Image registration, manual control point, FAIL

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Karl 2013-7-22

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/82750-image-registration-manual-control-point-fail

We are trying to use manual selection of control points to align two images. It failed for our image dramatically, while the demo works very well. In order to test it we placed four crosses on our image (using an image editor), then moved the four crosses and resaved as a second image. Then we load the two images into matlab, use the cpselect tool to place four control points (one on each cross). We then use cp2tform to construct a transform structure (it does not return any 'bad' points), finally we use imtransform to transform the second image. When we compare the reuslt is not aligned.

    x = rgb2gray(imread('t1.jpg', 'JPG'));
    y = rgb2gray(imread('t2.jpg', 'JPG'));
    figure;
    imshowpair(x,y,'ColorChannels','red-cyan')
    cpselect(y,x);
    inPtsCorr = cpcorr(y_points,x_points,y,x);
    [tForm, input_points, base_points, input_points_bad, base_points_bad] = cp2tform   (inPtsCorr, x_points, 'similarity');
    tY = imtransform(y, tForm);
    figure;
    imshowpair(x,y,'ColorChannels','red-cyan')
    figure;
    imshowpair(x,tY,'ColorChannels','red-cyan')