WO2019096016A1 - 一种实现子弹时间拍摄效果的方法及全景相机 - Google Patents

一种实现子弹时间拍摄效果的方法及全景相机 Download PDF

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WO2019096016A1
WO2019096016A1 PCT/CN2018/113720 CN2018113720W WO2019096016A1 WO 2019096016 A1 WO2019096016 A1 WO 2019096016A1 CN 2018113720 W CN2018113720 W CN 2018113720W WO 2019096016 A1 WO2019096016 A1 WO 2019096016A1
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image
bullet time
panoramic camera
shooting
panoramic
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PCT/CN2018/113720
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English (en)
French (fr)
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陈聪
姜文杰
刘靖康
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深圳岚锋创视网络科技有限公司
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Priority to EP18877801.3A priority Critical patent/EP3713228A4/en
Priority to US16/764,366 priority patent/US11233944B2/en
Priority to JP2020526319A priority patent/JP7319974B2/ja
Publication of WO2019096016A1 publication Critical patent/WO2019096016A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T3/00—Geometric image transformations in the plane of the image
    • G06T3/06—Topological mapping of higher dimensional structures onto lower dimensional surfaces
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T3/00—Geometric image transformations in the plane of the image
    • G06T3/40—Scaling of whole images or parts thereof, e.g. expanding or contracting
    • G06T3/4038—Image mosaicing, e.g. composing plane images from plane sub-images
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/682—Vibration or motion blur correction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/682—Vibration or motion blur correction
    • H04N23/684—Vibration or motion blur correction performed by controlling the image sensor readout, e.g. by controlling the integration time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/682—Vibration or motion blur correction
    • H04N23/684—Vibration or motion blur correction performed by controlling the image sensor readout, e.g. by controlling the integration time
    • H04N23/6842—Vibration or motion blur correction performed by controlling the image sensor readout, e.g. by controlling the integration time by controlling the scanning position, e.g. windowing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/682—Vibration or motion blur correction
    • H04N23/684—Vibration or motion blur correction performed by controlling the image sensor readout, e.g. by controlling the integration time
    • H04N23/6845—Vibration or motion blur correction performed by controlling the image sensor readout, e.g. by controlling the integration time by combination of a plurality of images sequentially taken
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/698—Control of cameras or camera modules for achieving an enlarged field of view, e.g. panoramic image capture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
    • H04N5/2625—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects for obtaining an image which is composed of images from a temporal image sequence, e.g. for a stroboscopic effect
    • H04N5/2627—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects for obtaining an image which is composed of images from a temporal image sequence, e.g. for a stroboscopic effect for providing spin image effect, 3D stop motion effect or temporal freeze effect
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/682—Vibration or motion blur correction
    • H04N23/683—Vibration or motion blur correction performed by a processor, e.g. controlling the readout of an image memory

