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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请注意检测器模式设置的差异，尽管
ObjectDetectorOptions.STREAM_MODE
现在使用
流模式，因为我们将向其传输图像。这会打开我们在图 4-6 中看到的物体跟踪功能，它
“记住”不同帧中的同一物体，即使由于相机放置而看起来不同。
当你创建像这样的分析器类时，你需要覆盖函数
analyze
，该函数接受一个表示图像的
ImageProxy
对象。要将 CameraX 图像与图像代理一起使用，你需要进行一些处理来管
理旋转等。我不会在此处详细介绍，但要管理的重要事项是：如果相机以横向或纵向模
式提供帧，那么我们需要通知叠加层有关图像的适当高度和宽度，并在必要时翻转它
们
—
以便 ML Kit API 始终接收相同方向的图像：
if (rotationDegrees == 0 || rotationDegrees == 180) {
overlay.setImageSourceInfo(
imageProxy.width, imageProxy.height, isImageFlipped
)
} else {
overlay.setImageSourceInfo(
imageProxy.height, imageProxy.width, isImageFlipped
)
}
然后，我们可以将帧传递给物体检测器，如果成功，回调函数将像以前一样检测到物
体。此时我们应该清除叠加层，然后为每个检测到的物体向叠加层添加新的图形对象。
这些图形对象是此应用程序中的自定义类。你很快就会看到它们 ...
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