can anyone provide a code for converting 2d point into 3d cordinate system

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praveen rai 2017-9-13

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评论： Rik 2017-9-15

i want to map the 2d point into 3d cordinate usinf direct linear transformation algo(DLT) or using homography I am not sure how to do or which method shd i do I want the code with brief xplanation for eg i have (x1,y1),(x2,y2)...x and y denote cordinate and with ref to d same point i want in object space i.e (x,y,z) coordinate

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praveen rai 2017-9-15

@ rik Wisselink i guess exactly what u are saying is right.I have used single camera i have the data set can u provide me code for this prob so that i can put the values and get my result or u need the data sets and image.. @image analyst i have accepted his ans for his explanation i didnt get what i want..rik understand my prob just i want from him what he said can he provide me the code

Rik 2017-9-15

You just got upgraded from unintelligible to a case of doit4me. Read those links I gave you and then follow my suggestion from the second comment:

"You should at the very least provide the image you are working on, because that is a very difficult problem, which may not be possible with your data. I have little experience with computer vision, but usually it uses two cameras side by side or a single camera whose movements are known."

I don't know much about computer vision, but if I were you I would start Googling examples until you have something that is close to working. As you know the name from a specific algorithm, I suspect you are in some educational program or course. If that's the case, ask your teacher/instructor for help. It seems you need more than what you can reasonably expect to get here.

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Answer 1

John D'Errico 2017-9-13

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在 MATLAB Online 中打开

Sure. Trivial to do, in fact.

xy2xyz = @(x,y) [x,y,1];

For any value of x and y, this creates a new set of coordinates in the R^3 (x,y,z) domain.

It is a rather boring transformation, but it satisfies the requirements. I suppose you could have done something more exciting. Perhaps...

xy2xyz = @(x,y) [x,y,randn()];

or

xy2xyz = @(x,y) [x,y,x+2*y];

The latter can be written as

xy2xyz = @(x,y) [x,y]*[1 0 1;0 1 2];

Any of infinitely many transformations will exist. What you have not said is what mapping is appropriate.

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praveen rai 2017-9-13

ya u r right.. right word is mapping but dis transformation i dont need i wl find some solution..i want to do with DLT algorithm it contain so many parameters i know d algo but want to implement in matlab

John D'Errico 2017-9-13

But only you know what you want to do. So only you can write the code.

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Answer 2

Image Analyst 2017-9-13

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I don't exactly know what you want, but perhaps you're thinking of colorcloud().

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praveen rai 2017-9-13

no no m not thnkng of color cloud i want 2d coordinates convert into 3d coordinate..let me xplain u know image is 2d plane but d real world is 3d (x,y,z) i.e cartesian plane converts to (x,y) i.e 2d/image plane but i want 2d plane to 3d plane means image plane to cartesian plane..now u got it or still not clear i have also mention d algo name i.e DLT