QCameraImageProcessing Class

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

頭：	#include <QCameraImageProcessing>
qmake:	QT += multimedia
繼承：	QObject

• 所有成員列錶，包括繼承成員

公共類型

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

公共函數

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

保護函數

virtual

~QCameraImageProcessing ()

詳細描述

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 對象。

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 攝像頭圖像處理 .

另請參閱 QCameraImageProcessingControl .

成員類型文檔編製

enum QCameraImageProcessing:: ColorFilter

常量	值	描述
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.

該枚舉在 Qt 5.5 引入或被修改。

enum QCameraImageProcessing:: WhiteBalanceMode

常量	值	描述
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.

成員函數文檔編製

[virtual protected] QCameraImageProcessing:: ~QCameraImageProcessing ()

Destroys the camera focus object.

qreal QCameraImageProcessing:: brightness () const

Returns the brightness adjustment setting.

另請參閱 setBrightness ().

QCameraImageProcessing::ColorFilter QCameraImageProcessing:: colorFilter () const

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

該函數在 Qt 5.5 引入。

另請參閱 setColorFilter ().

qreal QCameraImageProcessing:: contrast () const

Returns the contrast adjustment setting.

另請參閱 setContrast ().

qreal QCameraImageProcessing:: denoisingLevel () const

Returns the denoising adjustment level.

另請參閱 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.

該函數在 Qt 5.5 引入。

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.

另請參閱 setManualWhiteBalance ().

qreal QCameraImageProcessing:: saturation () const

Returns the saturation adjustment value.

另請參閱 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.

另請參閱 brightness ().

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

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

該函數在 Qt 5.5 引入。

另請參閱 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.

另請參閱 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.

另請參閱 denoisingLevel ().

void QCameraImageProcessing:: setManualWhiteBalance ( qreal colorTemperature )

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

另請參閱 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.

另請參閱 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.

另請參閱 sharpeningLevel ().

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

Sets the white balance to mode .

另請參閱 whiteBalanceMode ().

qreal QCameraImageProcessing:: sharpeningLevel () const

Returns the sharpening adjustment level.

另請參閱 setSharpeningLevel ().

QCameraImageProcessing::WhiteBalanceMode QCameraImageProcessing:: whiteBalanceMode () const

Returns the white balance mode being used.

另請參閱 setWhiteBalanceMode ().

內容

1. 公共類型

2. 公共函數

3. 保護函數

4. 詳細描述