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ARCore lets you useImageMetadatato access metadata key values from the
camera image capture result. Some common types of camera image metadata you
might want to access are focal length, image timestamp data, or lighting
information.
The AndroidCameramodule can record 160 or more parameters about the image
for each frame captured, depending on a device's capabilities. For a list of all
possible metadata keys, seeImageMetadata.
Get the value of an individual metadata key
UsegetImageMetadata()to get a specific metadata key value, and catch theMetadataNotFoundExceptionif it's not available. The following example shows obtaining theSENSOR_EXPOSURE_TIMEmetadata key value.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2024-10-31 UTC."],[[["\u003cp\u003eARCore provides access to camera image metadata like focal length, timestamp, and lighting information using \u003ccode\u003eImageMetadata\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eAndroid's \u003ccode\u003eCamera\u003c/code\u003e module can record over 160 image parameters, which can be accessed through the \u003ccode\u003eImageMetadata\u003c/code\u003e class.\u003c/p\u003e\n"],["\u003cp\u003eDevelopers can retrieve specific metadata values using \u003ccode\u003egetImageMetadata()\u003c/code\u003e, while handling potential exceptions like \u003ccode\u003eMetadataNotFoundException\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe provided Java and Kotlin code snippets demonstrate how to obtain the \u003ccode\u003eSENSOR_EXPOSURE_TIME\u003c/code\u003e metadata value from a frame.\u003c/p\u003e\n"]]],["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"],null,["# Camera image metadata\n\nARCore lets you use `ImageMetadata` to access metadata key values from the\ncamera image capture result. Some common types of camera image metadata you\nmight want to access are focal length, image timestamp data, or lighting\ninformation.\n\nThe Android `Camera` module can record 160 or more parameters about the image\nfor each frame captured, depending on a device's capabilities. For a list of all\npossible metadata keys, see [`ImageMetadata`](/ar/reference/java/com/google/ar/core/ImageMetadata).\n\nGet the value of an individual metadata key\n-------------------------------------------\n\nUse [`getImageMetadata()`](/ar/reference/java/com/google/ar/core/Frame#getImageMetadata-)\nto get a specific metadata key value, and catch the [`MetadataNotFoundException`](/ar/reference/java/com/google/ar/core/exceptions/MetadataNotFoundException)\nif it's not available. The following example shows obtaining the\n`SENSOR_EXPOSURE_TIME` metadata key value. \n\n### Java\n\n```java\n// Obtain the SENSOR_EXPOSURE_TIME metadata value from the frame.\nLong getSensorExposureTime(Frame frame) {\n try {\n // Can throw NotYetAvailableException when sensors data is not yet available.\n ImageMetadata metadata = frame.getImageMetadata();\n\n // Get the exposure time metadata. Throws MetadataNotFoundException if it's not available.\n return metadata.getLong(ImageMetadata.SENSOR_EXPOSURE_TIME);\n } catch (MetadataNotFoundException | NotYetAvailableException exception) {\n return null;\n }\n}\n```\n\n### Kotlin\n\n```kotlin\n// Obtain the SENSOR_EXPOSURE_TIME metadata value from the frame.\nfun getSensorExposureTime(frame: Frame): Long? {\n return runCatching {\n // Can throw NotYetAvailableException when sensors data is not yet available.\n val metadata = frame.imageMetadata\n\n // Get the exposure time metadata. Throws MetadataNotFoundException if it's not available.\n return metadata.getLong(ImageMetadata.SENSOR_EXPOSURE_TIME)\n }\n .getOrNull()\n}\n```"]]
