imaging/getting-started-with-image-streams.md

@@ -191,7 +191,17 @@ It would look as following (press ctrl-c, when you want to stop):
 Depending on your desired video quality, frame rate, compression, etc, you might need to change the command line parameters of **ffmpeg**. Sometimes it's not easy, but there is a lot of **ffmpeg** online documentation, Q&A, recipes, etc.
 
 # **cv-calc**: more image manipulations
-...
+**cv-cat** essentially deals with image filter pipelines, i.e. for each input image there is exactly one output image.
+
+**cv-calc** deals with the image manipulations that do not fit image-in-image-out pattern.
+
+**cv-calc** has operations for cropping, regions of interest, primitive drawing, equirectangular map generation, striding, thinning, etc.
+
+See **cv-calc --help --verbose** for details and meanwhile try **cv-calc life** which runs a generalised version of [game of life](https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life) on an arbitrary seed image.
+
+```
+> cv-cat --file cat.jpg | cv-calc life --procreation 3 --stability 5.255 --step 0.02 | cv-cat "count;view;null"
+```
 
 # converting images from/to csv
 ...