A system comprising: a predefined reference pattern comprising a plurality of optically perceptible elements , the optically perceptible elements comprising at least a first optically perceptible element and a second optically perceptible element , wherein the first optically perceptible element has a first predefined dimension (a), wherein the second optically perceptible element has a second predefined dimension (c), wherein the first optically perceptible element and the second optically perceptible element are separated from each other by a first predefined distance; and a dimensioner configured to: determine at least one dimension of an object ; measure the first predefined dimension (a) from one or more images of the predefined reference pattern captured by the dimensioner ; measure the first predefined distance between the first optically perceptible element and the second optically perceptible element ; calculate a first ratio of the measured first predefined dimension (a) of the first optically perceptible element and the measured first predefined distance; measure the second predefined dimension (c) from one or more images of the predefined reference pattern captured by the dimensioner ; calculate a second ratio of the measured second predefined dimension (c) of the second optically perceptible element and the measured first predefined distance; wherein the dimensioner is further configured to be calibrated based on the calculated first ratio and the calculated second ratio. a predefined reference pattern comprising a plurality of optically perceptible elements , the optically perceptible elements comprising at least a first optically perceptible element and a second optically perceptible element , wherein the first optically perceptible element has a first predefined dimension (a), wherein the second optically perceptible element has a second predefined dimension (c), wherein the first optically perceptible element and the second optically perceptible element are separated from each other by a first predefined distance; and a dimensioner configured to: determine at least one dimension of an object ; wherein the first optically perceptible element has a first predefined dimension (a), wherein the second optically perceptible element has a second predefined dimension (c), wherein the first optically perceptible element and the second optically perceptible element are separated from each other by a first predefined distance; and a dimensioner configured to: determine at least one dimension of an object ; measure the first predefined dimension (a) from one or more images of the predefined reference pattern captured by the dimensioner ; measure the first predefined distance between the first optically perceptible element and the second optically perceptible element ; calculate a first ratio of the measured first predefined dimension (a) of the first optically perceptible element and the measured first predefined distance; measure the second predefined dimension (c) from one or more images of the predefined reference pattern captured by the dimensioner ; calculate a second ratio of the measured second predefined dimension (c) of the second optically perceptible element and the measured first predefined distance; wherein the dimensioner is further configured to be calibrated based on the calculated first ratio and the calculated second ratio. <EOS>