Olympus TG-4 has a 16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features TruePic VII processor. On the other hand, Canon A3200 IS has a 14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features DIGIC 4 with iSAPS technology processor.
Below you can see the TG-4 and A3200 IS sensor size comparison.
Olympus TG-4 and Canon A3200 IS have 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 Canon A3200 IS has 14% larger pixel area (2.01µm2 vs 1.76µm2) compared to Olympus TG-4, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.