CN-122018224-A - Stereo camera and control method thereof

CN122018224ACN 122018224 ACN122018224 ACN 122018224ACN-122018224-A

Abstract

The invention discloses a stereoscopic camera and a control method thereof, and relates to the technical field of stereoscopic video shooting, wherein the stereoscopic camera comprises two zoom lenses, a driving mechanism and a control module, the driving mechanism is respectively in transmission connection with the two zoom lenses, and is used for driving the two zoom lenses to relatively move along a base line direction and keeping the midpoint position of the base line between the two zoom lenses fixed in the moving process; the control module is electrically connected with the driving mechanism and the two zoom lenses respectively, is used for adjusting the focal length of the zoom lenses based on the zoom instruction, is also used for calculating the designated interval based on the zoom instruction, and controls the driving mechanism to drive the two zoom lenses to move relatively so as to enable the baseline interval between the two zoom lenses to be changed into the designated interval. According to the invention, through the cooperative coordination of the driving mechanism and the control module, the synchronous adjustment of the base line spacing is automatically completed while the focal length is changed, so that the consistency of stereoscopic impression is ensured, and the occurrence of stereoscopic parallax offset is avoided.

Inventors

LIN SHUSEN
TONG JIAYI
MA BAIWEI

Assignees

深圳实域科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260202

Claims (10)

1. A stereoscopic camera, comprising: Two zoom lenses; The driving mechanism is respectively in transmission connection with the two zoom lenses, and is used for driving the two zoom lenses to move relatively to each other along the base line direction and keeping the midpoint position of the base line between the two zoom lenses fixed in the moving process; The control module is used for calculating a specified interval based on the zoom command and controlling the driving mechanism to drive the two zoom lenses to move relatively so as to change a baseline interval between the two zoom lenses into the specified interval.
2. The stereoscopic camera of claim 1, further comprising a camera housing and a slide rail, wherein the drive mechanism, the zoom lens, the control module, and the slide rail are disposed within the camera housing; The two zoom lenses are slidably mounted on the sliding rail, and the extending direction of the sliding rail is parallel to the base line direction.
3. The stereoscopic camera of claim 1, wherein the control module is further configured to obtain a specified focal length based on the zoom command, determine whether the specified focal length is greater than an optical maximum focal length of the zoom lens, adjust the focal length of the zoom lens to the specified focal length if the specified focal length is less than or equal to the optical maximum focal length, adjust the focal length of the zoom lens to the optical maximum focal length if the specified focal length is greater than the optical maximum focal length, and digitally zoom an image acquired by an image sensor of the zoom lens until a product of a digital magnification of the digital zoom and the optical maximum focal length is equal to the specified focal length.
4. The stereoscopic camera of claim 3, wherein the control module is further configured to determine whether the specified distance is smaller than a minimum physical distance between the two zoom lenses, control the driving mechanism to synchronously drive the two zoom lenses to move relatively if the specified distance is greater than or equal to the minimum physical distance so that a baseline distance between the two zoom lenses becomes the specified distance, control the driving mechanism to synchronously drive the two zoom lenses to move relatively if the specified distance is smaller than the minimum physical distance so that the baseline distance between the two zoom lenses becomes the minimum physical distance, and perform center displacement cropping on two image frames acquired by the image sensors of the two zoom lenses until a difference between the minimum physical distance and an equivalent baseline displacement amount of the center displacement is equal to the specified distance.
5. A stereoscopic camera according to claim 3, wherein the control module is further configured to dynamically match a zoom rate of the zoom lens with a drive rate of the drive mechanism such that a product of a real-time focal length of the zoom lens and a real-time baseline spacing remains constant.
6. A stereoscopic camera control method, comprising the steps of: obtaining a zooming instruction; calculating to obtain a specified focal length and a specified distance based on the zooming instruction; And adjusting the focal length of the zoom lenses to the designated focal length, and driving the two zoom lenses to move relatively so as to adjust the baseline interval between the two zoom lenses to the designated interval, wherein the midpoint position of the baseline between the two zoom lenses is kept fixed in the moving process of the two zoom lenses.
7. The stereoscopic camera control method according to claim 6, wherein the step of calculating a specified focal length and a specified pitch based on the zoom instruction comprises: obtaining the designated focal length based on the zooming instruction; Acquiring the current focal lengths and the current baseline spacing of the two zoom lenses; And calculating the specified distance based on the current focal length, the current baseline distance and the specified focal length, wherein the product of the current focal length and the current baseline distance is equal to the product of the specified focal length and the specified distance.
8. The stereoscopic camera control method according to claim 6, wherein the step of adjusting the focal length of the zoom lens to the specified focal length includes: Judging whether the appointed focal length is larger than the optical maximum focal length of the zoom lens; If the appointed focal length is smaller than or equal to the optical maximum focal length, adjusting the focal length of the zoom lens to the appointed focal length; and if the specified focal length is larger than the optical maximum focal length, adjusting the focal length of the zoom lens to the optical maximum focal length, and carrying out digital zooming on an image picture acquired by an image sensor of the zoom lens until the product of the digital magnification of the digital zooming and the optical maximum focal length is equal to the specified focal length.
9. The stereoscopic camera control method according to claim 6, wherein the step of driving the two zoom lenses to relatively move so that a baseline interval between the two zoom lenses is adjusted to the specified interval comprises: Judging whether the designated distance is smaller than the minimum physical distance between the two zoom lenses; If the specified interval is greater than or equal to the minimum physical interval, driving the two zoom lenses to move relatively so as to adjust the baseline interval between the two zoom lenses to be the specified interval; And if the specified distance is smaller than the minimum physical distance, driving the two zoom lenses to move relatively, adjusting the baseline distance between the two zoom lenses to the minimum physical distance, and performing center displacement cutting on two image frames acquired by the image sensors of the two zoom lenses until the difference between the minimum physical distance and the equivalent baseline displacement amount of the center displacement cutting is equal to the specified distance.
10. The stereoscopic camera control method according to any one of claims 6 to 9, wherein a product of a real-time focal length of the zoom lens and a real-time baseline spacing is kept constant during zoom adjustment and baseline spacing adjustment of the zoom lens.

