Regarding PDF path read

In order to obtain actual coordinates, we have used Mult() function of CTM to calculate a path of element type of PDF.

We have taken both path and CTM included in form, group, and marked content into account.
ex) Form.CTM.MULT ( PATH.CTM.MULT ( x, y ) )

However, in case of attached PDF file , we could have actual coordinates by taking off the CTM in marked content. If CTM was involved, we ended up with wrong coordinates.

We would like to know what’s wrong in this situation. And do you have any information we can refer to in terms of calculating actual coordinates?

incorrect_cooirdinates.pdf (501 KB)