Sony Group Corporation
WATERMARK RECORDING DEVICE, WATERMARK DETECTION DEVICE, WATERMARK RECORDED PRINTED MATTER, AND METHOD AND PROGRAM

Abstract:

A device and a method that achieve a watermark that can be easily recorded and does not significantly impair the appearance of a printed matter are provided. A watermark recording unit (214) that records watermark dots having a color having a small difference from an area color of an area in which a watermark is recorded, and a watermark recording mode determination unit (213) that determines a color of the watermark dots are included. The watermark recording mode determination unit (213) determines a color of the watermark dots in such a way that a wavelength difference .DELTA..lamda., which is a difference between a color wavelength of the watermark dots and an area color wavelength of a recording area of the watermark dots, is less than a wavelength resolution of human eye. Moreover, the color of the watermark dots is determined in such a way that the wavelength difference .DELTA..lamda. is equal to or higher than a wavelength resolution of a spectroscopic camera (hyperspectral camera) (141) that captures an image for watermark analysis.