observed in figure 2, from shape of video signal on marked lines, as well as from representation of image in grey scale, as topological surface, where white regions correspond to high altitudes and dark regions correspond to low altitudes (figure 2 and figure 3), image is very noisily, with noises reaching to maximum grey level.
The direct thresholding of this image doesn’t offer any result, the obtaining image is strongly affected by noise, as can be seen in figure 3.