Canon SX510 HS has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CMOS sensor and features Digic 4 processor. On the other hand, Samsung WB250F has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor .
Below you can see the SX510 HS and WB250F sensor size comparison.
Canon SX510 HS and Samsung WB250F 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 Samsung WB250F has 14% larger pixel area (2.01µm2 vs 1.76µm2) compared to Canon SX510 HS, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.