Definitions

  • the invention belongs to the field of image processing, and in particular relates to a method for realizing a bullet time shooting effect and a panoramic camera.
  • Bullet time is a computer-aided photographic technique used to simulate shifting effects in movies, TV commercials, or computer games, such as enhanced slow motion and time stillness.
  • Bullet time shooting was originally achieved with a series of still cameras (not cameras) around the object. These camera arrays typically trigger the shutter simultaneously or sequentially. Combining each frame of photographs taken by each camera can constitute a viewing angle rotation effect on a stationary object, or a super slow motion effect. In theory, virtual cameras can achieve unlimited viewing angles and frame refresh rates, but implementations with still cameras are often limited by the shooting path.
  • the bullet time is characterized by extreme changes in time and extreme changes in space: the angle of the shot (viewer's perspective) is also rotated around the scene while the slow motion is being shot.
  • Bullet time is widely used in film, advertising, MV, creative activities and other fields.
  • the visual effect of bullet time seems gorgeous, but it is more complicated to make.
  • Conventional cameras cannot maintain the shooting angle to capture the target object at the same time as the high-speed motion. Therefore, to achieve the bullet time shooting effect, it is necessary to pre-position multiple cameras in the shooting path, by controlling the exposure order of the camera, shooting the frame sequence, and after the post-synthesis, The shooting effect of bullet time.
  • the existing system for realizing the time shooting effect of the bullet due to the large number of cameras, the inaccurate control, the shooting progress is slow, unable to meet the shooting needs, and the price is high, and the shooting cost is high.
  • An object of the present invention is to provide a method for realizing a bullet time shooting effect, a computer readable storage medium, and a panoramic camera, which aim to solve the problem that the prior art has a slow shooting process due to a large number of cameras and inaccurate control, and cannot meet the shooting needs. And the price is expensive, and the cost of shooting is high.
  • the present invention provides a method for implementing a bullet time shooting effect, the method comprising:
  • the present invention provides a computer readable storage medium storing a computer program, the computer program being executed by a processor to implement the steps of the method for implementing a bullet time shooting effect as described above .
  • the present invention provides a panoramic camera comprising one or more processors, a memory coupled to the processor, and one or more computer programs, wherein the one or more computer programs are stored in the memory And configured to be executed by the one or more processors, the processor performing the steps of the method of implementing a bullet time capture effect as described above when executing the computer program.
  • a panoramic video is captured when the panoramic camera rotates around the shooting target; a hemispherical image near the shooting target side is acquired from the panoramic video; the hemispherical image is stitched to generate a stitched image; and then the viewpoint of the stitched image is fixed, thereby realizing the bullet Time shooting effect. That is, only one panoramic camera is required to shoot the bullet time shooting effect, so the shooting time of the bullet time shooting effect of the invention is low, and since the bullet time shooting effect is to shoot the panoramic video when the panoramic camera rotates around the shooting target, the The panoramic video is processed, so the precision is high.
  • FIG. 1 is a flowchart of a method for implementing a bullet time shooting effect according to Embodiment 1 of the present invention.
  • FIG. 2 is a block diagram showing a specific structure of a panoramic camera according to Embodiment 3 of the present invention.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • a method for implementing a bullet time shooting effect according to Embodiment 1 of the present invention includes the following steps: It should be noted that if substantially the same result is obtained, the method for realizing the bullet time shooting effect of the present invention is not illustrated. The sequence of processes shown in 1 is limited.
  • the panoramic video captured when the panoramic camera rotates around the shooting target may specifically be photographed by:
  • the photographer rotates the panoramic camera around the photographer by tilting the auxiliary line or the selfie stick connected to the panoramic camera above the head while photographing the motion state of the object and/or person located on the photographer side.
  • S102 may specifically be:
  • the method may further include the following steps:
  • Anti-shake processing is performed on the stitched image, and the coordinate system of the photographing area is kept in line with the earth coordinate system.
  • S104 is specifically:
  • the change of the viewpoint is that V rotates around the z-axis to the equal-longitude position V 0 of V', and the rotation matrix is R 0 ; on the equal-longitude line, V 0 to V′, the rotation matrix is R 1 ,
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the second embodiment of the present invention provides a computer readable storage medium, where the computer readable storage medium stores a computer program, and when the computer program is executed by the processor, the bullet time shooting effect is implemented as provided in the first embodiment of the present invention.
  • the steps of the method are not limited to:
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • a panoramic camera 100 includes:
  • the processor 101 performs the steps of the method for implementing the bullet time shooting effect provided by the first embodiment of the present invention when the processor 101 executes the computer program.
  • a panoramic video is captured when the panoramic camera rotates around the shooting target; a hemispherical image near the shooting target side is acquired from the panoramic video; the hemispherical image is stitched to generate a stitched image; and then the viewpoint of the stitched image is fixed, thereby realizing the bullet Time shooting effect. That is, only one panoramic camera is required to shoot the bullet time shooting effect, so the shooting time of the bullet time shooting effect of the invention is low, and since the bullet time shooting effect is to shoot the panoramic video when the panoramic camera rotates around the shooting target, the The panoramic video is processed, so the precision is high.
  • the program may be stored in a computer readable storage medium, and the storage medium may include: Read Only Memory (ROM), Random Access Memory (RAM), disk or optical disk.
  • ROM Read Only Memory
  • RAM Random Access Memory

