QCameraImageProcessing Class
The QCameraImageProcessing class provides an interface for image processing related camera settings. More...
| Header: | #include <QCameraImageProcessing> |
| qmake: | QT += multimedia |
| Inherits: | QObject |
Public Types
| enum | ColorFilter { ColorFilterNone, ColorFilterGrayscale, ColorFilterNegative, ColorFilterSolarize, ColorFilterSepia, …, ColorFilterVendor } |
| enum | WhiteBalanceMode { WhiteBalanceAuto, WhiteBalanceManual, WhiteBalanceSunlight, WhiteBalanceCloudy, WhiteBalanceShade, …, WhiteBalanceVendor } |
Public Functions
| qreal | brightness() const |
| ColorFilter | colorFilter() const |
| qreal | contrast() const |
| qreal | denoisingLevel() const |
| bool | isAvailable() const |
| bool | isColorFilterSupported(ColorFilter filter) const |
| bool | isWhiteBalanceModeSupported(WhiteBalanceMode mode) const |
| qreal | manualWhiteBalance() const |
| qreal | saturation() const |
| void | setBrightness(qreal value) |
| void | setColorFilter(ColorFilter filter) |
| void | setContrast(qreal value) |
| void | setDenoisingLevel(qreal level) |
| void | setManualWhiteBalance(qreal colorTemperature) |
| void | setSaturation(qreal value) |
| void | setSharpeningLevel(qreal level) |
| void | setWhiteBalanceMode(WhiteBalanceMode mode) |
| qreal | sharpeningLevel() const |
| 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().
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(ColorFilter filter) const
Returns true if a color filter is supported.
This function was introduced in Qt 5.5.
bool QCameraImageProcessing::isWhiteBalanceModeSupported(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(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(WhiteBalanceMode mode)
Sets the white balance to mode.
See also whiteBalanceMode().
qreal QCameraImageProcessing::sharpeningLevel() const
Returns the sharpening adjustment level.
See also setSharpeningLevel().
WhiteBalanceMode QCameraImageProcessing::whiteBalanceMode() const
Returns the white balance mode being used.
See also setWhiteBalanceMode().