Olympus SH-3 has a
16.0MP 1/2.3' (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features TruePic VII processor. On the other hand, Canon SX610 HS has a
20.0MP 1/2.3' (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features DIGIC 4+ processor.
Below you can see the SH-3 and SX610 HS sensor size comparison.
Sensor Size and Resolution Comparison image of Olympus SH-3 and Canon SX610 HS Cameras
Olympus SH-3 and Canon SX610 HS 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.
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
Olympus SH-3
or the
Canon SX610 HS ,
including hyperfocal distance.