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Studio Devices (AREA)
  • Image Processing (AREA)
  • Television Signal Processing For Recording (AREA)
  • Stereoscopic And Panoramic Photography (AREA)

Abstract

本发明提供了一种实现子弹时间拍摄效果的方法及全景相机。所述方法包括：获取全景相机围绕拍摄目标旋转时拍摄的全景视频；从全景视频中获取靠近拍摄目标侧的半球图像；对半球图像进行拼接生成拼接图像；固定拼接图像的视点，实现子弹时间拍摄效果。本发明只需要一部全景相机就能拍摄出子弹时间拍摄效果，因此本发明实现子弹时间拍摄效果的拍摄成本低，而且由于子弹时间拍摄效果是通过全景相机围绕拍摄目标旋转时拍摄全景视频，经对全景视频进行处理得到的，因此精度高。

Description

一种实现子弹时间拍摄效果的方法及全景相机 技术领域
本发明属于图像处理领域，尤其涉及一种实现子弹时间拍摄效果的方法及全景相机。
背景技术
子弹时间(Bullet time)是一种使用在电影、电视广告或电脑游戏中，用计算机辅助的摄影技术模拟变速特效，例如强化的慢镜头、时间静止等效果。子弹时间拍摄效果最初是用一系列围绕物体的静止照相机(而非摄影机)实现的。这些照相机阵列通常被同时或者顺序触发快门。把每个照相机拍摄的每一帧照片组合起来就可以构成对静止物体的视角旋转效果，或者超级慢镜头效果。理论上虚拟摄影机可以达到无限的视角和帧刷新率，但用静止照相机实现起来却通常受到拍摄路径的限制。子弹时间的特点是不但在时间上极端变化，而且在空间上极端变化：在慢镜头的同时拍摄角度(观众视角)也围绕场景旋转。子弹时间被广泛应用于影视、广告、MV、创意活动等领域。然而，子弹时间这一视觉特效看似华丽，但制作起来却较为繁琐。传统照相机无法在高速运动的同时时刻保持拍摄视角对目标物体取景，因此，实现子弹时间拍摄效果需要事先安置多台照相机在拍摄路径，通过控制照相机的曝光顺序，拍摄帧序列，经过后期合成，达到子弹时间的拍摄效果。现有实现子弹时间拍摄效果的系统，因照相机数量繁多，控制不精确而导致拍摄进度缓慢，无法适应拍摄需要，且价格昂贵，拍摄成本高。
技术问题
本发明的目的在于提供一种实现子弹时间拍摄效果的方法、计算机可读存储介质及全景相机，旨在解决现有技术因照相机数量繁多，控制不精确而导致拍摄进度缓慢，无法适应拍摄需要，且价格昂贵，拍摄成本高的问题。
技术解决方案
第一方面，本发明提供了一种实现子弹时间拍摄效果的方法，所述方法包括：
获取全景相机围绕拍摄目标旋转时拍摄的全景视频；
从全景视频中获取靠近拍摄目标侧的半球图像；
对半球图像进行拼接生成拼接图像；
固定拼接图像的视点，实现子弹时间拍摄效果。
第二方面，本发明提供了一种计算机可读存储介质，所述计算机可读存储介质存储有计算机程序，所述计算机程序被处理器执行时实现如上述的实现子弹时间拍摄效果的方法的步骤。
第三方面，本发明提供了一种全景相机，包括一个或多个处理器、与处理器连接的存储器以及一个或多个计算机程序，其中所述一个或多个计算机程序被存储在所述存储器中，并且被配置成由所述一个或多个处理器执行，所述处理器执行所述计算机程序时实现如上述的实现子弹时间拍摄效果的方法的步骤。
有益效果
在本发明中，由于全景相机围绕拍摄目标旋转时拍摄全景视频；从全景视频中获取靠近拍摄目标侧的半球图像；对半球图像进行拼接生成拼接图像；然后固定拼接图像的视点，从而实现了子弹时间拍摄效果。即只需要一部全景相机就能拍摄出子弹时间拍摄效果，因此本发明实现子弹时间拍摄效果的拍摄成本低，而且由于子弹时间拍摄效果是通过全景相机围绕拍摄目标旋转时拍摄全景视频，经对全景视频进行处理得到的，因此精度高。
附图说明
图1是本发明实施例一提供的实现子弹时间拍摄效果的方法的流程图。
图2是本发明实施例三提供的全景相机的具体结构框图。
本发明的实施方式