Description

Stereo camera and control method thereof Technical Field The invention relates to the technical field of stereoscopic video shooting, in particular to a stereoscopic camera and a control method thereof. Background The stereoscopic video shooting technology realizes three-dimensional perception by simulating human eye parallax based on a binocular vision principle. Early stereoscopic shooting relies on double-camera fixed-interval combination, and then an integrated binocular camera is developed and gradually applied to the fields of consumer electronics, video production, virtual reality and the like. The stereoscopic camera realizes stereoscopic video shooting by adopting binocular heads to synchronously shoot. Most of binocular stereoscopic cameras on the current market have no zoom function, so that objects at clear distances cannot be watched. A few stereoscopic cameras introduce an optical zoom function to capture a long shot, but still keep the binocular distance constant, i.e. the baseline fixed. However, even in a small number of stereoscopic camera products having a zoom function, there is a problem that the angle of view after zooming does not match the base line length, which results in a stereoscopic parallax disorder, and visual confusion and a dizziness feeling are likely to occur when viewing. Therefore, the problem of stereo parallax offset existing after the stereo camera is zoomed is needed to be solved. Disclosure of Invention The invention mainly aims to provide a stereoscopic camera and a control method thereof, and aims to solve the problem of stereoscopic parallax offset existing after zooming of the stereoscopic camera. The stereoscopic camera comprises a driving mechanism, a control module and two zoom lenses, wherein the driving mechanism is respectively in transmission connection with the two zoom lenses, the driving mechanism is used for driving the two zoom lenses to move relatively along a base line direction and keeping the position of a base line midpoint between the two zoom lenses fixed in the moving process, the control module is respectively and electrically connected with the driving mechanism and the two zoom lenses, the control module is used for adjusting the focal length of the zoom lenses based on zoom instructions, and the control module is also used for calculating a designated interval based on the zoom instructions and controlling the driving mechanism to drive the two zoom lenses to move relatively so as to enable the base line interval between the two zoom lenses to be changed into the designated interval. In an embodiment, the stereo camera further comprises a camera shell and a sliding rail, wherein the driving mechanism, the zoom lenses, the control module and the sliding rail are all arranged in the camera shell, the two zoom lenses are slidably arranged on the sliding rail, and the extending direction of the sliding rail is parallel to the base line direction. In one embodiment, the driving mechanism comprises a motor, and the motor is respectively connected with the two zoom lenses in a transmission way. In an embodiment, the driving mechanism further comprises a driving gear and two racks, the rotating part of the motor is connected with the driving gear, the driving gear is meshed with the two racks respectively, the two racks are symmetrically arranged about the rotation center of the driving gear, and the two racks are connected with the two zoom lenses in a one-to-one correspondence mode. In an embodiment, the driving mechanism further comprises two sets of link mechanisms, the rotating part of the motor is respectively connected with one end link of the two sets of link mechanisms, and the two zoom lenses are respectively correspondingly and rotatably connected with the other end link of the two sets of link mechanisms. In an embodiment, the control module is further configured to obtain a specified focal length based on the zoom instruction, determine whether the specified focal length is greater than an optical maximum focal length of the zoom lens, adjust the focal length of the zoom lens to the specified focal length if the specified focal length is less than or equal to the optical maximum focal length, adjust the focal length of the zoom lens to the optical maximum focal length if the specified focal length is greater than the optical maximum focal length, and digitally zoom an image acquired by an image sensor of the zoom lens until a product of a digital magnification of the digital zoom and the optical maximum focal length is equal to the specified focal length. In an embodiment, the control module is further configured to determine whether the specified distance is smaller than a minimum physical distance between the two zoom lenses, if the specified distance is greater than or equal to the minimum physical distance, control the driving mechanism to synchronously drive the two zoom lenses to move relatively so that a baseline distance bet