| 摘要 |
A plurality of images photographed from the same object using a corresponding number of filters each having a light pass band different from one another are converted into television video signals of tri-color R, G and B having intensities or brightnesses corresponding to the densities of the images and subsequently these video signals are synthesized and displayed on a color monitor television. By eliminating selectively R, G and B level signals corresponding to the densities of the images from the synthesized color video signal, the density of the object in interest photographed in the images as well as the occupying area thereof can be determined merely by observing the change in color of the image displayed on the monitor device.
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