Question

我正在使用Swift 3和GPUImage。我有一个名为lut_lookup.png的LUT图像文件我在静止图像上成功地将其用于GPUImage，它应用并使用LUT过滤器显示结果。

我现在正在尝试将相同的LUT滤镜应用于实时摄像机视图，但我似乎无法让它工作。它基本上甚至不显示相机。

我在下面提供了我的代码，非常感谢任何帮助。这可能是我错过/做错的事情，但我似乎无法发现它。

import UIKit
import GPUImage

class LiveCameraVC: UIViewController
{

// MARK: - Variables

let videoCamera: GPUImageVideoCamera? = {
    if let videoCamera = GPUImageVideoCamera(sessionPreset: AVCaptureSessionPreset640x480, cameraPosition: .back) {
        videoCamera.outputImageOrientation = .portrait
        videoCamera.horizontallyMirrorFrontFacingCamera = false
        videoCamera.horizontallyMirrorRearFacingCamera = false
        return videoCamera
    } else {
        print("GPUImageVideoCamera Nil")
        return nil
    }
}()

let filter: GPUImageLookupFilter = {
    let filter = GPUImageLookupFilter()
    filter.intensity = 1.0
    return filter
}()

// MARK: - UI

let modifiedImageView: GPUImageView = {
    let imageView = GPUImageView.newAutoLayout()
    imageView.fillMode = kGPUImageFillModePreserveAspectRatioAndFill;
    imageView.isUserInteractionEnabled = true
    return imageView
}()

// MARK: - Life Cycle

override func viewDidLoad() {
    super.viewDidLoad()

    let tapGesture:UITapGestureRecognizer = UITapGestureRecognizer().bk_init { [unowned self] (sender:UIGestureRecognizer?, state:UIGestureRecognizerState, location:CGPoint) in

        print("Tapped")
        self.performLut()

        } as! UITapGestureRecognizer
    modifiedImageView.addGestureRecognizer(tapGesture)
}

override func loadView() {
    super.loadView()

    self.view.addSubview(modifiedImageView)
    modifiedImageView.autoPinEdgesToSuperviewEdges()
}

// MARK: - Private

private func performLut() {
    print("performLut")
    if let videoCamera = videoCamera {
        if let lookupImageSource = GPUImagePicture(image: UIImage(named:"lut_lookup")) {
            videoCamera.addTarget(filter, atTextureLocation: 0)
            lookupImageSource.addTarget(filter, atTextureLocation: 1)
            filter.addTarget(modifiedImageView)
            videoCamera.startCapture()
        } else {
            print("videoCamera Nil")
        }
    } else {
        print("GPUImageVideoCamera Nil")
    }
}
}

由于

Answer 1

解决了它。我将代码更改为：

let imagePicture: GPUImagePicture? = {
    if let imagePicture = GPUImagePicture(image: UIImage(named:"lut_lookup")) {
        return imagePicture
    } else {
        print("GPUImagePicture Nil")
        return nil
    }
}()


private func performLut() {
    if let videoCamera = videoCamera {
        if let imagePicture = imagePicture {
            videoCamera.addTarget(filter)
            imagePicture.addTarget(filter)
            imagePicture.processImage()
            filter.addTarget(modifiedImageView)
            videoCamera.startCapture()
        }
    }
}

希望能帮助别人！

使用GPUImagePicture的自定义LUT的GPUImageVideoCamera实时预览

1 个答案: