| 摘要 |
A method includes obtaining (706) multiple images of a sheet (108) of material. The images contain a first line (204, 404, 504, 524a-524c, 544a-544c) projected onto a first side of the sheet and a second line (206, 406, 506a-506c, 526a-526c, 546a-546c) projected onto a second side of the sheet. The images include (i) at least one first image containing the first line reflected off the first side of the sheet and the second line transmitted through the sheet and (ii) at least one second image containing the second line reflected off the second side of the sheet and the first line transmitted through the sheet. The method also includes identifying (712) at least one point of intersection (410, 508, 528, 548) in the images where the lines intersect on the sheet. The method further includes identifying (718) a caliper of the sheet using the at least one point of intersection. |
