Any Ideas? to find user's picture area of windows 10 logon screen.

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Hi there!~

I want to find user's picture area of windows 10 logon screen. (center position of circle)

I used way to find circle of image. but it's not enough accuracy. (HoughCircle)

always, the user's picture area of windows 10 logon screen is center of screen horizontally. but

it has various vertical position cause of some text message, or DPI, or something else.

Could you give me some helps or ideas to find exact vertical position of user's picture area by analysing image using openCV?

very thanks in advance.