January 2023
Intermediate to advanced
288 pages
6h 6m
Chinese
Content preview from 移动端AI与ML应用开发：基于iOS和Android
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Android
上使用
ML Kit
的计算机视觉应用程序
|
71
接下来是图像分析器。 CameraX 逐帧调用此函数，使你能够对图像进行某种处理。这
非常适合我们的需求。当你调用
setAnalyzer
时，你指定了一个处理分析的类。在这
里，我指定了一个名为
ObjectAnalyzer
的类，顾名思义，它将使用具有该帧的物体检
测 API：
val imageAnalyzer = ImageAnalysis.Builder()
.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
.build()
.also {
it.setAnalyzer(cameraExecutor, ObjectAnalyzer(graphicOverlay))
}
然后，一旦有了这些，你就可以将它们绑定到相机的生命周期，以便 CameraX 知道使用
它们来分别渲染预览和管理逐帧处理：
cameraProvider.bindToLifecycle(
this, cameraSelector, preview, imageAnalyzer
)
你可以在 CameraX 文档中了解有关使用 CameraX 的相机应用程序生命周期的更多信息。
我只想在这里强调使用物体检测时的重要部分。
4.3.4 ObjectAnalyzer
类
该类的完整代码位于本书的存储库（
https://oreil.ly/WIQMR
）中。我建议你复制并使用它
来了解物体分析如何用于跟踪视频中的物体。本节仅显示代码的重要部分，并不会真正 ...
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