[英]How to convert a UIImage to a CVPixelBuffer 32BGRA for mediapipe?
我正在使用 mediapipe 開發 iOS 應用程序,現在我需要向 mediapipe 輸入圖像數據,但 mediapipe 只接受 32BGRA CVPixelBuffer。
如何將 UIImage 轉換為 32BGRA CVPixelBuffer?
我正在使用這段代碼:
let frameSize = CGSize(width: self.cgImage!.width, height: self.cgImage!.height)
var pixelBuffer:CVPixelBuffer? = nil
let status = CVPixelBufferCreate(kCFAllocatorDefault, Int(frameSize.width), Int(frameSize.height), kCVPixelFormatType_32BGRA , nil, &pixelBuffer)
if status != kCVReturnSuccess {
return nil
}
CVPixelBufferLockBaseAddress(pixelBuffer!, CVPixelBufferLockFlags.init(rawValue: 0))
let data = CVPixelBufferGetBaseAddress(pixelBuffer!)
let rgbColorSpace = CGColorSpaceCreateDeviceRGB()
let bitmapInfo = CGBitmapInfo(rawValue: CGBitmapInfo.byteOrder32Little.rawValue | CGImageAlphaInfo.premultipliedFirst.rawValue)
let context = CGContext(data: data, width: Int(frameSize.width), height: Int(frameSize.height), bitsPerComponent: 8, bytesPerRow: CVPixelBufferGetBytesPerRow(pixelBuffer!), space: rgbColorSpace, bitmapInfo: bitmapInfo.rawValue)
context?.draw(self.cgImage!, in: CGRect(x: 0, y: 0, width: self.cgImage!.width, height: self.cgImage!.height))
CVPixelBufferUnlockBaseAddress(pixelBuffer!, CVPixelBufferLockFlags(rawValue: 0))
return pixelBuffer
但我會在 mediapipe mediapipe/0 (11): signal SIGABRT
上拋出一個錯誤
如果我使用AVCaptureVideoDataOutput
一切都很好。
順便說一句:我正在使用 swift。
也許你可以試試這個。 我還有一個問題要問你,你知道如何在 mediapipe 中使用靜態圖像進行人臉識別嗎? 如果你知道,請告訴我,謝謝
func pixelBufferFromCGImage(image:CGImage) -> CVPixelBuffer? {
let options = [
kCVPixelBufferCGImageCompatibilityKey as String: NSNumber(value: true),
kCVPixelBufferCGBitmapContextCompatibilityKey as String: NSNumber(value: true),
kCVPixelBufferIOSurfacePropertiesKey as String: [:]
] as CFDictionary
let size:CGSize = .init(width: image.width, height: image.height)
var pxbuffer: CVPixelBuffer? = nil
let status = CVPixelBufferCreate(
kCFAllocatorDefault,
Int(size.width),
Int(size.height),
kCVPixelFormatType_32BGRA,
options,
&pxbuffer)
guard let pxbuffer = pxbuffer else { return nil }
CVPixelBufferLockBaseAddress(pxbuffer, [])
guard let pxdata = CVPixelBufferGetBaseAddress(pxbuffer) else {return nil}
let bitmapInfo = CGBitmapInfo(rawValue: CGBitmapInfo.byteOrder32Little.rawValue | CGImageAlphaInfo.premultipliedFirst.rawValue)
guard let context = CGContext(data: pxdata, width: Int(size.width), height: Int(size.height), bitsPerComponent: 8, bytesPerRow: CVPixelBufferGetBytesPerRow(pxbuffer), space: CGColorSpaceCreateDeviceRGB(), bitmapInfo:bitmapInfo.rawValue) else {
return nil
}
context.concatenate(CGAffineTransformIdentity)
context.draw(image, in: .init(x: 0, y: 0, width: size.width, height: size.height))
///error: CGContextRelease' is unavailable: Core Foundation objects are automatically memory managed
///maybe CGContextRelease should not use it
CGContextRelease(context)
CVPixelBufferUnlockBaseAddress(pxbuffer, [])
return pxbuffer
}
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