Canon SX130 IS has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Digic 4 processor. On the other hand, Nikon A1000 has a
16.0MP 1/2.3 (6.17 x 4.55 mm ) sized BSI-CMOS sensor .
Below you can see the SX130 IS and A1000 sensor size comparison.
Canon SX130 IS and Nikon A1000 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 SX130 IS has 32% larger pixel area compared to Nikon A1000, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.