ai.djl.basicdataset.cv

Class CocoUtils

java.lang.Object

ai.djl.basicdataset.cv.CocoUtils

public class CocoUtils
extends java.lang.Object

A utility class that assists in loading and parsing the annotations in Coco.

Method Summary

Modifier and Type	Method and Description
CocoMetadata.Annotation	getAnnotationById(long annotationId) Returns an CocoMetadata.Annotation that corresponds to a given annotation id.
java.util.List<java.lang.Long>	getAnnotationIdByImageId(long imageId) Returns all ids of the annotation that correspond to a given image id.
java.util.List<java.lang.Long>	getImageIds() Returns all image ids in the annotation file.
java.nio.file.Path	getRelativeImagePath(long imageId) Returns the relative path of an image given an image id.
int	mapCategoryId(long originalCategoryId) Returns the continuous category id given an original category id.
void	prepare() Prepares and indexes the annotation file in memory.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

prepare

public void prepare()
             throws java.io.IOException

Prepares and indexes the annotation file in memory.

Throws:

java.io.IOException - if reading the annotation file fails

getImageIds

public java.util.List<java.lang.Long> getImageIds()

Returns all image ids in the annotation file.

Returns:

all image ids in the annotation file

getRelativeImagePath

public java.nio.file.Path getRelativeImagePath(long imageId)

Returns the relative path of an image given an image id.

Parameters:

imageId - the image id to retrieve the path for

Returns:

the relative path of an image

getAnnotationIdByImageId

public java.util.List<java.lang.Long> getAnnotationIdByImageId(long imageId)

Returns all ids of the annotation that correspond to a given image id.

Parameters:

imageId - the image id to retrieve annotations for

Returns:

all ids of the annotation

getAnnotationById

public CocoMetadata.Annotation getAnnotationById(long annotationId)

Returns an CocoMetadata.Annotation that corresponds to a given annotation id.

Parameters:

annotationId - the annotation id to retrieve an annotation for

Returns:

an CocoMetadata.Annotation

mapCategoryId

public int mapCategoryId(long originalCategoryId)

Returns the continuous category id given an original category id.

Parameters:

originalCategoryId - the original category id to retrieve the continuous category id for

Returns:

the continuous category id