Samsung HZ15W has a
12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor . On the other hand, Nikon S1100pj has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Expeed C2 processor.
Below you can see the HZ15W and S1100pj sensor size comparison.
Sensor Size and Resolution Comparison image of Samsung HZ15W and Nikon S1100pj Cameras
Samsung HZ15W and Nikon S1100pj have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Samsung HZ15W
or the
Nikon S1100pj ,
including hyperfocal distance.