Distance from image center to the surface of an object in the image

Question

AUWAL ABUBAKAR 2019-10-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/485148-distance-from-image-center-to-the-surface-of-an-object-in-the-image

回答： Sid Singh 2019-10-22

CTimage.jpg

Hello everyone.

Could please someone help me on how to measure perpendicular distance from the center of the image to surface of the object?

Attched is the sample of my image. i would like to measure the distacne from the image center at the level of the sternum (a) to the chest surface (b)

I worked out the image center as follows:

I = imread('CTimage.jpg');

[row,col,numberOfChannels] = size(I) ;

[X,Y] = meshgrid(1:col,1:row) ;

center = [mean(X(:)) mean(Y(:))] ;

the pixel coodinate at image center is = [295 288.5]

so i want to measure from the same horizontal level but at the level of the sternum above, point a with pixel coordinate [174 288.5] to the chest surface, point b corrsponding to coodiante [174 'unknown'].

Thanks for your kind assistance