Olympus SZ-31MR iHS has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features Dual TruePic V processor. On the other hand, Olympus TG-5 has a
12.0MP (1/2. ) sized BSI-CMOS sensor and features TruePic VIII processor.
Below you can see the SZ-31MR iHS and TG-5 sensor size comparison.
As seen above, Olympus SZ-31MR iHS has a infx Larger sensor area than Olympus TG-5. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.