Experimenting With Background Subtraction

When testing the brightness thresholding example, I found that in order for it to work as required for my piece, then the background behind the person needed to be clear. This is a problem in the public space, due to the walls being covered in pictures and posters, as well as Costa in the background. Therefore, I decided to briefly experiment with background subtraction in order to see if it would benefit my piece.Screen Shot 2015-01-13 at 15.11.36

Here are the before and after screen shots:
Screen Shot 2015-01-13 at 14.51.16

Screen Shot 2015-01-13 at 14.51.30As you can see the background subtraction takes away the green wall and produces an outline around the objects. I experimented with altering the threshold levels and altered various bit of code. However, I felt that the effect looks quite grainy and I was unable to create a silhouette like figure. Also, each time I want to subtract the background, currently I have to hold down the mouse. This may become quite hard in the public space, as there will be lots of people walking around in both the background and foreground and therefore I feel that this effect won’t work as required. Therefore, from this I have decided when displaying my piece in the Weymouth House, I plan to put up a white screen for users to stand in front of. Next, I will usability test my interactive piece, ensuring there is a plain background behind the user.

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