Olympus TG-3 has a
16.0MP (1/2. ) sized BSI-CMOS sensor and features TruePic VII processor. On the other hand, Canon SD970 IS has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Below you can see the TG-3 and SD970 IS sensor size comparison.
As seen above, Canon SD970 IS has a infx Larger sensor area than Olympus TG-3. 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.