使用simpleBlobDetector进行对象检测，但它不起作用

I have a problem with the code for the simpleBlobDetector. I can build and run all the code just fine, but the blobs that the program detects are only the size of a pixel or so. I've already tried to change the param.minArea and maxArea but it doesn't work. So Im asking you guys for help. By the way the image i was using is in grayscale already so it isn't because of my threshold command that it isn't working. Thanks before hand!I have a problem with the code for the simpleBl