Fujifilm S4500 has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor . On the other hand, Nikon P510 has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features Expeed C2 processor.
Below you can see the S4500 and P510 sensor size comparison.
Sensor Size and Resolution Comparison image of Fujifilm S4500 and Nikon P510 Cameras
Fujifilm S4500 and Nikon P510 have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture. On the other hand, since Fujifilm S4500 has 15% larger pixel area compared to Nikon P510, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.
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
Fujifilm S4500
or the
Nikon P510 ,
including hyperfocal distance.