相机图片元数据
ARCore 允许您使用 ImageMetadata
从
相机图片拍摄结果。下面列出了一些常见类型的相机图像元数据
比如焦距、图片时间戳数据或光线情况
信息。
Android Camera
模块可以记录 160 个或更多与图片相关的参数
具体取决于设备的功能。有关
可能的元数据键,请参阅 ImageMetadata
。
使用getImageMetadata()
以获取特定的元数据键值对,并捕获 MetadataNotFoundException
。
。以下示例展示了如何获取
SENSOR_EXPOSURE_TIME
元数据键值对。
Java
// Obtain the SENSOR_EXPOSURE_TIME metadata value from the frame.
Long getSensorExposureTime(Frame frame) {
try {
// Can throw NotYetAvailableException when sensors data is not yet available.
ImageMetadata metadata = frame.getImageMetadata();
// Get the exposure time metadata. Throws MetadataNotFoundException if it's not available.
return metadata.getLong(ImageMetadata.SENSOR_EXPOSURE_TIME);
} catch (MetadataNotFoundException | NotYetAvailableException exception) {
return null;
}
}
Kotlin
// Obtain the SENSOR_EXPOSURE_TIME metadata value from the frame.
fun getSensorExposureTime(frame: Frame): Long? {
return runCatching {
// Can throw NotYetAvailableException when sensors data is not yet available.
val metadata = frame.imageMetadata
// Get the exposure time metadata. Throws MetadataNotFoundException if it's not available.
return metadata.getLong(ImageMetadata.SENSOR_EXPOSURE_TIME)
}
.getOrNull()
}
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最后更新时间 (UTC):2024-10-14。
[null,null,["最后更新时间 (UTC):2024-10-14。"],[[["ARCore provides access to camera image metadata like focal length, timestamp, and lighting information using `ImageMetadata`."],["Android's `Camera` module can record over 160 image parameters, which can be accessed through the `ImageMetadata` class."],["Developers can retrieve specific metadata values using `getImageMetadata()`, while handling potential exceptions like `MetadataNotFoundException`."],["The provided Java and Kotlin code snippets demonstrate how to obtain the `SENSOR_EXPOSURE_TIME` metadata value from a frame."]]],["ARCore utilizes `ImageMetadata` to access camera image capture metadata, such as focal length, timestamps, and lighting. The Android `Camera` module can record over 160 parameters per frame. To retrieve a specific key value, use `getImageMetadata()`, handling `MetadataNotFoundException`. The example demonstrates fetching the `SENSOR_EXPOSURE_TIME` metadata, using `getLong()` method and handling `NotYetAvailableException` if sensor data is unavailable. Refer to the `ImageMetadata` documentation for the complete list of available keys.\n"]]