| 摘要 |
PURPOSE:To facilitate a measurement condition setting operation and to reasonably obtain the density discrimination reference of a background area even if the brightness of the background picture area of a gradation picture is not uniform. CONSTITUTION:A picture signal from a camera 2 is inputted to a picture processor 3 and a picture input part 5 A/D-converts the picture signal and stores it in a picture memory 6. CPU 12 segments the gradation picture inside the specified measurement area for obtaining characteristic quantity by a binarization threshold, calculates a density average and a dispersion value about the picture area corresponding to the background of the gradation picture and obtains the density discrimination reference of the background area. CPU 12 obtains the characteristic quantity of the gradation picture while it discriminates whether the respective constitution picture elements of the gradation picture inside the measurement area are the picture area of the background or the picture area of an object based on the density discrimination reference. |
