How to get a perfect human silhouette

I am using vision.foregroundDetector and vision.blobAnalysis to extract blobs(Human) from an avi video. The extracted blobs are not very perfect. The legs dont have the separation between them and also the outline is not very clear. I am attaching an image. I would really appreciate if anyone can help or give some suggestions to improve the extracted blobs.

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[John D'Errico]

Surely you need to start with a perfect human. :)

As it is, I hardly think you will ever get a perfect silhouette from that image. You may need to reconcile yourself to slightly less than perfect.

[Walter Roberson]

It might help us to see the color frame.