Linear fit not working as expected?

[altenbach]

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@joptimus wrote:

How do I do that if I want both - horizontal and vertical fit lines in my blob image?

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As I said, transpose only for the vertical lines. 

You could even get fancy and fit the entire 2D grid of points to a warped surface, fitting for a few warping parameters and using the 2D distance between each real point and the corresponding fitted point as objective function to be all zero. You could use Levenberg Marquardt.

What is this all used for? What are you doing with the result of the fit?

[joptimus]

Transposing and fitting worked just fine, thank you!