ImageCapture QML Type

An interface for capturing camera images. More...

Import Statement: import QtMultimedia

List of all members, including inherited members

Properties

error : enumeration
errorString : string
fileFormat : enumeration
metaData : mediaMetaData
preview : string
quality : enumeration
readyForCapture : bool

Signals

errorOccurred(id, error, errorString)
imageCaptured(requestId, preview)
imageMetadataAvailable(id, metaData)
imageSaved(id, fileName)

Methods

capture()
captureToFile(location)
saveToFile(location)

Detailed Description

This type allows you to capture still images and be notified when they are available or saved to disk.

 Item {
     width: 640
     height: 360

     CaptureSession {
         imageCapture : ImageCapture {
             id: imageCapture
         }
         camera: Camera {
             id: camera
         }

         videoOutput: videoOutput
     }
     VideoOutput {
         id: videoOutput
         anchors.fill: parent

         MouseArea {
             anchors.fill: parent;
             onClicked: imageCapture.capture();
         }
     }

     Image {
         id: photoPreview
         source: imageCapture.preview // always shows the last captured image
     }
 }

Property Documentation

error : enumeration [read-only]

This property holds the last error type that occurred. It can be one of the following.

Constant	Description
`ImageCapture.NoError`	No esrrors.
`ImageCapture.NotReadyError`	The service is not ready for capture yet.
`ImageCapture.ResourceError`	Device is not ready or not available.
`ImageCapture.OutOfSpaceError`	No space left on device.
`ImageCapture.NotSupportedFeatureError`	Device does not support stillimages capture.
`ImageCapture.FormatError`	Current format is not supported.

See also errorString.

errorString : string [read-only]

This property holds the last error message that occurred.

See also error.

fileFormat : enumeration

This property holds the file format for which the image will be written. It can be one of the following.

Constant	Description
`UnspecifiedFormat`	No format specified
`JPEG`	`.jpg` or `.jpeg` format
`PNG`	`.png` format
`WebP`	`.webp` format
`Tiff`	`.tiff` format

metaData : mediaMetaData

This property holds the metadata that wil be embedded into the image.

preview : string [read-only]

This property holds a url to the latest captured image. It can be connected to the source property of an Image element to show the last captured image.

 CaptureSession {
     camera: Camera {}
     imageCapture: ImageCapture {
         id: capture
     }
 }
 Image {
     source: capture.preview
 }

See also saveToFile.

quality : enumeration

This property holds the quality hint when storing the captured image. It can be one of the following values.

Constant	Description
`VeryLowQuality`	Very low
`LowQuality`	Low
`NormalQuality`	Normal
`HighQuality`	High
`VeryHighQuality`	Very high

readyForCapture : bool [read-only]

This property holds a bool value indicating whether the camera is ready to capture photos or not.

Calling capture() or captureToFile() while ready is false is not permitted and results in an error.

Signal Documentation

errorOccurred(id, error, errorString)

This signal is emitted when an error occurs during capture with requested id. error is an enumeration of type ImageCapture::Error. A descriptive message is available in errorString.

Note: The corresponding handler is onErrorOccurred.

See also error and errorString.

imageCaptured(requestId, preview)

This signal is emitted when an image with requested id requestId has been captured but not yet saved to the filesystem. The preview parameter is the captured image.

Note: The corresponding handler is onImageCaptured.

See also imageSaved and preview.

imageMetadataAvailable(id, metaData)

This signal is emitted when the image with requested id has new metaData.

Note: The corresponding handler is onImageMetadataAvailable.

See also imageCaptured.

imageSaved(id, fileName)

This signal is emitted after the image with requested id has been written to the filesystem. The fileName is a local file path, not a URL.

Note: The corresponding handler is onImageSaved.

See also imageCaptured.

Method Documentation

capture()

Start image capture. The imageCaptured and imageSaved signals will be emitted when the capture is complete.

The captured image will be available through the preview property that can be used as the source for a QML Image item. The saveToFile() method can then be used save the image.

Camera saves all the capture parameters like exposure settings or image processing parameters, so changes to camera parameters after capture() is called do not affect previous capture requests.

capture() returns the capture requestId parameter, used with imageExposed(), imageCaptured(), imageMetadataAvailable() and imageSaved() signals.

See also readyForCapture and preview.

captureToFile(location)

Does the same as capture() but additionally automatically saves the captured image to the specified location.

See also capture.

saveToFile(location)

Saves the last captured image to location.

See also capture and preview.

Contents

ImageCapture QML Type

Properties

Signals

Methods

Detailed Description

Property Documentation

Signal Documentation

Method Documentation