深度數據 - 獲取每像素深度數據（CVPixelBuffer數據分析）

Question

現在我運行AVDepthPhotoFilter，即從iPhone7Plus的立體相機渲染深度參數。

所以，我想訪問每像素深度數據，但是，我不知道該怎麼做。請指教。

Answer 1

如何獲得DepthData和分析CVPixelBuffer數據

1. 你需要確保你的AVCapturePhotoSettings（）已isDepthDataDeliveryEnabled =真

2. 你必須使用的函數FUNC photoOutput（_輸出：AVCapturePhotoOutput，didFinishProcessingPhoto photo：AVCapturePhoto，error：Error？）

   func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) { 
   
       //## Convert Disparity to Depth ## 
   
       let depthData = (photo.depthData as AVDepthData!).converting(toDepthDataType: kCVPixelFormatType_DepthFloat32) 
       let depthDataMap = depthData.depthDataMap //AVDepthData -> CVPixelBuffer 
   
       //## Data Analysis ## 
   
       // Useful data 
       let width = CVPixelBufferGetWidth(depthDataMap) //768 on an iPhone 7+ 
       let height = CVPixelBufferGetHeight(depthDataMap) //576 on an iPhone 7+ 
       CVPixelBufferLockBaseAddress(depthDataMap, CVPixelBufferLockFlags(rawValue: 0)) 
   
       // Convert the base address to a safe pointer of the appropriate type 
       let floatBuffer = unsafeBitCast(CVPixelBufferGetBaseAddress(depthDataMap), to: UnsafeMutablePointer<Float32>.self) 
   
       // Read the data (returns value of type Float) 
       // Accessible values : (width-1) * (height-1) = 767 * 575 
   
       let distanceAtXYPoint = floatBuffer[Int(x * y)] 
   
   } 
   

如果您想了解CVPixelBuffer分析更多的信息，這裏是一個有用的帖子 - >details