1. A method for evaluating a possible pallet structure comprising: providing a gray scale image comprising one or more possible lines; providing respective pixel locations in the gray scale image for an estimated upper left corner of the possible pallet structure and an estimated upper right corner of the possible pallet structure; calculating, using a computer, a value h based on the estimated upper left corner location and the estimated upper right corner location; estimating, using the computer, a first hole with a first rectangle having a height h, the first hole corresponding to a left opening located to the left of a possible center stringer of the possible pallet structure; estimating, using the computer, a second hole with a second rectangle having the height h, the second hole corresponding to a right opening located to the right of the possible center stringer; and estimating, using the computer, the possible center stringer with a third rectangle having the height h.