Android Camera2開啟自動曝光功能
本文實例為大傢分享瞭Android Camera2開啟自動曝光功能的具體代碼,供大傢參考,具體內容如下
首先,打開3A的總開關:
CaptureRequest.Builder builder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
獲取支持的 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());
然後,設置FPS:
builder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, ae_target_fps_range);
最後,根據 Flash_Mode 設置 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 /*if( use_fake_precapture || CameraController2.this.want_expo_bracketing ) 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); //這裡FLASH_MODE可以設置為任意值,因為AE_MODE優先級高 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... /*if( use_fake_precapture || CameraController2.this.want_expo_bracketing ) builder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON); else*/ 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; }
查看每幀的曝光參數:
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); } }
以上就是本文的全部內容,希望對大傢的學習有所幫助,也希望大傢多多支持WalkonNet。