Unresolved external symbol error in openCV

Question

I am a beginner in openCV. I have been trying out face detection and recognition in Windows platform. I have integrated different pieces of codes. I am also using PCA method to recognize the faces.I am getting an error like below,

Error 1 error LNK1120: 2 unresolved externals Error 2 error LNK2019: unresolved external symbol _cvCalcEigenObjects referenced in function "void __cdecl doPCA(void)" (?doPCA@@YAXXZ) Error 3 error LNK2019: unresolved external symbol _cvEigenDecomposite referenced in function "void __cdecl learn(char *)" (?learn@@YAXPAD@Z)

can someone please resolve.,..

which development environment are you using? Have you linked to the opencv lib file ? — TomP89, Feb 07 '12 at 09:03
Ya I Have Linked all lib files... the demo Program of displaying sample images kind of programme works fine.. — Keerthan Tantry, Feb 07 '12 at 09:11
under project properties - Linker - General, are the "Additional Library Directories" setup correctly ? That's assuming your not using the full path to the library under the Linker -Input tab — TomP89, Feb 07 '12 at 09:28
I have specified the OpenCv lib location..I am getting error in a function that calls cvCalcEigenObjects and cvEigenDecomposite ..Is it defined in any specific header? — Keerthan Tantry, Feb 07 '12 at 10:00
hi keerthan have u solved this error? i seem to have the same error.. how to solve it... — lakshmen, Mar 02 '12 at 20:57

score 0 · Accepted Answer · edited Sep 09 '12 at 09:58

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As you are saying that you are using VS and the demo programs of displaying images works fine.Maybe you have just added few lib files in Additional Dependencies.Go on add some more required for the function.Also it seems you want to try out PCA on your data.please see the documentation of PCA at http://opencv.itseez.com/modules/core/doc/operations_on_arrays.html?highlight=pca#PCA.And if you want some really working code visit this page. The set of input can of different database but must be gray scale and resized to same size.

edited Sep 09 '12 at 09:58

George

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answered Feb 07 '12 at 17:16

Abhishek kumar

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For PCA related see stack question http://stackoverflow.com/questions/8938207/how-is-pca-implemented-on-a-camera-captured-image – Abhishek kumar Feb 07 '12 at 17:21
cv210d.lib cxcore210d.lib highgui210d.lib ml210d.lib opencv_ffmpeg210.lib these are the lib files I have added in additional dependencies.Is it not fine? – Keerthan Tantry Feb 07 '12 at 18:17
i think you should add imgproc210d.lib,objdetect210d.lib in addition.btw i am using opencv 2.3 and has just checked the code at the blog.it really works.if you find some unhandled exception just check check your input has been properly preprocessed. – Abhishek kumar Feb 07 '12 at 18:26
I just checked my lib folder of OpenCV2.1 which i have installed and been working on , I m not finding the above two .lib files you specified! – Keerthan Tantry Feb 07 '12 at 19:01
I downloaded all versions of OpenCV . But i am never finding imgproc210d.lib,objdetect210d.lib files any where. Please suggest me the way to get those files. – Keerthan Tantry Feb 08 '12 at 05:42
i told you i use OpenCv 2.3.1.There are these files.But i can't tell you about OpenCv2.1.If you have just started better download Opencv 2.3.1 – Abhishek kumar Feb 09 '12 at 07:27

Unresolved external symbol error in openCV

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