CODEWITHSUNDEEP
androidkotlincameraandroid-camera2android-camerax
Aseem Bajaj
Aseem Bajaj

Reputation: 23

How to set Exposure compensation in Camera X support library?

I am clicking a photo using CameraX library and want to change exposure settings. What do I do to set the Exposure Compensation or change the exposure settings of picture captured?

// Set up the capture use case to allow users to take photos
val imageCaptureConfig = ImageCaptureConfig.Builder().apply {
    setLensFacing(lensFacing)
    setCaptureMode(CaptureMode.MIN_LATENCY)
    // We request aspect ratio but no resolution to match preview config but letting
    // CameraX optimize for whatever specific resolution best fits requested capture mode
    setTargetAspectRatio(screenAspectRatio)
    // Set initial target rotation, we will have to call this again if rotation changes
    // during the lifecycle of this use case
    setTargetRotation(viewFinder.display.rotation)
}.build()


imageCapture = ImageCapture(imageCaptureConfig)

// Setup image analysis pipeline that computes average pixel luminance in real time
val analyzerConfig = ImageAnalysisConfig.Builder().apply {
    setLensFacing(lensFacing)
    // Use a worker thread for image analysis to prevent preview glitches
    setCallbackHandler(Handler(analyzerThread.looper))
    // In our analysis, we care more about the latest image than analyzing *every* image
    setImageReaderMode(ImageAnalysis.ImageReaderMode.ACQUIRE_LATEST_IMAGE)
    // Set initial target rotation, we will have to call this again if rotation changes
    // during the lifecycle of this use case
    setTargetRotation(viewFinder.display.rotation)
}.build()

Upvotes: 2

Views: 2190

Answers (2)

Saurabh Thorat
Saurabh Thorat

Reputation: 20614

CameraX 1.0.0-beta09 has added an experimental interface for ExposureCompensation

You can set exposure by:

val camera = cameraProvider.bindToLifecycle(viewLifecycleOwner, cameraSelector, preview, imageCapture)
val cameraControl = camera.cameraControl
cameraControl.setExposureCompensationIndex(exposure)

Upvotes: 2

Rammohan Raja
Rammohan Raja

Reputation: 626

val imageCaptureBuilder = ImageCapture.Builder().apply {
    setLensFacing(lensFacing)
    setCaptureMode(CaptureMode.MIN_LATENCY)
    // We request aspect ratio but no resolution to match preview config but letting
    // CameraX optimize for whatever specific resolution best fits requested capture mode
    setTargetAspectRatio(screenAspectRatio)
    // Set initial target rotation, we will have to call this again if rotation changes
    // during the lifecycle of this use case
    setTargetRotation(viewFinder.display.rotation)
}

Camera2Interop.Extender(imageCaptureBuilder).setCaptureRequestOption(
  CaptureRequest.CONTROL_AE_EXPOSURE_COMPENSATION, exposure)
  
imageCapture = imageCaptureBuilder.build()

where exposure is your desired value

Ideally you should query the CONTROL_AE_COMPENSATION_RANGE to set a valid value for exposure.

Upvotes: 3

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