Identifying blobs in image as that of a vehicle

Question

Any idea how I can get the smaller blobs belonging to the same vehicle count as 1 vehicle? Due to background subtraction, in the foreground mask, some of the blobs belonging to a vehicle are quite small, and hence filtering the blobs based on their size won't work.

Answer 1

Try filtering things based on colorDistance() and the comparing the mean color of the blobs in the image with the vehicle against a control image of the background without the car in it. The SimpleCV docs have a tutorial specifically on this topic. That said... it may not always work as expected. Another possibility (just occurred to me) might be summing up the area of the blobs of interest and seeing if that sum is over a given thresh-hold, rather than just any one blob itself.