How to detect blobs of vehicles on the road?

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>>This is original image

>> blob analysis performed

In my project I want to detect the blobs of the vehicles on the road.The problem with my code is, the blobs of dark colors of the vehicles from the binary image were not detected properly. I wanted to count the number of white pixels for the detected blobs.

[jonas]

Please upload a sample image and show ud what you have tried do far

[swati mane]

hello sir i have uploaded an image

[swati mane]

I want to calculate the density of the vehicles on the road using blob analysis.Please help me for the same

[JAYANTH BHIMAVARAPU]

Have you followed this link: Blob analysis

Can you share the code you used for this?