Canon SX20 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, Samsung TL500 has a 10.0MP 1/1.7-inch (7.44 x 5.58 mm ) sized CCD sensor .
Below you can see the SX20 IS and TL500 sensor size comparison.
As seen above, Samsung TL500 has a 1.5x Larger sensor area than Canon SX20 IS. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.