This invention concerns novel thiazole compounds. The eight spherical triangles St are composed of four first spherical triangles St1 and four second spherical triangles St2. When the image data stored in the detachable memory card are recorded, they are transferred from the memory card into the video tape recorder, via the camera apparatus. Similar processing is performed with respect to all the small areas, and at a peak where the maximum integral value of the similarity is obtained, its magnitude is compared with a threshold value to evaluate the similarity.