Both Canon SX130 IS and Samsung SL820 have 1/2.3-inch sized 12.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the SX130 IS and SL820 sensor size comparison.
Sensor Size and Resolution Comparison image of Canon SX130 IS and Samsung SL820 Cameras
Canon SX130 IS and Samsung SL820 have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Canon SX130 IS
or the
Samsung SL820 ,
including hyperfocal distance.
