The first question that needs to be addressed is what do you mean by "recognize" people. A book could be written on this and many have. I'll just assume that we all have a general understanding of what it means to recognize another person based on appearence. Sound and odour are for another discussion..
There is no question that some stomatopods have the capacity to make the visual comparisons necessary to distinguish among humans. However, experiements proving that animals actually recognize individuals of another species are difficult. Spend a little time at an "octopus" site and you will see lots of claims by people that their pet octopus recognizes them, comes out to play when only they enter the room, jets water at strangers, etc. The problem with such accounts is that it is very difficult to control all the variables to "prove" recognition. Aside from facial differences, there are going to be differences in size, shape, dress, posture, time of day, direction and/or speed of approach, etc., etc. Whether the animal actually recognizes the individual based on specific spacial characteristics or gestalt, or is responding to general characteristics requires controlled experimentation where as many variables as possible are held constant and just one is systematically varied.
An easy way to do this is with photographs or video presentations where the image can be presented in the same way, but certain key variables altered. Unfortunately, stomatopod eyes are such that they do not respond as expected to video or color photos.
All that said, I'm convinced that some stomatopods such as O. scyllarus do recognize subtle differences in human form and may respond differently to them.
Roy
