The measuring error in the measurement of the glossiness of curved surfaces was significantly reduced by two techniques; change of the setting of the CCD line sensor and scanning of specimens.

Brightness pattern golssiness GBP of pearls was measured by the system, which consists of a CCD-TV camera, an image processor, etc. The GBP was considered to be roughly suitable for the physical glossiness of pearls.

A new method for detecting the projections on the spherical pearls was proposed using an optical system, a CCD-TV camera with an image processor.

The human judges generally the gloss by the distinctness degree of the image projected on the specimen surface. If the CCD camera is used instead of the human eyes, the distinctness degree of the image will relate deeply to the brightness pattern formed on the CCD camera. Therefore, first, the brightness pattern on the CCD camera was obtained theoretically. Utilizing the calculated brightness pattern, we defined newly the brightness pattern glossiness GBP which was applicable to the spherical specimens. Next, the validity of the GBP was confirmed by the experiments which used the enamel painted balls and the spherical pearls.