为了使本发明的目的、技术方案及有益效果更加清楚明白，以下结合附图 及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
为了说明本发明所述的技术方案，下面通过具体实施例来进行说明。
实施例一：
请参阅图1，本发明实施例一提供的实现子弹时间拍摄效果的方法包括以下步骤：需注意的是，若有实质上相同的结果，本发明的实现子弹时间拍摄效果的方法并不以图1所示的流程顺序为限。
S101、获取全景相机围绕拍摄目标旋转时拍摄的全景视频。
在本发明实施例一中，当拍摄目标是拍摄者时，所述全景相机围绕拍摄目标旋转时拍摄的全景视频具体可以是通过以下方式拍摄的：
拍摄者在头的上方通过甩动连接全景相机的辅助线或自拍杆，使全景相机围绕拍摄者旋转，同时拍摄位于拍摄者侧的物体和/或人的运动状态。
为了实现最佳的子弹时间拍摄效果，最好在甩动自拍杆或辅助线时，使全景相机保持在与拍摄者的身体垂直的水平面上旋转。
S102、从全景视频中获取靠近拍摄目标侧的半球图像。
在本发明实施例一中，S102具体可以为：
调整摄像头传感器的寄存器中采样图像的起始坐标和终点坐标，使采样图像的取样范围是靠近拍摄目标侧的半球。
S103、对半球图像进行拼接生成拼接图像。
在本发明实施例一中，S103之后，所述方法还可以包括以下步骤：
对拼接图像进行防抖处理，保持拍摄区域方向坐标系与地球坐标系一致。
S104、固定拼接图像的视点，实现子弹时间拍摄效果。
在本发明实施例一中，S104具体为：
将拼接图像的视点固定到拍摄目标方向，实现对拍摄目标区域的取景。
正常防抖模式下，视点的变化为，V绕z轴旋转到V’的等经度位置V 0，旋转矩阵为R 0；在等经度线上旋转V 0到V’，旋转矩阵为R 1，为保证防抖处 理后原始的视点不变，并且取景图像的方向符合人的习惯，同时实现防抖，需要将视点方向V’逆向调整回去，最终防抖变换矩阵为R 2＝R 0’×R 1’×R；
其中,V为地球坐标系下视点中心与拼接图像中心的矢量，V＝(0,0,-1)，V'为经过对拼接图像进行防抖处理后的矢量，V'＝(x’,y’,z’)，V’＝R*V，R为防抖算法计算的原始旋转矩阵，R 0＝exp(φ[k 0] ×)，R 1＝exp(θ[k 1] ×)，k 0＝(0,0,1) T为z轴方向,k 1＝(-sin(φ),cos(φ),0) T为经度为等经度旋转轴，φ＝atan 2(y'，x')为经度方向，
Figure PCTCN2018113720-appb-000001
为纬度方向。
实施例二：
本发明实施例二提供了一种计算机可读存储介质，所述计算机可读存储介质存储有计算机程序，所述计算机程序被处理器执行时实现如本发明实施例一提供的实现子弹时间拍摄效果的方法的步骤。
实施例三：
图2示出了本发明实施例三提供的全景相机100的具体结构框图，一种全景相机100，包括：
一个或多个处理器101；以及与处理器连接的存储器102；一个或多个计算机程序，其中所述一个或多个计算机程序被存储在所述存储器102中，并且被配置成由所述一个或多个处理器101执行，所述处理器101执行所述计算机程序时实现如本发明实施例一提供的实现子弹时间拍摄效果的方法的步骤。
在本发明中，由于全景相机围绕拍摄目标旋转时拍摄全景视频；从全景视频中获取靠近拍摄目标侧的半球图像；对半球图像进行拼接生成拼接图像；然后固定拼接图像的视点，从而实现了子弹时间拍摄效果。即只需要一部全景相机就能拍摄出子弹时间拍摄效果，因此本发明实现子弹时间拍摄效果的拍摄成本低，而且由于子弹时间拍摄效果是通过全景相机围绕拍摄目标旋转时拍摄全景视频，经对全景视频进行处理得到的，因此精度高。
本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步骤是可以通过程序来指令相关的硬件来完成，该程序可以存储于一计算机可读存储介质中，存储介质可以包括：只读存储器(ROM，Read Only Memory)、随机存取记忆体(RAM，Random Access Memory)、磁盘或光盘等。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (9)

