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the original position the properties such as the xmin, ymin, width and height of
the rectangle are reset using the imtool function.
The cropped image is now the data where the level of water is determined
from. Since the image data is in gray scale each pixel intensity value varies from 0
to 255, these intensity values are used to plot an intensity profile along a specified
vector from the first pixel on the image to the last pixel on the image height wise.
The pixel intensity profile along a vector defined along the scale is as
observed in the image below.
Figure-24.
Pixel intensity profile of gray scale image.
As observed in the image the horizontal axis of the image represents the
water level in feet, the pixel intensity is plotted for data between 0 to 1 ft. on the
scale of the image for simplicity of the plot. The vertical axis represents the Pixel
intensity value which varies from 0 to 255. The plot reveals that the intensity of
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