The PowerShot ELPH 510 HS supports a maximum video resolution of 1920 x 1080 pixels. That's over six times the video resolution of the most common video resolution of 640 x 480 pixels (which is also supported by this camera). This Canon camera also support a video resolution of 320 x 240 pixels and 1280 x 720 pixels. A video resolution of 1920 x 1080 pixels is equivalent to Full HD video. You will require a Full HD TV or better to appreciate this level of detail.
A 1920 x 1080 pixels video resolution is actually the best supported video resolution amongst all compact camera digital cameras that came out around the same time as the PowerShot ELPH 510 HS.
A 320 x 240 pixels video resolution is the worst supported video resolution across comparable types of camera.