Figure 4. Absolute Value Difference Grayscale Map and Difference
Grayscale
Map
(a) (b)
Figure 5. Three dimensional gray distribution of absolute value
difference gray map, and three dimensional gray distribution of
difference gray map
It is obvious that there is more image information in 4a, but most of
them are interference pixels. Its two-dimensional gray-scale histogram
shows multi peak characteristics, and its three-dimensional gray-scale
distribution diagram 5a shows highly consistent with the information in
Figure 4a. The method proposed in this article is used to construct a
differential grayscale image. Figure 4b shows that the grayscale values
in the area where the crane grasps the boom are brighter than the
surrounding environment, and are highlighted to achieve the purpose of
constructing differences. Figure 6b 2D gray histogram shows that the
gray value of more than 90% of the pixels in the whole image is 0, with
obvious peaks and troughs, showing a bimodal distribution.