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  5. QCameraImageProcessing

QCameraImageProcessing Class

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

头： #include <QCameraImageProcessing>
qmake: QT += multimedia
继承： QObject

公共类型

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

公共函数

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

保护函数

virtual ~QCameraImageProcessing ()

详细描述

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 对象。

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 摄像头图像处理 .

另请参阅 QCameraImageProcessingControl .

成员类型文档编制

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.

该枚举在 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.

成员函数文档编制

[virtual protected] QCameraImageProcessing:: ~QCameraImageProcessing ()

Destroys the camera focus object.

qreal QCameraImageProcessing:: brightness () const

Returns the brightness adjustment setting.

另请参阅 setBrightness ().

QCameraImageProcessing::ColorFilter QCameraImageProcessing:: colorFilter () const

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

该函数在 Qt 5.5 引入。

另请参阅 setColorFilter ().

qreal QCameraImageProcessing:: contrast () const

Returns the contrast adjustment setting.

另请参阅 setContrast ().

qreal QCameraImageProcessing:: denoisingLevel () const

Returns the denoising adjustment level.

另请参阅 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.

该函数在 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.

另请参阅 setManualWhiteBalance ().

qreal QCameraImageProcessing:: saturation () const

Returns the saturation adjustment value.

另请参阅 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.

另请参阅 brightness ().

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

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

该函数在 Qt 5.5 引入。

另请参阅 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.

另请参阅 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.

另请参阅 denoisingLevel ().

void QCameraImageProcessing:: setManualWhiteBalance ( qreal colorTemperature )

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

另请参阅 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.

另请参阅 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.

另请参阅 sharpeningLevel ().

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

Sets the white balance to mode .

另请参阅 whiteBalanceMode ().

qreal QCameraImageProcessing:: sharpeningLevel () const

Returns the sharpening adjustment level.

另请参阅 setSharpeningLevel ().

QCameraImageProcessing::WhiteBalanceMode QCameraImageProcessing:: whiteBalanceMode () const

Returns the white balance mode being used.

另请参阅 setWhiteBalanceMode ().

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