QCameraImageProcessing Class

The QCameraImageProcessing class provides an interface for image processing related camera settings. More...

Header:	#include <QCameraImageProcessing>
qmake:	QT += multimedia
Inherits:	QObject

• List of all members, including inherited members

Public Types

enum	ColorFilter { ColorFilterNone, ColorFilterGrayscale, ColorFilterNegative, ColorFilterSolarize, ColorFilterSepia, …, ColorFilterVendor }
enum	WhiteBalanceMode { WhiteBalanceAuto, WhiteBalanceManual, WhiteBalanceSunlight, WhiteBalanceCloudy, WhiteBalanceShade, …, WhiteBalanceVendor }

Public Functions

qreal	brightness() const
QCameraImageProcessing::ColorFilter	colorFilter() const
qreal	contrast() const
qreal	denoisingLevel() const
bool	isAvailable() const
bool	isColorFilterSupported(QCameraImageProcessing::ColorFilter filter) const
bool	isWhiteBalanceModeSupported(QCameraImageProcessing::WhiteBalanceMode mode) const
qreal	manualWhiteBalance() const
qreal	saturation() const
void	setBrightness(qreal value)
void	setColorFilter(QCameraImageProcessing::ColorFilter filter)
void	setContrast(qreal value)
void	setDenoisingLevel(qreal level)
void	setManualWhiteBalance(qreal colorTemperature)
void	setSaturation(qreal value)
void	setSharpeningLevel(qreal level)
void	setWhiteBalanceMode(QCameraImageProcessing::WhiteBalanceMode mode)
qreal	sharpeningLevel() const
QCameraImageProcessing::WhiteBalanceMode	whiteBalanceMode() const

Protected Functions

virtual

~QCameraImageProcessing()

Detailed Description

After capturing the data for a camera frame, the camera hardware and software performs various image processing tasks to produce a final image. This includes compensating for ambient light color, reducing noise, as well as making some other adjustments to the image.

You can retrieve this class from an instance of a QCamera object.

For example, you can set the white balance (or color temperature) used for processing images:

camera = new QCamera;
QCameraImageProcessing *imageProcessing = camera->imageProcessing();

if (imageProcessing->isAvailable()) {
    imageProcessing->setWhiteBalanceMode(QCameraImageProcessing::WhiteBalanceFluorescent);
}

Or adjust the amount of denoising performed:

imageProcessing->setDenoisingLevel(-0.3); //reduce the amount of denoising applied

In some cases changing these settings may result in a longer delay before an image is ready.

For more information on image processing of camera frames, see Camera Image Processing.

See also QCameraImageProcessingControl.

Member Type Documentation

enum QCameraImageProcessing::ColorFilter

Constant	Value	Description
QCameraImageProcessing::ColorFilterNone	0	No filter is applied to images.
QCameraImageProcessing::ColorFilterGrayscale	1	A grayscale filter.
QCameraImageProcessing::ColorFilterNegative	2	A negative filter.
QCameraImageProcessing::ColorFilterSolarize	3	A solarize filter.
QCameraImageProcessing::ColorFilterSepia	4	A sepia filter.
QCameraImageProcessing::ColorFilterPosterize	5	A posterize filter.
QCameraImageProcessing::ColorFilterWhiteboard	6	A whiteboard filter.
QCameraImageProcessing::ColorFilterBlackboard	7	A blackboard filter.
QCameraImageProcessing::ColorFilterAqua	8	An aqua filter.
QCameraImageProcessing::ColorFilterVendor	1000	The base value for vendor defined filters.

This enum was introduced or modified in Qt 5.5.

enum QCameraImageProcessing::WhiteBalanceMode

Constant	Value	Description
QCameraImageProcessing::WhiteBalanceAuto	0	Auto white balance mode.
QCameraImageProcessing::WhiteBalanceManual	1	Manual white balance. In this mode the white balance should be set with setManualWhiteBalance()
QCameraImageProcessing::WhiteBalanceSunlight	2	Sunlight white balance mode.
QCameraImageProcessing::WhiteBalanceCloudy	3	Cloudy white balance mode.
QCameraImageProcessing::WhiteBalanceShade	4	Shade white balance mode.
QCameraImageProcessing::WhiteBalanceTungsten	5	Tungsten (incandescent) white balance mode.
QCameraImageProcessing::WhiteBalanceFluorescent	6	Fluorescent white balance mode.
QCameraImageProcessing::WhiteBalanceFlash	7	Flash white balance mode.
QCameraImageProcessing::WhiteBalanceSunset	8	Sunset white balance mode.
QCameraImageProcessing::WhiteBalanceVendor	1000	Base value for vendor defined white balance modes.

