Camera — Kivy 2.3.0 documentation

Camera¶  相机

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Module: kivy.uix.camera

Added in 1.0.0

The Camera widget is used to capture and display video from a camera. Once the widget is created, the texture inside the widget will be automatically updated. Our CameraBase implementation is used under the hood:
Camera 控件用于从摄像头捕获并显示视频。一旦该控件被创建，控件内部的纹理将自动更新。在内部，我们使用了 CameraBase 的实现：

cam = Camera()

By default, the first camera found on your system is used. To use a different camera, set the index property:
默认情况下，将使用您系统中找到的第一个摄像头。要使用不同的摄像头，请设置索引属性（index property）：

cam = Camera(index=1)

You can also select the camera resolution:  您还可以选择摄像头的分辨率： 
resolution   美/ˌrezəˈluːʃ(ə)n/ （电视、照相机、显微镜等的）清晰度，分辨率；

cam = Camera(resolution=(320, 240))

Warning

The camera texture is not updated as soon as you have created the object. The camera initialization is asynchronous, so there may be a delay before the requested texture is created.

在创建对象之后，摄像头的纹理并不会立即更新。摄像头的初始化是异步的，因此在请求的纹理被创建之前可能会有延迟。

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class kivy.uix.camera.Camera(**kwargs)¶

Bases: kivy.uix.image.Image

Camera class. See module documentation for more information.
 

index¶

Index of the used camera, starting from 0. 使用的相机的索引，从0开始

index is a NumericProperty and defaults to -1 to allow auto selection.

play¶     播放

Boolean indicating whether the camera is playing or not. You can start/stop the camera by setting this property:
布尔值，指示摄像头是否正在播放。您可以通过设置此属性来启动/停止摄像头：

# start the camera playing at creation
cam = Camera(play=True)

# create the camera, and start later (default)
cam = Camera(play=False)
# and later
cam.play = True

play is a BooleanProperty and defaults to False. play是一个波尔值属性 并且默认是 False

resolution¶    分辨率

Preferred resolution to use when invoking the camera. If you are using [-1, -1], the resolution will be the default one:
当你调用相机时，建议使用的首选分辨率。如果你使用的是[-1, -1]，那么分辨率将会是默认的：

# create a camera object with the best image available
cam = Camera()

# create a camera object with an image of 320x240 if possible
cam = Camera(resolution=(320, 240))

Warning

Depending on the implementation, the camera may not respect this property.

resolution is a ListProperty and defaults to [-1, -1].