Package com.appliedrec.verid.ui2

Class CameraPreviewHelper

java.lang.Object

com.appliedrec.verid.ui2.CameraPreviewHelper

public class CameraPreviewHelper
extends java.lang.Object

Helper class for camera previews

Since:

2.4.0

Constructor Summary

Constructors

Constructor	Description
CameraPreviewHelper()

Method Summary

Modifier and Type	Method	Description
android.util.Size	getCorrectedTextureSize(int imageWidth, int imageHeight, int viewWidth, int viewHeight, int sensorOrientation, int deviceRotation)	Get camera preview texture size corrected to match the device and camera sensor orientation
static CameraPreviewHelper	getInstance()
int	getMinImageArea()
android.util.Size[]	getOutputSizes(android.util.Size[] previewSizes, android.util.Size[] imageReaderSizes, android.util.Size[] videoSizes, int viewWidth, int viewHeight, int sensorRotation, int deviceRotation)	Select a set of camera output sizes
android.graphics.Matrix	getViewTransformMatrix(int imageWidth, int imageHeight, int viewWidth, int viewHeight, int sensorOrientation, int deviceRotation)	Get matrix to transform a texture view with camera preview to upright orientation and to correct its aspect ratio
void	setMinImageArea(int minImageArea)	Set minimum area (width x height in pixels) of images the camera should collect

Methods inherited from class java.lang.Object

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

Constructor Detail

CameraPreviewHelper

public CameraPreviewHelper()

Method Detail

getInstance

public static CameraPreviewHelper getInstance()

Returns:

Singleton instance of `CameraPreviewHelper`

Since:

2.4.0

getMinImageArea

public int getMinImageArea()

Returns:

Minimum area (width x height in pixels) of images collected by the camera

Since:

2.5.0

setMinImageArea

public void setMinImageArea(int minImageArea)

Set minimum area (width x height in pixels) of images the camera should collect

Parameters:

minImageArea - Area (width x height in pixels)

Since:

2.5.0

getViewTransformMatrix

public android.graphics.Matrix getViewTransformMatrix(int imageWidth,
                                                      int imageHeight,
                                                      int viewWidth,
                                                      int viewHeight,
                                                      int sensorOrientation,
                                                      int deviceRotation)

Get matrix to transform a texture view with camera preview to upright orientation and to correct its aspect ratio

Parameters:

imageWidth - Camera image width

imageHeight - Camera image height

viewWidth - Width of the view containing the camera preview texture

viewHeight - Height of the view containing the camera preview texture

sensorOrientation - Camera sensor orientation relative to the device held upright

deviceRotation - Rotation of the device

Returns:

Matrix

Since:

2.4.0

getCorrectedTextureSize

public android.util.Size getCorrectedTextureSize(int imageWidth,
                                                 int imageHeight,
                                                 int viewWidth,
                                                 int viewHeight,
                                                 int sensorOrientation,
                                                 int deviceRotation)

Get camera preview texture size corrected to match the device and camera sensor orientation

Parameters:

imageWidth - Width of the image obtained from the camera

imageHeight - Height of the image obtained from the camera

viewWidth - Width of the texture containing the camera preview

viewHeight - Height of the texture containing the camera preview

sensorOrientation - Camera sensor orientation

deviceRotation - Device rotation

Returns:

Size

Since:

2.4.0

getOutputSizes

public android.util.Size[] getOutputSizes(android.util.Size[] previewSizes,
                                          android.util.Size[] imageReaderSizes,
                                          android.util.Size[] videoSizes,
                                          int viewWidth,
                                          int viewHeight,
                                          int sensorRotation,
                                          int deviceRotation)

Select a set of camera output sizes

Parameters:

previewSizes - Preview size candidates

imageReaderSizes - Image reader size candidates

videoSizes - Video size candidates

viewWidth - Width of the view containing the camera preview

viewHeight - Height of the view containing the camera preview

sensorRotation - Camera sensor rotation in degrees

deviceRotation - Device rotation

Returns:

Set of output sizes best matching the view size

Since:

2.4.0