如何有效地应用GPUImage滤镜? [英] How To Apply GPUImage filters efficiently?
问题描述
在我的项目中,我为图像添加颜色,然后过一秒钟,我对其应用了Kuwahara滤镜,以获得水彩效果,但问题是应用滤镜会花费一些时间,如果我过多地改变了颜色,应用最终由于内存问题而崩溃.谁能帮助我如何以最佳方式使用过滤器.谢谢
In my project, I apply colors to an image then after a second I am applying a Kuwahara filter to it, for watercolor effect, but the thing is it takes time to apply the filter and if I change the colors too much the app eventually crashes due to memory issues. Can anyone help me how to use the filter in the best manner. Thanks
CODE
@objc func fillColorButtonTapped(_ sender : UIButton){
self.processingModel.isImageMixedColor = false
if let popoverController = self.mkColorPicker.popoverPresentationController{
popoverController.delegate = self.mkColorPicker
popoverController.permittedArrowDirections = .any
popoverController.sourceView = sender
popoverController.sourceRect = sender.bounds
}
self.present(self.mkColorPicker, animated: true, completion: nil)
self.mkColorPicker.selectedColor = { [weak self] color in
guard let strongSelf = self else {
return
}
let image = ChangeColor.image(byReplacingColor: strongSelf.processingModel.pencileDefaultImage, withSourceColor: .black, withMinTolerance: 0.4, withMaxTolerance: 0.5, with: color)
strongSelf.processingModel.croppedImageToWorkOn = image
UIView.transition(with: strongSelf.handAndFootImageView,
duration: 0.2,
options: .transitionCrossDissolve,
animations: {strongSelf.handAndFootImageView.image = strongSelf.processingModel.croppedImageToWorkOn},
completion: nil)
strongSelf.addWaterColorEffect()
}
}
func addWaterColorEffect(withRadius : Int = 5){
CommonClass.delayWithSeconds(0.5, completion: {
let filter = KuwaharaFilter()
filter.radius = withRadius
let imageToFilter = self.containerView.toImage()
DispatchQueue.main.async {
let imageToShow = imageToFilter.filterWithOperation(filter)
UIView.transition(with: self.handAndFootImageView,
duration: 0.6,
options: .transitionCrossDissolve,
animations: {self.handAndFootImageView.image = imageToShow },
completion: nil)
self.processingModel.croppedImageToWorkOn = imageToShow
}
})
}
推荐答案
这就是我根据自己的想法,使用GPUImage2快速设置过滤器的方法.图像进入彩色滤光片,然后进入溶解混合物(混合物0.0)的源1.然后将颜色滤镜发送到kuwahara滤镜中,然后发送到溶解混合液的来源2中.从那里,您可以在两者之间切换,并随心所欲地更改半径.
This is how I would simply setup the filters using GPUImage2 in swift based upon what I think you are after. Image into color filter, then into source 1 of dissolve blend (mix 0.0). Then send the color filter into the kuwahara filter and then into source 2 of the dissolve blend. From there you can just transition between the two and change the radius however much you want.
func setupFilters() {
image --> colorFilter --> dissolveBlend
colorFilter --> kuwaharaFilter --> dissolveBlend --> renderView
dissolveBlend.mix = 0.0
}
func addWaterColorEffect(withRadius : Int = 5){
kuwaharaFilter.radius = withRadius
dissolveBlend.mix = 1.0
// This will not give you a transition but you can use a while loop or timer
// to change the mix over the course of whatever length of time you are seeking.
}
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