Sony W220 has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor . On the other hand, Olympus VH-410 has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features TruePic III+ processor.
Below you can see the W220 and VH-410 sensor size comparison.
Sony W220 and Olympus VH-410 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 Sony W220 has 32% larger pixel area compared to Olympus VH-410, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.