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处理CMSampleBuffer时CIDetector崩溃

vision avfoundation image-processing swift ios

0

Aakash Dave · 技术社区 · 4 年前

我试图通过CIDetector从CMSampleBuffer从avcapturedevideodataoutput获取面部特征。在执行程序时,10次中有9次程序崩溃,只有一次运行正常。

代码:

func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
    
    let imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer)!
    let opaqueBuffer = Unmanaged<CVImageBuffer>.passUnretained(imageBuffer).toOpaque()
    let pixelBuffer = Unmanaged<CVPixelBuffer>.fromOpaque(opaqueBuffer).takeUnretainedValue()
    let sourceImage = CIImage(cvPixelBuffer: pixelBuffer, options: nil)
    let options = [CIDetectorSmile : true as AnyObject, CIDetectorEyeBlink: true as AnyObject, CIDetectorImageOrientation : 6 as AnyObject]
    
    // The detector is nil
    let detector = CIDetector(ofType: CIDetectorTypeFace, context: nil, options: options) 
    let features = detector!.features(in: sourceImage, options: options)

        for feature in features as! [CIFaceFeature] {

            if (feature.hasSmile) {
                printLog(item: "HAPPY")
            }
        }
}

崩溃日志: Unexpectedly found nil while unwrapping an Optional value. 这个 detector 是零

希望得到帮助和进一步的指导。

1 回复 | 直到 4 年前

1

0

Shehata Gamal 4 年前

返回是可选的,并且 sampleBuffer 太重了你只能这样做

if let detector = CIDetector(ofType: CIDetectorTypeFace, context: nil, options: options) {
    let features = detector.features(in: sourceImage, options: options) 
    for feature in features as! [CIFaceFeature] { 
        if (feature.hasSmile) {
            printLog(item: "HAPPY")
        }
    }
}