TransformToGrayscaleOp

public class TransformToGrayscaleOp

Transforms an image to GrayScale as an image processing unit.

Supported color spaces:

• ColorSpaceType.RGB

The conversion is based on OpenCV RGB to GRAY conversion https://docs.opencv.org/master/de/d25/imgproc\_color\_conversions.html#color\_convert\_rgb\_gray

Public Constructors

| | TransformToGrayscaleOp() Creates a TransformToGrayscaleOp.

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Public Methods

| TensorImage | apply(TensorImage image) Applies the transformation to grayscale and returns a TensorImage.

| | int | getOutputImageHeight(int inputImageHeight, int inputImageWidth) Computes the height of the expected output image when input image size is given.

| | int | getOutputImageWidth(int inputImageHeight, int inputImageWidth) Computes the width of the expected output image when input image size is given.

| | PointF | inverseTransform(PointF point, int inputImageHeight, int inputImageWidth) Transforms a point from coordinates system of the result image back to the one of the input image.

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Inherited Methods

From class java.lang.Object

| boolean | equals(Object arg0) | | 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 org.tensorflow.lite.support.image.ImageOperator

| abstract TensorImage | apply(TensorImage image) | | abstract int | getOutputImageHeight(int inputImageHeight, int inputImageWidth) Computes the height of the expected output image when input image size is given.

| | abstract int | getOutputImageWidth(int inputImageHeight, int inputImageWidth) Computes the width of the expected output image when input image size is given.

| | abstract PointF | inverseTransform(PointF point, int inputImageHeight, int inputImageWidth) Transforms a point from coordinates system of the result image back to the one of the input image.

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From interface org.tensorflow.lite.support.common.Operator

| abstract TensorImage | apply(TensorImage x) Applies an operation on a T object, returning a T object.

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Public Constructors

public TransformToGrayscaleOp ()

Creates a TransformToGrayscaleOp.

Public Methods

public TensorImage apply (TensorImage image)

Applies the transformation to grayscale and returns a TensorImage.

If the input image is already ColorSpaceType.GRAYSCALE, this op will be a no-op.

Parameters

| image | |

Throws

| IllegalArgumentException | if the image is not ColorSpaceType.RGB or ColorSpaceType.GRAYSCALE. |

public int getOutputImageHeight (int inputImageHeight, int inputImageWidth)

Computes the height of the expected output image when input image size is given.

Parameters

| inputImageHeight | | | inputImageWidth | |

public int getOutputImageWidth (int inputImageHeight, int inputImageWidth)

Computes the width of the expected output image when input image size is given.

Parameters

| inputImageHeight | | | inputImageWidth | |

public PointF inverseTransform (PointF point, int inputImageHeight, int inputImageWidth)

Transforms a point from coordinates system of the result image back to the one of the input image.

Parameters

| point | the point from the result coordinates system. | | inputImageHeight | the height of input image. | | inputImageWidth | the width of input image. |

Returns

• the point with the coordinates from the coordinates system of the input image.