Patent ID: 8311385
Filing Date: 2012-11-13
Classification: G06T,H04N

Abstract:
1. A device for controlling a video recording attribute of a camera module, comprising: a video input unit that receives video data corresponding to frames from the camera module; a motion information acquiring unit that acquires motion information between two successive frames; a video recording attribute determining unit that determines the video recording attribute of the camera module on the basis of the motion information; and a camera module controller that generates a camera module control signal for causing the camera module to perform a video recording operation on the basis of the determined video recording attribute and outputs the camera module control signal to the camera module, wherein the motion information acquiring unit includes: a block selecting section that selects one of a plurality of candidate blocks, into which the later frame of the two successive frames is divided so as not to overlap with each other, as a reference block; a search range setting section that sets a search range on the basis of the position of the reference block in the previous frame; a block comparison value calculating section that calculates a block comparison value between pixel values in a comparison block moving by pixels in the search range and pixel values in the reference block; a motion vector acquiring section that acquires a block motion vector from the position of the comparison position and the position of the reference block, which make the block comparison value the minimum; and a motion ratio calculating section that calculates a motion ratio by normalizing the magnitude of the block motion vector with predetermined maximum value and minimum value, wherein the video recording attribute includes at least one of a frame rate of the camera module and an exposure value of the camera module, wherein when the video recording attribute includes the frame rate of the camera module, the video recording attribute determining unit determines as the frame rate a value obtained by multiplying a predetermined maximum value of the frame rate by the motion ratio, wherein when the video recording attribute includes the exposure value of the camera module, the video recording attribute determining unit determines as the exposure value EXPprop obtained by Expression, EXPprop=(1−Vnor)×(EXPmax−EXPmin)+EXPmin, where Vnor represents the motion ratio, EXPmax represents the predetermined maximum value of the exposure value, and EXPmin represents the predetermined minimum value of the exposure value, and wherein when the video recording attribute includes the frame rate and the exposure value of the camera module, the video recording attribute determining unit determines as the frame rate a value obtained by multiplying a predetermined maximum value of the frame rate by the motion ratio and determines as the exposure value EXPprop obtained by Expression, EXPprop=(1−Vnor)×(EXPmax−EXPmin)+EXPmin, where Vnor represents the motion ratio, EXPmax represents the predetermined maximum value of the exposure value, and EXPmin represents the predetermined minimum value of the exposure value.