How to find intersection point x and y using extrapolation or polyfit

I have two points A and B.point A(x,y) and point B(x,y) in 192 frames. I want to make extrapolation or ployfit and polyval. to get the intersection point (x,y) with the lower and upper horizontal lines without back to the video and expecting that point coordinates. the lower horizontal line has two points E and F, and (x,y)and the upper horizontal line has two points C and D (x,y). But the problem is the y-axis is different for each frame because it goes up and down and backward and x-axis goes forward and backward. I need to find this point automatically acoodring this point's coordinates.

please look at the picture

Thanks in advance

the y-axis is not stable in all frames.

[Walter Roberson]

Does this involve image processing to detect the points, or did you already detect the points?

Having a couple of image frames to work with would help our understanding.

[Mansour Attaallah]

Thank you for the reply, No this is one image for one frame. I just used windows painter to explain what I want. i did not detect the intersection points yet. I will send you the six points coordinates thanks again I will be so glad if you find a way to do that