QCameraExposureControl ¶

详细描述 ¶

QCameraExposure class is the usual method of adjusting exposure related parameters when using camera functionality. This class provides a more complete but less easy to use interface, and also forms the interface to implement when writing a new implementation of QCamera 功能。

You can adjust a number of parameters that will affect images and video taken with the corresponding QCamera object - see the ExposureParameter enumeration.

The interface name of QCameraExposureControl is org.qt-project.qt.cameraexposurecontrol/5.0 作为定义在 QCameraExposureControl_iid .

另请参阅

QCameraExposure QCamera

class QCameraExposureControl ( [ parent=None ] ) ¶

param parent

QObject

构造摄像头曝光控制对象采用 parent .

PySide2.QtMultimedia.QCameraExposureControl. ExposureParameter ¶

常量	描述
QCameraExposureControl.ISO	Camera ISO sensitivity, specified as integer value.
QCameraExposureControl.Aperture	Lens aperture is specified as an qreal F number. The supported apertures list can change depending on the focal length, in such a case the exposureParameterRangeChanged() signal is emitted.
QCameraExposureControl.ShutterSpeed	Shutter speed in seconds, specified as qreal.
QCameraExposureControl.ExposureCompensation	Exposure compensation, specified as qreal EV value.
QCameraExposureControl.FlashPower	Manual flash power, specified as qreal value. Accepted power range is [0..1.0], with 0 value means no flash and 1.0 corresponds to full flash power.

此值仅使用于 manual flash mode .

常量	描述
QCameraExposureControl.TorchPower	Manual torch power, specified as qreal value. Accepted power range is [0..1.0], with 0 value means no light and 1.0 corresponds to full torch power.

此值仅使用于 torch flash mode .

常量	描述
QCameraExposureControl.FlashCompensation	Flash compensation, specified as qreal EV value.
QCameraExposureControl.SpotMeteringPoint	The relative frame coordinate of the point to use for exposure metering in spot metering mode, specified as a QPointF .
QCameraExposureControl.ExposureMode	Camera exposure mode.
QCameraExposureControl.MeteringMode	Camera metering mode.
QCameraExposureControl.ExtendedExposureParameter	The base value for platform specific extended parameters. For such parameters the sequential values starting from should be used.

PySide2.QtMultimedia.QCameraExposureControl. actualValue ( 参数 ) ¶

参数

参数 – ExposureParameter

返回类型

object

Returns the actual exposure 参数 value, or invalid QVariant() if the value is unknown or not supported.

The actual parameter value may differ for the requested one if automatic mode is selected or camera supports only limited set of values within the supported range.

PySide2.QtMultimedia.QCameraExposureControl. actualValueChanged ( 参数 ) ¶

参数

参数 – int

PySide2.QtMultimedia.QCameraExposureControl. isParameterSupported ( 参数 ) ¶

参数

参数 – ExposureParameter

返回类型

bool

Returns true is exposure 参数 is supported by backend.

PySide2.QtMultimedia.QCameraExposureControl. parameterRangeChanged ( 参数 ) ¶

参数

参数 – int

PySide2.QtMultimedia.QCameraExposureControl. requestedValue ( 参数 ) ¶

参数

参数 – ExposureParameter

返回类型

object

Returns the requested exposure 参数 值。

PySide2.QtMultimedia.QCameraExposureControl. requestedValueChanged ( 参数 ) ¶

参数

参数 – int

PySide2.QtMultimedia.QCameraExposureControl. setValue ( 参数 , value ) ¶

参数

• 参数 – ExposureParameter

• value – object

返回类型

bool

Set the exposure 参数 to value . If a null or invalid QVariant is passed, backend should choose the value automatically, and if possible report the actual value to user with actualValue() .

Returns true if parameter is supported and value is correct.