COLOUR MEASUREMENT DEVICE AND COLOUR MEASUREMENT METHOD

摘要

A color measurement device acquires an image of a relative position calibration chart. The relative position calibration chart includes a calibration figure having a given calibration feature that has a position that is detectable along at least one of a first and a second direction. A color measurement of the relative position calibration chart is performed. Relative position relationship-related information is derived based on the calibration feature in the image of the relative position calibration chart and the calibration feature in the color measurement of the relative position calibration chart. A color of each patch of a number of patches of a color chart is measured at a position corresponding to one of the patches while correcting the position of the patch based on the position relationship-related information.

主权项

1. A color measurement device comprising:
a color measuring sensor that:
performs color measurements; andmoves along a first direction; a conveyance roller that conveys a given sheet along a second direction that is orthogonal to the first direction; an imaging sensor that acquires images; a calibration amount processing circuit that:
causes the imaging sensor to acquire an image of a relative position calibration chart,
wherein the relative position calibration chart comprises a calibration figure having a given calibration feature, andwherein a position of the given calibration feature is detectable along at least one of the first and second directions;causes the color measuring sensor to perform a color measurement of the relative position calibration chart; andderives information about a relative position relationship between the color measuring sensor and the imaging sensor based on:
the given calibration feature in the image of the relative position calibration chart, andthe given calibration feature in a result of the color measurement of the relative position calibration chart; a position processing circuit that:
causes the imaging sensor to acquire an image of a color chart having a plurality of patches, wherein each of the plurality of patches comprises a region of a given color; andderives a position of each patch of the plurality of patches based on the image of the color chart; and a color measurement processing circuit that:
causes the color measuring sensor to measure the color of each of the plurality of patches, while correcting the position of each of the plurality of patches, based on the information about the relative position relationship.