本文实例为大家分享了Android Camera2开启自动曝光功能的具体代码,供大家参考,具体内容如下 首先,打开3A的总开关: CaptureRequest.Builder bui
本文实例为大家分享了Android Camera2开启自动曝光功能的具体代码,供大家参考,具体内容如下
首先,打开3A的总开关:
CaptureRequest.Builder builder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
获取支持的 AE FPS Range:
List<int[]> ae_fps_ranges = new ArrayList<>();
for (Range<Integer> r : characteristics.get(CameraCharacteristics.CONTROL_AE_AVaiLABLE_TARGET_FPS_RANGES)) {
ae_fps_ranges.add(new int[] {r.getLower(), r.getUpper()});
}
Collections.sort(ae_fps_ranges, new CameraController.RangeSorter());
然后,设置FPS:
builder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, ae_target_fps_range);
最后,根据 Flash_Mode 设置 AE_MODE
switch(flash_value) {
case "flash_off":
builder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON);
builder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_OFF);
break;
case "flash_auto":
// note we set this even in fake flash mode (where we manually turn torch on and off to simulate flash) so we
// can read the FLASH_REQUIRED state to determine if flash is required
builder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON_AUTO_FLASH);
//这里FLASH_MODE可以设置为任意值,因为AE_MODE优先级高
builder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_OFF);
break;
case "flash_on":
// see note above for "flash_auto" for why we set this even fake flash mode - arguably we don't need to know
// about FLASH_REQUIRED in flash_on mode, but we set it for consistency...
builder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON_ALWAYS_FLASH);
builder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_OFF);
break;
case "flash_torch":
builder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON);
builder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_TORCH);
break;
case "flash_red_eye":
// not supported for expo bracketing or burst
if( CameraController2.this.burst_type != BurstType.BURSTTYPE_NONE )
builder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON);
else
builder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON_AUTO_FLASH_REDEYE);
builder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_OFF);
break;
case "flash_frontscreen_auto":
case "flash_frontscreen_on":
case "flash_frontscreen_torch":
builder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON);
builder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_OFF);
break;
}
查看每帧的曝光参数:
CameraCaptureSession.CaptureCallback{
@Override
public void onCaptureCompleted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull TotalCaptureResult result) {
long capture_result_exposure_time = result.get(CaptureResult.SENSOR_EXPOSURE_TIME);
long capture_result_sensitivity = result.get(CaptureResult.SENSOR_SENSITIVITY);
}
}
--结束END--
本文标题: Android Camera2开启自动曝光功能
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