IMAGE PROCESSOR OF RESIN SHEET, SURFACE CONCAVITY AND CONVEXITY DETECTION METHOD OF RESIN SHEET, AND MANUFACTURING METHOD OF RESIN SHEET HAVING CONCAVITIES AND CONVEXITIES ON THE SURFACE

摘要

PROBLEM TO BE SOLVED: To provide an image processor of a resin sheet capable of detecting an area of the surface not being transferred with concavities and convexities under a state that diffuse light penetrates the resin sheet having concavities and convexities on the surface, and a surface concavity and convexity detection method of resin sheet and a manufacturing method of a resin sheet having concavities and convexities on the surface.;SOLUTION: The image processor of resin sheet calculates brightness values in plural areas in divided images of a pick-up area. Based on the brightness value in each area, a threshold level (valley gradation value V) for binarization in a discriminant analysis method is calculated. When the threshold level (valley gradation value V) is within a range of a preset tone from a lower limit tone THUD to an upper limit tone THUD, the image processor determines that the resin sheet has a defect in the concavities and convexities.;SELECTED DRAWING: Figure 8;COPYRIGHT: (C)2018,JPO&INPIT