MlImage

Wraps image data for on-device machine learning (ODML) usages.

MlImage is designed to be an immutable image container, which could be shared cross-platforms, among different Google ODML frameworks(TFLite Support, MLKit).

It is a common abstraction image that could help to chain different frameworks that adapts MlImage together.

To construct an MlImage, use the provided builders:

• ByteBufferMlImageBuilder
• BitmapMlImageBuilder
• MediaMlImageBuilder

MlImage uses reference counting to maintain internal storage. When it is created the reference count is 1. Developer can call close() to reduce reference count to release internal storage earlier, otherwise Java garbage collection will release the storage eventually.

To extract concrete image, first check MlImage.StorageType and then use the provided extractors:

• ByteBufferExtractor
• BitmapExtractor
• MediaImageExtractor

In future release, MlImage will support internal conversion(e.g. Bitmap -> ByteBuffer) and multiple storages.

Nested Class Summary

@interface	MlImage.ImageFormat		Specifies the image format of an image.
class	MlImage.Internal		Advanced API access for MlImage.
@interface	MlImage.StorageType		Specifies the image container type.

Constant Summary

int	IMAGE_FORMAT_ALPHA
int	IMAGE_FORMAT_JPEG
int	IMAGE_FORMAT_NV12
int	IMAGE_FORMAT_NV21
int	IMAGE_FORMAT_RGB
int	IMAGE_FORMAT_RGBA
int	IMAGE_FORMAT_UNKNOWN
int	IMAGE_FORMAT_YUV_420_888
int	IMAGE_FORMAT_YV12
int	IMAGE_FORMAT_YV21
int	STORAGE_TYPE_BITMAP
int	STORAGE_TYPE_BYTEBUFFER
int	STORAGE_TYPE_MEDIA_IMAGE

Public Method Summary

synchronized void	close() Removes a reference that was previously acquired or init.
List<ImageProperties>	getContainedImageProperties() Returns a list of supported image properties for this MlImage.
int	getHeight() Returns the height of the image.
MlImage.Internal	getInternal() Gets MlImage.Internal object which contains internal APIs.
int	getRotation() Returns the rotation value attached to the image.
int	getWidth() Returns the width of the image.

Inherited Method Summary

From class java.lang.Object

Object	clone()
boolean	equals(Object arg0)
void	finalize()
final Class<?>	getClass()
int	hashCode()
final void	notify()
final void	notifyAll()
String	toString()
final void	wait(long arg0, int arg1)
final void	wait(long arg0)
final void	wait()

From interface java.io.Closeable

abstract void

close()

From interface java.lang.AutoCloseable

abstract void

close()