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[USER=111323]Jamous[/USER] - It is indeed a halftone image, but not the ordinary kind where the dots are on a regular grid.  This approach is called "stochastic halftoning" (Google it - it is very important in the printing industry). 

In this approach, the probability of a dot at any position is controlled by the tonality at that position, and the positions are determined semi-randomly by an algorithm, eg, "place more random dots in areas with mid tones, ie transition areas between very light and very dark areas in the original".

Software to do the above can be pricy, but a very good approximation can be done by programs such as VanDerLee's Halftone .  Instead of doing the process described above, it first constructs a regular half-tone image, and then randomly moves each dot around within a prescribed radius.  If you have a high enough dot density, this approach can look almost identical to true stochastic halftoning.

HTH,

Tom M

PS - The big blocks of solid color are no big deal, you can set the adjustments in most of these programs so that at maximum density the dots completely overlap, and at minimum density, there are no dots.