TONE CALIBRATION DEVICE, IMAGING DEVICE AND TONE INSPECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a tone calibration device that can easily acquire an accurate correction coefficient enabling a correct correction of image data for each imaging device.SOLUTION: A correction coefficient acquisition unit 151 is configured to cause mixed color light Pm to output from an integration sphere 111 of a homogenous light generation unit 110; measure the mixed color light by each pixel of a two-dimensional optical sensor of a camera 410; compare an amount of light reception in a prescribed pixel area around a center with an amount of light reception in other pixel area; and thereby calculate a shading correction coefficient for correcting lens distortion and the like for each pixel area. Then, A conversion matrix acquisition unit 152 is configured to cause single color homogenous light of a plurality of kinds different in a wavelength to be sequentially output from the integration sphere 111; acquire RGB values using the two-dimensional optical sensor of the camera 410, and acquire XYZ values by measuring amounts of light reception of these single color homogenous light with a spectroscopic device 130; and compare the RGB values with the XYZ values to thereby calculate an RGB-XYZ conversion matrix allowing for a correction of a spectrum sensitivity characteristic variation for each pixel area.