Member Function Documentation

[virtual protected] QCameraImageProcessing::~QCameraImageProcessing()

Destroys the camera focus object.

qreal QCameraImageProcessing::brightness() const

Returns the brightness adjustment setting.

See also setBrightness().

QCameraImageProcessing::ColorFilter QCameraImageProcessing::colorFilter() const

Returns the color filter which will be applied to image data captured by the camera.

This function was introduced in Qt 5.5.

See also setColorFilter().

qreal QCameraImageProcessing::contrast() const

Returns the contrast adjustment setting.

See also setContrast().

qreal QCameraImageProcessing::denoisingLevel() const

Returns the denoising adjustment level.

See also setDenoisingLevel().

bool QCameraImageProcessing::isAvailable() const

Returns true if image processing related settings are supported by this camera.

bool QCameraImageProcessing::isColorFilterSupported(QCameraImageProcessing::ColorFilter filter) const

Returns true if a color filter is supported.

This function was introduced in Qt 5.5.

bool QCameraImageProcessing::isWhiteBalanceModeSupported(QCameraImageProcessing::WhiteBalanceMode mode) const

Returns true if the white balance mode is supported.

qreal QCameraImageProcessing::manualWhiteBalance() const

Returns the current color temperature if the current white balance mode is WhiteBalanceManual. For other modes the return value is undefined.

See also setManualWhiteBalance().

qreal QCameraImageProcessing::saturation() const

Returns the saturation adjustment value.

See also setSaturation().

void QCameraImageProcessing::setBrightness(qreal value)

Set the brightness adjustment to value.

Valid brightness adjustment values range between -1.0 and 1.0, with a default of 0.

See also brightness().

void QCameraImageProcessing::setColorFilter(QCameraImageProcessing::ColorFilter filter)

Sets the color filter which will be applied to image data captured by the camera.

This function was introduced in Qt 5.5.

See also colorFilter().

void QCameraImageProcessing::setContrast(qreal value)

Set the contrast adjustment to value.

Valid contrast adjustment values range between -1.0 and 1.0, with a default of 0.

See also contrast().

void QCameraImageProcessing::setDenoisingLevel(qreal level)

Sets the denoising adjustment level.

Valid denoising values range between -1.0 and 1.0, with a default of 0.

If the parameter value is set to 0, the amount of denoising applied is selected by camera and depends on camera capabilities and settings. Changing value in -1.0..1.0 range adjusts the amount of denoising applied within the supported range.

See also denoisingLevel().

void QCameraImageProcessing::setManualWhiteBalance(qreal colorTemperature)

Sets manual white balance to colorTemperature. This is used when whiteBalanceMode() is set to WhiteBalanceManual. The units are Kelvin.

See also manualWhiteBalance().

void QCameraImageProcessing::setSaturation(qreal value)

Sets the saturation adjustment value to value.

Valid saturation values range between -1.0 and 1.0, with a default of 0.

See also saturation().

void QCameraImageProcessing::setSharpeningLevel(qreal level)

Sets the sharpening adjustment level.

Valid sharpening values range between -1.0 and 1.0, with a default of 0.

See also sharpeningLevel().

void QCameraImageProcessing::setWhiteBalanceMode(QCameraImageProcessing::WhiteBalanceMode mode)

Sets the white balance to mode.

See also whiteBalanceMode().

qreal QCameraImageProcessing::sharpeningLevel() const

Returns the sharpening adjustment level.

See also setSharpeningLevel().

QCameraImageProcessing::WhiteBalanceMode QCameraImageProcessing::whiteBalanceMode() const

Returns the white balance mode being used.

See also setWhiteBalanceMode().