ios - 来自 CMSampleBuffer 的 UIImage 有蓝色调
<p><p>我在 UIImageView 中显示转换为 UIImages 的 CMSampleBuffers 视频源。在下面的照片中，背景层是 AVCapturePreviewLayer，中心是缓冲区提要。我的目标是去除蓝色。</p>
<p> <a href="/image/ibnma.png" rel="noreferrer noopener nofollow"><img src="/image/ibnma.png" alt="enter image description here"/></a> </p>
<p>这是 CMSampleBuffer 到 UIImage 的代码</p>
<pre><code>extension CMSampleBuffer {
func imageRepresentation() -> UIImage? {
let imageBuffer: CVImageBufferRef = CMSampleBufferGetImageBuffer(self)!
CVPixelBufferLockBaseAddress(imageBuffer, 0)
let address = CVPixelBufferGetBaseAddressOfPlane(imageBuffer, 0)
let bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer)
let width = CVPixelBufferGetWidth(imageBuffer)
let height = CVPixelBufferGetHeight(imageBuffer)
let colorSpace = CGColorSpaceCreateDeviceRGB()
let context = CGBitmapContextCreate(address, width, height, 8, bytesPerRow, colorSpace, CGImageAlphaInfo.NoneSkipFirst.rawValue)
let imageRef = CGBitmapContextCreateImage(context)
CVPixelBufferUnlockBaseAddress(imageBuffer, 0)
let resultImage: UIImage = UIImage(CGImage: imageRef!)
return resultImage
}
}
</code></pre>
<p>AVCaptureVideoDataOutput 设置:</p>
<pre><code>class MovieRecorder: NSObject {
// vars
private let captureVideoDataOutput = AVCaptureVideoDataOutput()
// capture session boilerplate setup...
captureVideoDataOutput.videoSettings =
captureVideoDataOutput.alwaysDiscardsLateVideoFrames = true
captureVideoDataOutput.setSampleBufferDelegate(self, queue: captureDataOutputQueue)
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>问题出在 bitmapInfo 上。这个位图信息修复了它。</p>
<pre><code>let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.NoneSkipFirst.rawValue | CGBitmapInfo.ByteOrder32Little.rawValue)
let context = CGBitmapContextCreate(address, width, height, 8, bytesPerRow, colorSpace, bitmapInfo.rawValue)
</code></pre></p>
<p style="font-size: 20px;">关于ios - 来自 CMSampleBuffer 的 UIImage 有蓝色调，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/33900810/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/33900810/
</a>
</p>
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