public void AdjustExposure(int E)
{
if (E < 0 || E > 100)
{
return;
}
var error = new NSError();
float range = Math.Abs(maxExposure - minExposure);
float factor = ((float)E / 100);
var targetISO = factor * range + minExposure;
if (device.LockingFocusWithCustomLensPositionSupported)
{
device.LockForConfiguration(out error);
// changing just the shutter speed
//var newDurationSeconds = factor * (maxDuration - minDuration) + minDuration;
//device.LockExposure(CMTime.FromSeconds(newDurationSeconds, 1000 * 1000 * 1000), device.ISO, HandleAction);
// changing just the shutter speed with a factor adjustment to the upper value
//var newDurationSeconds = factor * (maxDuration * 0.02 - minDuration * 0.01) + minDuration;
//device.LockExposure(CMTime.FromSeconds(newDurationSeconds, 1000 * 1000 * 1000),device.ISO,HandleAction);
//changing the iso value
//device.LockExposure(device.ExposureDuration, targetISO, HandleAction);
// changin both iso and shutter speed
//var newDurationSeconds = factor * ( maxDuration - minDuration) + minDuration;
//device.LockExposure(CMTime.FromSeconds(newDurationSeconds, 1000 * 1000 * 1000), targetISO, HandleAction);
// changin both iso and shutter speed { with factor 0.1 adjustment }
if (factor < 0.75)
{
var newDurationSeconds = factor * (maxDuration * 0.0004 - minDuration * 0.0001) + minDuration;
device.LockExposure(CMTime.FromSeconds(newDurationSeconds, 1000 * 1000 * 1000), targetISO, HandleAction);
}
else
{
var newDurationSeconds = Math.Pow(1.26, (100 * factor) - 74) * factor * (maxDuration * 0.0004 - minDuration * 0.0001) + minDuration;
if (newDurationSeconds > maxDuration)
{
newDurationSeconds = maxDuration;
}
device.LockExposure(CMTime.FromSeconds(newDurationSeconds, 1000 * 1000 * 1000), targetISO, HandleAction);
}
device.UnlockForConfiguration();
}
}
// //Camera Brigthness
void SldBrightness_ValueChanged(object sender, EventArgs e)
{
if (
acdDevice.LockForConfiguration(out nsError)
)
{
// //Camera Values update
acdDevice.LockExposure(acdDevice.ExposureDuration, sldBrightness.Value, null);
// //Release Resourse
acdDevice.UnlockForConfiguration();
}
}
/*
* Setting up camera setting for EOSpec:
* Focus: 0.3 locked : Empirically chosen for set distance to current version of EOSpec
* ISO : Avg between max and min ISO of device
* Exposure : Empirically set to 1/10
* RGB gain: R and G normalized using max Gain values,
* however Blue is normalized using min Gain value due to it saturating more than green and red channels (my phone: 1.858154 , 1 , 1)
*/
void ConfigureCameraForDevice(AVCaptureDevice device)
{
var error = new NSError();
if (device.IsFocusModeSupported(AVCaptureFocusMode.ContinuousAutoFocus))
{
device.LockForConfiguration(out error);
device.FocusMode = AVCaptureFocusMode.Locked;
device.SetFocusModeLocked((float)0.3, null);
Console.WriteLine("devidce device.FocusMode: " + device.FocusMode);
device.UnlockForConfiguration();
}
if (device.IsExposureModeSupported(AVCaptureExposureMode.ContinuousAutoExposure))
{
device.LockForConfiguration(out error);
device.ExposureMode = AVCaptureExposureMode.Custom;
var iso = (device.ActiveFormat.MaxISO + device.ActiveFormat.MinISO) / 2;
CMTime exposureTime = new CMTime(1, 10);
device.LockExposure(exposureTime, iso, null);
Console.WriteLine("deviceexposure: " + device.ExposureDuration + " = " + exposureTime + " iso: " + iso);
device.UnlockForConfiguration();
//Setting RGB gains using WhiteBalance
device.LockForConfiguration(out error);
AVCaptureWhiteBalanceGains gains = device.DeviceWhiteBalanceGains;
//normalizign Gains
gains.RedGain = Math.Max(1, gains.RedGain);
gains.GreenGain = Math.Max(1, gains.GreenGain);
gains.BlueGain = Math.Min(1, gains.BlueGain);
float maxGain = device.MaxWhiteBalanceGain;
gains.RedGain = Math.Min(maxGain, gains.RedGain);
gains.GreenGain = Math.Min(maxGain, gains.GreenGain);
gains.BlueGain = Math.Min(maxGain, gains.BlueGain);
Console.WriteLine("devidce device.WhiteBalanceMode gains RGB: " + gains.RedGain + " " + gains.GreenGain + " " + gains.BlueGain);
device.SetWhiteBalanceModeLockedWithDeviceWhiteBalanceGains(gains, null);
device.UnlockForConfiguration();
}
}
