JHV User's Guide

Image Analysis

JHV displays pixel values or digital values by setting the View Menu option in the image window to pixel value or digital value respectively. JHV also generate radial xy-plots or histograms from images.


1. Image Value

Setting the view option in the image window and moving the mouse on the image, the JHV will popup a dialog window containing the coordinates and the image value of the point which the mouse is pointing at. The following figure is an example of such image value display. The left is the digital value display and the right is the pixel value display.

2. Radial Plot

A radial plot is an xy-plot in which image values are displayed line by line. To make such an xy-plot, first make sure that the view option is set at "Pixel Value" or Digital Value", then set the plot option to "Radial Plots". When you press down and move the mouse on the image, an radial plot will pop up. The following chart is an example of radial xy-plot.

3. Histogram

A histogram is an xy-plot of the distribution of image values of the selected image area. To make such an xy-plot, first make sure that the view option is set at "Pixel Value" or Digital Value", then set the plot option to "Histogram Plots". When you press down and move the mouse on the image, an histogram plot will pop up. The following chart is an example of histogram xy-plot.


NCSA
The National Center for Supercomputing Applications

University of Illinois at Urbana-Champaign

hdfhelp@ncsa.uiuc.edu