Sony W510 has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features BIONZ processor. On the other hand, Sony H50 has a
9.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Below you can see the W510 and H50 sensor size comparison.
Sony W510 and Sony H50 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 H50 has 33% larger pixel area (3.13µm2 vs 2.34µm2) compared to Sony W510, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.