Patent ID: 9451157
Filing Date: 2016-09-20
CPC Classification: H04N

Claim Text:
1. A video recording device, comprising: a main capturing module, for capturing an imaged target according to a main focus parameter, wherein the main capturing module adopts a first main recording focal length as the main focus parameter; a supplementary capturing module, for capturing the imaged target and generating a plurality of supplementary capturing pictures; and a controller, electrically connected to the main capturing module and the supplementary capturing module, for selectively updating the main focus parameter according to a supplementary focus parameter, wherein the supplementary focus parameter is obtained according to the plurality of supplementary capturing pictures, and the controller obtains a second main recording focal length according to the supplementary focus parameter and selectively updates the main focus parameter according to the second main recording focal length; wherein the main capturing module captures a plurality of main capturing pictures before recording, and records the imaged target according to the main focus parameter obtained from the plurality of main capturing pictures; wherein when an update condition is satisfied, the controller selects the second main recording focal length as the main focus parameter; and when the update condition is not satisfied, the controller keeps the first main recording focal length as the main focus parameter, wherein the update condition represents that a difference between the second main recording focal length and the first main recording focal length is greater than a predetermined threshold.