A focus locking method and system for video shooting

Abstract

The invention discloses a focus locking method and system for video shooting, which focuses according to a preset focus mode in a preview mode of video shooting, performs focus lock after successful focusing, and maintains the focus locked state to the preset focus Lock the time range, after the focus lock time is over, check the angular velocity of the gyroscope and identify the information of the preview image, and judge whether to unlock according to the change degree of the gyroscope angular velocity or the change degree of the frame before and after the preview image, and judge the current state when starting video shooting According to the current focus lock state, notify the camera hardware motor to maintain the focus lock state or lock at the specified position to start shooting, and keep the camera hardware motor lock state during video shooting until the focus is re-triggered or Until the end of the shooting; thus effectively solving the problem of recording focus displacement caused by repeated focusing, and improving the effect of video capture.

Description

technical field [0001] The invention relates to the technical field of video shooting, in particular to a focus locking method for video shooting and a system for applying the method. Background technique [0002] The camera and video recording function has become the second largest functional module of smartphones. Apart from the phone function, smartphone manufacturers have made great efforts. Due to the convenience of mobile phones, the main direction of mobile phone shooting solutions is simple, fast and effective. To obtain a clear image, its lens cannot match professional and semi-professional cameras in all aspects, such as motor displacement, speed, and accuracy of focusing. During the video recording process, the brightness of the scene, content changes, mobile phone movement, etc. will trigger the generation of continuous auto focus, and this focus will also be recorded during the video shooting process. The slower the focusing speed, the more time it will be affec...

AI Technical Summary

Problems solved by technology

[0002] The camera and video recording function has become the second largest functional module of smartphones. Apart from the phone function, smartphone manufacturers have made great efforts. Due to the convenience of mobile phones, the main direction of mobile phone shooting solutions is simple, fast and effective. To obtain a clear image, its lens cannot match professional and semi-professional cameras in all aspects, such as motor displacement, speed, precision, etc.

During the video recording process, the brightness of the scene, content changes, mobile phone movement, etc. will trigger the generation of continuous auto focus, and this focus will also be recorded during the video shooting process. The slower the focusing speed, the more time it will be affected. The longer it is, it will also affect the final video shooting quality

[0003] At present, the most widely used focusing system on smartphones is contrast focusing. It uses the focus motor to move back and forth to form pictures of different resolutions. By comparing the clarity of each frame of the picture back and forth, it then moves the lens to the minimum focal length. On a clear focus surface, because of the back and forth comparison, there will be stretching of the picture, and this focusing process will be completely recorded in the video shooting. The slower the focus algorithm, the longer the impact time will be , At the same time, this focusing method will cause the focus to occur more frequently because it wants to ensure that the picture is always clear, and it also reduces the possibility of successful focusing. In fact, the focus will form the depth of field in optical imaging because of the focal length, and the Objects within the effective depth of field range are relatively clear, and the photographer generally shoots videos within a relatively certain range. If it is the spontaneous behavior of the machine, it will make the shooting experience very bad. Users can re-change the focus according to their own framing needs. Range, preventing excessive focus when shooting is conducive to improving the quality of the overall video picture

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