| 摘要 |
PURPOSE:To precisely inspect the quality state of a colorchanging surface by quantizing a video signal to conduct differential processing in the color changing direction, and then integrating the result vertically to the color changing direction to calculate a standard deviation. CONSTITUTION:A film 10 is exposed to an illumination 11, and the transmitted light is picked up by a television camera 12 and quantized by an A/D converter 21 to form a digital image, which is then inputted to an image memory 22. On the basis of this image, the quality of a color transitional part on the surface is judged by a CPU 23, and transmitted from an output part to the outside. To the image data, a spatial differential value in Ndirection (color transitional direction) is determined. Each signal in N-direction is integrated in M-direction, and the average density in M-direction is determined with a specific expression to form an one-dimensional signal. This signal is divided into small areas as mutually superposing with an optional size, a standard deviation of density within each area is calculated to determine the difference in standard deviation between adjacent areas, the maximum value, minimum value, difference between the maximum and minimum values, and width are extracted as parameters, and these are inputted to a neural network to judge its rank. |
