| 摘要 |
PURPOSE:To evaluate the glossiness of a coated surface over a wide range automatically and quantitatively with high accuracy by mapping a parallel stripe grating arranged on the front of the coated surface on the coating surface, and bringing a two-dimensional image sensor into focus on the coated surface and picking up an image. CONSTITUTION:The focal length of a TV camera 3 at a specific distance is set to the coated surface 1 and the camera is put in an open aperture state. In this state, an image incident on the camera 3 varies in luminosity corresponding to the grating of a longitudinal stripe grating panel 2, the camera 3 outputs an image signal, and a RAM 12 is supplied with a quantized image signal through an A/D converter 11. Further, a computer 13 for analysis processes image data on one image inputted to the RAM 12 to calculate the frequency distribution of the image signal level and find the standard deviation, and quantizes and judges the glossiness, which is indicated to an output device. Further, detected crossing curve points are counted to judge smoothness, which is indicated to the output device similarly. Thus, the coated surface 1 is evaluated over a wide range automatically and quantitatively with high accuracy.
|
