segmentation from histogram

1. You click on the DISPLAY IMAGE menu field. The system will display your image.
2. You set the number of histogram divisions you want, and click on DISPLAY HISTOGRAM. The system will display an intensity histogram of the image. Initially, all of the histogram bars are white, that is, unhighlighted.
3. You select a highlight color by clicking on the Highlight color menu field.
4. You select bars on the histogram that you want to highlight. You can highlight one bar by clicking on it twice with button 1. You can select a set of bars by clicking on the first and last of the set with button 1. The bar or bars will change to the current highlight color. You can set the highlight color to white to unhighlight bars. The system displays highlighted pixels in real time while you modify the histogram.
5. When you are satisfied with the segmentation, enter the name you want the bitmap file to have in the Bitmap file menu field. If you want to increase the resolution of the bitmap beyond that of the original image, enter the factor in the Magnification factor menu field. Set the Run-length encode? toggle according to whether you want the bitmap to be run-length encoded. Run-length encoded bitmaps usually take up less disk space. Finally, click on the CREATE BITMAP menu field to create the bitmap.

You can see where particular image pixels fall in the histogram by moving the mouse to the portion of the image you are interested in, and clicking on button 2. The system will put a small arrow on the histogram to indicate the intensity of that pixel. This is called backpicking.

You can save a disk file that records your histogram selections, and recall it for use on other images. To do so, enter the name you want for the disk file in the Pick file menu field, and click on SAVE PICK FILE. To recall such a file, enter its name in the Pick file menu field, and click on RECALL PICK FILE.

You can clear all the currently picked bars by clicking on CLEAR ALL PICKS.