(a) (b)
Fig 1. Grab boom of crane and its three-dimensional gray distribution
Due to the blue and green colors on the two sides of the crane grabbing
boom, the R, G, and B channels of the original image are separated, and
the corresponding grayscale values are displayed in each channel. Using
the R and G channels to construct a grayscale image, as shown in Figure
2, the grayscale values of the two sides of the boom in Figure 2a in the
R channel are smaller than those in Figure 2b in the G channel. This is
because in RGB color models, the color components G that are usually
blue and green are greater than R. Therefore, it is reflected in the
grayscale images constructed by the R and G channels that the brightness
of the boom in the G channel is significantly higher than that of the
boom in the R channel. From this, a differential grayscale image 2c is
constructed. The three-dimensional gray distribution diagram is shown in
Figure 3.