Swapped x and y values in world.cameraMatrix?

[MrMho]

Hi,

first off, thank you very much for writing this program and making it public.

Here is my issue:

The function cameraMatrix from the world module is called like this:

cameraMatrix = world.cameraMatrix(focalLength, (height / 2, width / 2))

That is, the second argument (center) is a tuple containing the center points in vertical or y-direction (height/2) and in horizontal or x-direction (width/2), in this particular order.

Now, please take a look inside the function. You can see that the center point for the y-direction (center[0]) is in the first row, whereas the center point for the x-direction (center[1]) appears in the second row of the matrix:

def cameraMatrix(fl, center):
    mat = [[fl, 1, center[0]],
                [0, fl, center[1]],
                [0, 0, 1]]

Compare this to the camera matrix defined in this Open CV tutorial:

with c_x and c_y being the respective center points.

It seems like the center points for the x and y directions are swapped. Or am I confusing something here?

[jim-meyer]

I noticed the same thing @MrMho . It sure looks like they need to be swapped. It's only noticeable in non-1:1 aspect ratio images though.