Customize the HoughLineTransformation to use nonbinary image

[epsi1on]

Hi,
First thanks for the great library.
As far as I understand, the HoughLineTransformation takes a binary image as input. Binary means each pixel can have two value, 0 or 1. I have an anti-aliased line which i need to fed into the HoughLineTransformation. the edges are not 0 or 1, instead they have a value between 0 and 1. Can you please give me some guidance about how to customize the HoughLineTransformationin a way that it consider pixel value instead of 1 or 0. Or is it applicable and good idea at all? I need high precision specially for detecting anti-aliased lines.
Thanks