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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ML Kit
简介
|
43
我们可以看到其中只包含一个图像和一个按钮，但至少我们的图像已经加载到 ImageView
中！接下来，我们将对按钮进行编码并让它为我们调用 ML Kit 的人脸检测器！
3.1.6
第
6
步：调用人脸检测器
人脸检测 API（
https://oreil.ly/CPJWS
）有许多你可以调用的选项，并且可以通过
FaceDetectorOptions
对象来访问这些选项。我不打算在这里详细介绍所有可用的选
项
—
你可以查看相关文档
—
但在调用 API 之前，你需要设置用于调用 API 的选项。
这是使用
FaceDetectorOptions.Builder()
对象完成的，下面是一个示例：
val highAccuracyOpts = FaceDetectorOptions.Builder()
.setPerformanceMode(FaceDetectorOptions.PERFORMANCE_MODE_FAST)
.build()
你可以在此处为面部的各种标志或分类（例如睁眼或闭眼）设置许多选项，但由于只是
做一个边界框，因此我选择了一组简单的选项，这样能让它快一点！（如果你想让它更准
确，那么可以使用
PERFORMANCE_MODE_ACCURATE
，它需要的时间会更长一些，并且在一
个场景中有多个人脸时可能表现得更好。）
接下来，你将使用这些选项创建检测器的实例，并将位图传递给它。由于位图是空类型
（即
Bitmap?
），而
InputImage.fromBitmap
不会采用空类型，因此你可以使用后缀 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.