  1. 一种实现子弹时间拍摄效果的方法，其特征在于，所述方法包括：
    获取全景相机围绕拍摄目标旋转时拍摄的全景视频；
    从全景视频中获取靠近拍摄目标侧的半球图像；
    对半球图像进行拼接生成拼接图像；
    固定拼接图像的视点，实现子弹时间拍摄效果。
  2. 如权利要求1所述的方法，其特征在于，当拍摄目标是拍摄者时，所述全景相机围绕拍摄目标旋转时拍摄的全景视频具体是通过以下方式拍摄的：
    拍摄者在头的上方通过甩动连接全景相机的辅助线或自拍杆，使全景相机围绕拍摄者旋转，同时拍摄位于拍摄者侧的物体和/或人的运动状态。
  3. 如权利要求2所述的方法，其特征在于，在甩动自拍杆或辅助线时，使全景相机保持在与拍摄者的身体垂直的水平面上旋转。
  4. 如权利要求1所述的方法，其特征在于，所述从全景视频中获取靠近拍摄目标侧的半球图像具体为：
    调整摄像头传感器的寄存器中采样图像的起始坐标和终点坐标，使采样图像的取样范围是靠近拍摄目标侧的半球。
  5. 如权利要求1所述的方法，其特征在于，所述对半球图像进行拼接生成拼接图像之后，所述方法还包括：
    对拼接图像进行防抖处理，保持拍摄区域方向坐标系与地球坐标系一致。
  6. 如权利要求1或5所述的方法，其特征在于，所述固定拼接图像的视点具体为：
    将拼接图像的视点固定到拍摄目标方向，实现对拍摄目标区域的取景。
  7. 如权利要求5所述的方法，其特征在于，所述固定拼接图像的视点具体为：
    正常防抖模式下，视点的变化为，V绕z轴旋转到V’的等经度位置V 0，旋转矩阵为R 0；在等经度线上旋转V 0到V’，旋转矩阵为R 1，最终防抖变换矩阵为R 2＝R 0’×R 1’×R；其中,V为地球坐标系下视点中心与拼接图像中 心的矢量，V＝(0,0,-1)，V'为经过对拼接图像进行防抖处理后的矢量，V'＝(x’,y’,z’)，V’＝R*V，R为防抖算法计算的原始旋转矩阵，R 0＝exp(φ[k 0] ×)，R 1＝exp(θ[k 1] ×)，k 0＝(0,0,1) T为z轴方向,k 1＝(-sin(φ),cos(φ),0) T为经度为等经度旋转轴，φ＝atan 2(y'，x')为经度方向，
    Figure PCTCN2018113720-appb-100001
    为纬度方向。
  8. 一种计算机可读存储介质，所述计算机可读存储介质存储有计算机程序，其特征在于，所述计算机程序被处理器执行时实现如权利要求1至7任一项所述的实现子弹时间拍摄效果的方法的步骤。
  9. 一种全景相机，包括一个或多个处理器、与处理器连接的存储器以及一个或多个计算机程序，其中所述一个或多个计算机程序被存储在所述存储器中，并且被配置成由所述一个或多个处理器执行，其特征在于，所述处理器执行所述计算机程序时实现如权利要求1至7任一项所述的实现子弹时间拍摄效果的方法的步骤。
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