Qt 5.6 | Qt Multimedia | C++ Classes | QCameraImageProcessing

Qt 5.6.2 Reference Documentation

# 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, ..., ColorFilterVendor }
enum | WhiteBalanceMode { WhiteBalanceAuto, WhiteBalanceManual, WhiteBalanceSunlight, WhiteBalanceCloudy, ..., WhiteBalanceVendor }

## Public Functions

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 | 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

- 31 public functions inherited from QObject

### Additional Inherited Members

- 1 property inherited from QObject
- 1 public slot inherited from QObject
- 2 signals inherited from QObject
- 1 public variable inherited from QObject
- 10 static public members inherited from QObject
- 9 protected functions inherited from QObject
- 2 protected variables inherited from QObject

## Detailed Description

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

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

### 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::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 sharpening 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().