过滤图片快速变化的图像尺寸

Question

我有一个像相机这样的应用程序来捕获照片并对其应用滤镜。一切正常，唯一的问题是当我将滤镜应用于图像时，它会更改尺寸。我也调整了图像的大小，但是直到无法获得像原始图像一样的图像。我的代码是

    let ciContext = CIContext(options: nil)
    let coreimg = CIImage(image: AppDelegate.captured_iamge!)
    let filter = CIFilter(name: CIFilterNames[indexPath.row])
    filter!.setDefaults()
    filter!.setValue(coreimg, forKey: kCIInputImageKey)
    let filtered_img_data = filter!.value(forKey: kCIOutputImageKey) as! CIImage
    let filtered_img_ref = ciContext.createCGImage(filtered_img_data, from: filtered_img_data.extent)
    let img = UIImage(cgImage: filtered_img_ref!)
    print("Filtered Image size is \(img.size)")


    let size = img_view.image?.size
    print("ImageView on which image is displaying size \(size!)")


    let newimg =  resizeImage(image: img, targetSize: size!)

    print("Resized Image size \(newimg.size)")


    img_view.image = newimg

调整图像大小的方法

func resizeImage (image: UIImage, targetSize: CGSize) -> UIImage {
    let newSize : CGSize = targetSize let rect = CGRect (x: 0, y: 0, width: newSize.width, height: newSize.height)
    UIGraphicsBeginImageContextWithOptions (newSize, false, 1.0)
    image.draw (in: rect)
    let newImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return newImage!
}

捕获图像就像

当我运行放出的代码时，就像

但是当我显示图像时还是这样

解决此问题的任何建议