jpg');
n = length(d);
for imageNumber = 1:(n+0)
myFunction(imageNumber)
end
end
closepreview;
stop(obj)
disp('The program successfully taken the photos');
disp('Done.');
function [] = myFunction(imageNumber)
I2 = imread(sprintf('%d.jpg',imageNumber));
I2 = I2(:,:,3);
I1 = imread('16.jpg');
I1 = I1(:,:,3);
points1 = detectHarrisFeatures(I1);
points2 = detectHarrisFeatures(I2);
[features1, valid_points1] = extractFeatures(I1, points1);
[features2, valid_points2] = extractFeatures(I2, points2);
[features1, valid_points1] = extractFeatures(I1, points1);
[features2, valid_points2] = extractFeatures(I2, points2);
indexPairs = matchFeatures(features1,features2)
matched_points1 = valid_points1(indexPairs(:,1),:);
matched_points2 = valid_points2(indexPairs(:,2),:);
figure; showMatchedFeatures(I1, I2, matched_points1, matched_points2);
I have written a code to detect features of image 16 into remaining 15 images.! But i am getting a following error.
Undefined function or variable "indexPairs".
Error in myFunction (line 13)
matched_points1 = valid_points1(indexPairs(:,1),:);
Error in TrialProg (line 32)
myFunction(imageNumber)
I am using Matlab R2013a
How to solve an error..?

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回答（2 个）

Image Analyst
Image Analyst 2015-3-18
Well, what values did you think indexPairs would have? You never assigned any values to it before you tried to use it, so it won't have any.
  4 个评论
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Dima Lisin
Dima Lisin 2015-3-18
Hi Nimisha,
indexPairs should be the output of the matchFeatures function.
  2 个评论
Dima Lisin
Dima Lisin 2015-3-19
Is it the error about the memory for the incoming frame? Are you running on 32-bit windows? How big is your video frame?
There are several things you can do:
  • Use a 64-bit machine
  • Make sure that the frame data type is set to uint8
  • Set the camera to use lower resolution

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