Android Camera2 increase brightness

Question

I am using android camera2 in my application to take continuous images, Here when I use camera2 getting image preview brightness very dark compare to original camera. I seen this but there is no similar requirement in that answer.

I tried to set brightness in camera2 as suggested here:

Note that this control will only be effective if android.control.aeMode != OFF. This control will take effect even when android.control.aeLock == true.

captureRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);             captureRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON);             captureRequestBuilder.set(CaptureRequest.CONTROL_AE_LOCK, true);             captureRequestBuilder.set(CaptureRequest.CONTROL_AE_EXPOSURE_COMPENSATION, 6); 

But it still showing preview as dark image only as shown below.

See the difference here:

Original Camera:

Using Camera2:

And what is the value I need to pass as second parameter in:

captureRequestBuilder.set(CaptureRequest.CONTROL_AE_EXPOSURE_COMPENSATION, 6); 

I kept 6 because as suggested in doc's:

For example, if the exposure value (EV) step is 0.333, '6' will mean an exposure compensation of +2 EV; -3 will mean an exposure compensation of -1 EV.

But still no effect in brightness..

Answer 1

Here it is:

Add below code in onConfigured() and unlockFocus()

captureRequestBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE,getRange()); 

By using the above code you will get the better preview. But your captured picture will remain as it is. To get the better picture as well use the same below code in captureStillPicture()

captureBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, getRange()); 

getRange is:

    private Range<Integer> getRange() {     CameraCharacteristics chars = null;     try {         chars = mCameraManager.getCameraCharacteristics(mCameraId);         Range<Integer>[] ranges = chars.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES);         Range<Integer> result = null;         for (Range<Integer> range : ranges) {             int upper = range.getUpper();             // 10 - min range upper for my needs             if (upper >= 10) {                 if (result == null || upper < result.getUpper().intValue()) {                     result = range;                 }             }         }         if (result == null) {             result = ranges[0];         }         return result;     } catch (CameraAccessException e) {         e.printStackTrace();         return null;     } }