Removing unwanted points for tracking

[Prakash19921206]

i am new to this.
i think line 110 & 113 is used to remove the useless points for tracking ..
points[1][k++] = points[1][i];
can anyone explain how it works (above line of code) ? i'm unable to get it
why k++ why not just k
sorry to put it here.. i didn't find comment section