Nikon A10 has a
16.0MP 1/2.3' (6.17 x 4.55 mm ) sized CCD sensor . On the other hand, Canon SX150 IS has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Digic 4 processor.
Below you can see the A10 and SX150 IS sensor size comparison.
Nikon A10 and Canon SX150 IS 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 Canon SX150 IS has 14% larger pixel area (2.01µm2 vs 1.76µm2) compared to Nikon A10, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.