core-image

I need to make an application in iphone which needs to calculate noise, geometric deformation other distortions in an image. How to do this? I have done some image processing stuff with opencv + iphone. But I dont know how to calculate these parameters. 1) How to calculate noise in an image? 2) What is geometric deformation and how to calculate geometric deformation of an image? 3) Is geometric deformation and distortion are same parameters in terms of image filter? or any other distortions available to calculate an image is good quality or not? Input: My image is a face image in live video

I use Metal and CADisplayLink to live filter a CIImage and render it into a MTKView . // Starting display link displayLink = CADisplayLink(target: self, selector: #selector(applyAnimatedFilter)) displayLink.preferredFramesPerSecond = 30 displayLink.add(to: .current, forMode: .default) @objc func applyAnimatedFilter() { ... metalView.image = filter.applyFilter(image: ciImage) } According to the memory monitor in Xcode, memory usage is stable on iPhone X and never goes above 100mb, on devices like iPhone 6 or iPhone 6s the memory usage keeps growing until eventually the system kills the app. I

I am trying to process image using Core Image. I have created UIImage category to do it. I have added QuartzCore and CoreImage frameworks to project, imported CoreImage/CoreImage.h and used this code: CIImage *inputImage = self.CIImage; CIFilter *exposureAdjustmentFilter = [CIFilter filterWithName:@"CIExposureAdjust"]; [exposureAdjustmentFilter setDefaults]; [exposureAdjustmentFilter setValue:inputImage forKey:@"inputImage"]; [exposureAdjustmentFilter setValue:[NSNumber numberWithFloat:5.0f] forKey:@"inputEV"]; CIImage *outputImage = [exposureAdjustmentFilter valueForKey:@"outputImage"];

I am trying to convert a pixelBuffer extracted from AVPlayerItemVideoOutput to CIImage but always getting nil. The Code if([videoOutput_ hasNewPixelBufferForItemTime:player_.internalPlayer.currentItem.currentTime]) { CVPixelBufferRef pixelBuffer = [videoOutput_ copyPixelBufferForItemTime:player_.internalPlayer.currentItem.currentTime itemTimeForDisplay:nil]; CIImage *image = [CIImage imageWithCVPixelBuffer:pixelBuffer]; // Always image === nil CIFilter *filter = [FilterCollection filterSepiaForImage:image]; image = filter.outputImage; CIContext *context = [CIContext contextWithOptions:nil];

Is there any sample code or example for CITemperatureAndTint? I have read its documentation but i need some example to implement it. Bala CIFilter *yourFilter = [CIFilter filterWithName:@"CITemperatureAndTint"]; [yourFilter setValue:yourInputImage forKey:@"inputImage"]; [yourFilter setValue:[CIVector vectorWithX:6500 Y:500] forKey:@"inputNeutral"]; // Default value: [6500, 0] Identity: [6500, 0] [yourFilter setValue:[CIVector vectorWithX:1000 Y:630] forKey:@"inputTargetNeutral"]; // Default value: [6500, 0] Identity: [6500, 0] CIImage *resultImage = [yourFilter valueForKey: @"outputImage"];

Thanks for looking. Here's my code CIImage *result = _vignette.outputImage; self.mainImageView.image = nil; //self.mainImageView.contentMode = UIViewContentModeScaleAspectFit; self.mainImageView.image = [UIImage imageWithCIImage:result]; self.mainImageView.contentMode = UIViewContentModeScaleAspectFit; in here _vignette is correctly set up filter and image effect is applying to the image correctly. I'm using a source image with resolution 500x375. My imageView has almost iPhone screen's resolution. So to avoid stretching I'm using AspectFit. But after applying effect when I'm assigning the

I am new to swift and trying to build a camera app which can apply real-time filters, and save with the applied filters. So far i can preview real-time with the applied filters, but when i save the video its all black. import UIKit import AVFoundation import AssetsLibrary import CoreMedia import Photos class ViewController: UIViewController , AVCaptureVideoDataOutputSampleBufferDelegate { var captureSession: AVCaptureSession! @IBOutlet weak var previewView: UIView! @IBOutlet weak var recordButtton: UIButton! @IBOutlet weak var imageView: UIImageView! var assetWriter: AVAssetWriter? var