Android CameraX 获取当前的展览、焦点等

Posted 2023-04-17

【中文标题】Android CameraX 获取当前的展览、焦点等

【英文标题】：Android CameraX get current exposition, focus, etc

【发布时间】：2021-06-26 12:58:16

【问题描述】：

我想禁用所有自动，这样我可以从相机获得稳定的信号

我尝试在相机启动后 5 秒内锁定 AE、AWB、黑阶颜色

.setCaptureRequestOption(CaptureRequest.CONTROL_AE_LOCK, true)     
.setCaptureRequestOption(CaptureRequest.BLACK_LEVEL_LOCK, true)                                            
.setCaptureRequestOption(CaptureRequest.CONTROL_AWB_LOCK, true)

它适用于 Pixel 4a，但不适用于启用了闪光灯的 Galaxy S7 - Galaxy S7 不会锁定 AE（禁用闪光灯时它可以工作）。我试过设置

setCaptureRequestOption(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_OFF)

它适用于 S7，但不适用于 Pixel 4a。像素将曝光设置为最低，我看到几乎黑屏。

setCaptureRequestOption(CaptureRequest.CONTROL_MODE, CaptureRequest.CONTROL_MODE_OFF_KEEP_STATE)

作用相同

现在我想尝试设置 CONTROL_MODE_OFF_KEEP_STATE 并设置当前的博览会，所以它会被手动锁定。但我找不到获取当前博览会的方法，我只能获取 SENSOR_INFO_EXPOSURE_TIME_RANGE

所以，我的问题是

是否可以在运行时获取当前的曝光、焦点、灵敏度等？

【参考方案1】：

解决办法是Camera2Interop.setSessionCaptureCallback onCaptureCompleted 中的参数result: TotalCaptureResult 包含所有需要的数据

val builder = ImageAnalysis.Builder();
val camera2InterOp = Camera2Interop.Extender(builder)
camera2InterOp.setSessionCaptureCallback(object : CameraCaptureSession.CaptureCallback() 
                override fun onCaptureCompleted(session: CameraCaptureSession, request: CaptureRequest, result: TotalCaptureResult) 
                    super.onCaptureCompleted(session, request, result)
                    if (!delayedParamsApplied && System.currentTimeMillis() - startTime > 5000) 
                        delayedParamsApplied = true
                        try 
                            val bundleBuilder =
                                    CaptureRequestOptions.Builder()
                                            .setCaptureRequestOption(CaptureRequest.CONTROL_AE_LOCK, true)
                                            .setCaptureRequestOption(CaptureRequest.BLACK_LEVEL_LOCK, true)
                                            .setCaptureRequestOption(CaptureRequest.CONTROL_AWB_LOCK, true)

                            getFocusDistance()?.let 
                                bundleBuilder.setCaptureRequestOption(CaptureRequest.LENS_FOCUS_DISTANCE, it)
                            
                            result.get(CaptureResult.SENSOR_EXPOSURE_TIME)?.let 
                                bundleBuilder.setCaptureRequestOption(CaptureRequest.SENSOR_EXPOSURE_TIME, it)
                            
                            result.get(CaptureResult.SENSOR_SENSITIVITY)?.let 
                                bundleBuilder.setCaptureRequestOption(CaptureRequest.SENSOR_SENSITIVITY, it)
                            
                            result.get(CaptureResult.SENSOR_FRAME_DURATION)?.let 
                                bundleBuilder.setCaptureRequestOption(CaptureRequest.SENSOR_FRAME_DURATION, it)
                            


                            bundleBuilder.setCaptureRequestOption(CaptureRequest.CONTROL_MODE, CaptureRequest.CONTROL_MODE_OFF_KEEP_STATE)
                            bundleBuilder.setCaptureRequestOption(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_OFF)
                            val bundle = bundleBuilder.build()
                            cameraControl.captureRequestOptions = bundle
                         catch (t: Throwable) 
                            Timber.e(t)
                        
                    
                
            )

【讨论】：

您使用的是哪个版本？我正在尝试用 java 做，但遇到ExtenderBuilder

的问题

@Balasubramanian 1.1.0-alpha07