Ricoh WG-1000 has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor . On the other hand, Casio EX-H20G has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Exilim Engine HS processor.
Below you can see the WG-1000 and EX-H20G sensor size comparison.
Sensor Size and Resolution Comparison image of Ricoh WG-1000 and Casio EX-H20G Cameras
Ricoh WG-1000 and Casio EX-H20G 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 Casio EX-H20G has 14% larger pixel area (2.01µm 2 vs 1.76µm 2 ) compared to Ricoh WG-1000, it has larger pixel area to collect light hence potential to 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
Ricoh WG-1000
or the
Casio EX-H20G ,
including hyperfocal distance.