segmentation in colorspace

This menu is for segmentation of color images by defining volumes in color-space. In this process, the system treats the red, green, and blue intensity values for each image pixel as if they were x, y, and z coordinates. In this scheme, every possible color corresponds to a particular location in a color cube that has a red axis, a green axis, and a blue axis. The system shows you a cloud diagram of this color cube, viewed from different angles, and you segment the image by defining polygons on the cloud diagrams; every pixel that maps to the interior of such a polygon is highlighted with the polygon's color. The procedure is as follows:

You click on DISPLAY IMAGE. This provides a reference image, that is never highlighted.
You click on one or more of DISPLAY RED vs GREEN, DISPLAY GREEN vs BLUE, DISPLAY RED vs BLUE, or DISPLAY ISOMETRIC. The system will display views of the color cube, with the density of image pixels indicated by a cloud-like image. You should be able to see clusters or groupings within the cloud diagrams.
You select a highlight color by clicking on the Highlight color menu field.
You click on ADD POLYGONS. The system prompts you to draw a polygon on one of the cloud diagrams. Use button 1 to draw successive vertices of the polygon, and finish it with button 2 or 3. The system will connect the last vertex back to the first vertex to close the loop.
You click on DISPLAY HIGHLIGHTS to see which image pixels have been selected.
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 cloud diagrams 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 dot on the cloud diagrams to indicate the position of that pixel. This is called backpicking.

You can remove unwanted polygons by clicking on REMOVE POLYGONS and indicating which polygons you want to remove. If you are working on very large images, you can speed up the generation of the cloud diagrams by entering a number greater than 1 in the Image sampling rate menu field. You can restrict the cloud diagram display to a slice of the entire cloud by setting the Enable slicing? toggle to Yes, and entering the center and thickness of the slice in the Slice center and Slice thickness menu fields. The center of the slice is expressed as an intensity value, with 0 farthest from you and 1 closest to you.

You can save a disk file that records your polygon definitions, 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.