FIELD: image processing means.
SUBSTANCE: image processor that processes the captured images includes a means of controlling the image to control whether printing is performed correctly, by comparing with the reference image, using the image of the entire can, taken with the first camera, a density measurement means, for measuring densities at designated positions for respective colors, also by using an image of the entire can taken by the first camera, and a means of measuring the magnitude of the print misalignment, designed to measure the magnitude of the misalignment relative to the established positions of the print misalignment control marks printed on the end portion of the opening side of the can for the respective colors, using images of the end portion of the can opening side, taken with the second camera.
EFFECT: proposed are a device for printing on cans and the can control device.
9 cl, 15 dwg
