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VLIB perimeter calculation

Daniel Garcia Llorente
Prodigy 100 points

Hi,

I am using the function VLIB_calcBlobPerimeter to calculate the perimeter of a circle, and the returned value doesn't match the calculated value from its radius (2*PI*r)

The documentation doesn't explain in detail how is it being calculated. Is it considering 8 bit neighbors or 4 bit neighbors? Is it rotation invariant? (e.g. the perimeter of a diagonal line is equal to the perimeters of the same vertical or horizontal line).

Regards,

Daniel

  • 0
    TI__Expert 5555 points
    Daniel,

    A pixel is considered to be on the border of the blob if at least one of its 4 closest neighbors (top, bottom, left, right) is not in the blob. In other words, if all 4 of these neighbors are in the blob, then it is NOT a border pixel. The perimeter is the sum of the border pixels.

    Regards,
    Jesse