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SVM Parameters ?

Hi, I am trying to classify 4 different Human actions based on their 7 Humoments using SVM. So far detection isn't really working so well and everything is being detected as one particular action.

I'm wondering if anyone has any suggestions on how to improve this possibly in terms of the SVM parameters. I'm currently using the following:

//Setup training parameters
CvSVMParams params;
params.svm_type = CvSVM::C_SVC;
params.kernel_type = CvSVM::RBF;
params.term_crit = cvTermCriteria(CV_TERMCRIT_ITER, 100, 1e-6);


Thanks