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Having a trouble using the "VLIB_trackFeaturesLucasKanade_7x7" function of VLIB 2.0

Hello. 

Currently, I develop a computer vision algorithm using VLIB of TI on visual studio 2010 on PC. 

The problem is the bad result of optical flow function. 

To perform optical flow, I input two successive image frames. and 1) Smooth filtering, 2) Find gradient, 3) Find Harris corner (VLIB_harrisScore_7x7, VLIB_nonMaxSuppress_7x7_S16).

And then, I check the output data of VLIB_nonMaxSuppress_7x7_S16. If this value is non-zero, it means it is the Harris corner, right ? 

Below is the source of find feature point list for optical flow. 

After find the feature point list, I call the optical flow function like as below. 

// *************** Optical Flow *********************
VLIB_trackFeaturesLucasKanade_7x7(IMG1, IMG2, GradX, GradY, Width, Height, FeatureCount, X_Coord, Y_Coord, X_Out, Y_Out, 10, BUFFER2);

It can be run very fast. but the result is not right. Maybe some part is wrong. 

I draw several lines on image using IMG1 & IMG2's feature cordinate pairs. 

for (i=0; i<FeatureCount; i++) {
    if ((X_Coord[i] != X_Out[i]) && (X_Out[i]>0) && (Y_Out[i]>0)) {   // Check the feature point is changed or not. 
        DrawLine(ImgD, Width, Height, X_Coord[i], Y_Coord[i], X_Out[i], Y_Out[i]);  // This fuction is drawing a linear line on input image. 
}

The final result can be shown at below link. (small cross mark represents the coordinate point of IMG1)

https://docs.google.com/presentation/d/1pM6_zvxDQY4LKCMsZ7rHjsE8qXecqp9X_n-PQMu3S0Q/edit

And this is the source code's link. 

https://docs.google.com/a/imagenext.co.kr/file/d/0Bz585VYgO0D6YTFjTEQ0UVR5Sms/edit