一、介绍
GPUImage是Brad Larson在github托管的一个开源项目，项目实现了图片滤镜、摄像头实时滤镜，该项目的优点不但在于滤镜很多，而且处理效果是基于GPU的，比使用CPU性能更高。
二、类库
1.输入源
在Sources文件夹下包含了GPUImageVideoCamera相机视频输入源，GPUImageStillCamera相机图像输入源，GPUImagePicture静态图片输入源，GPUImageMovie视频输入源。
2.通道
GPUImageFilterPipeline将输入源利用滤镜组投射到输出界面上。
3.滤镜
3.1调整颜色的滤镜
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GPUImageBrightnessFilter//亮度 GPUImageExposureFilter//曝光 GPUImageContrastFilter//对比度 GPUImageSaturationFilter//饱和度 GPUImageGammaFilter//伽马线 GPUImageLevelsFilter GPUImageColorMatrixFilter GPUImageRGBFilter GPUImageHueFilter GPUImageToneCurveFilter GPUImageHighlightShadowFilter GPUImageLookupFilter GPUImageAmatorkaFilter GPUImageMissEtikateFilter GPUImageSoftEleganceFilter GPUImageColorInvertFilter GPUImageGrayscaleFilter GPUImageMonochromeFilter GPUImageFalseColorFilter GPUImageHazeFilter GPUImageSepiaFilter GPUImageOpacityFilter GPUImageSolidColorGenerator GPUImageLuminanceThresholdFilter GPUImageAdaptiveThresholdFilter GPUImageAverageLuminanceThresholdFilter GPUImageHistogramFilter GPUImageHistogramGenerator GPUImageAverageColor GPUImageLuminosity GPUImageChromaKeyFilter |
3.2图像处理
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GPUImageTransformFilter//变化 GPUImageCropFilter// GPUImageLanczosResamplingFilter GPUImageSharpenFilter GPUImageUnsharpMaskFilter GPUImageFastBlurFilter GPUImageSingleComponentFastBlurFilter GPUImageGaussianBlurFilter GPUImageSingleComponentGaussianBlurFilter GPUImageGaussianSelectiveBlurFilter GPUImageGaussianBlurPositionFilter GPUImageMedianFilter GPUImageBilateralFilter GPUImageTiltShiftFilter GPUImageBoxBlurFilter GPUImage3x3ConvolutionFilter GPUImageSobelEdgeDetectionFilter GPUImageThresholdEdgeDetectionFilter GPUImageCannyEdgeDetectionFilter GPUImageHarrisCornerDetectionFilter GPUImageNobleCornerDetectionFilter GPUImageShiTomasiCornerDetectionFilter GPUImageNonMaximumSuppressionFilter GPUImageXYDerivativeFilter GPUImageCrosshairGenerator GPUImageDilationFilter GPUImageRGBDilationFilterGPUImageErosionFilter GPUImageRGBErosionFilter GPUImageOpeningFilter GPUImageRGBOpeningFilter GPUImageClosingFilter GPUImageRGBClosingFilter GPUImageLocalBinaryPatternFilter GPUImageLowPassFilter GPUImageHighPassFilter GPUImageMotionDetector GPUImageHoughTransformLineDetector GPUImageLineGenerator GPUImageMotionBlurFilter GPUImageZoomBlurFilter |
3.3混合模式
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GPUImageChromaKeyBlendFilter GPUImageDissolveBlendFilter GPUImageMultiplyBlendFilter GPUImageAddBlendFilter GPUImageSubtractBlendFilter GPUImageDivideBlendFilter GPUImageOverlayBlendFilter GPUImageDarkenBlendFilter GPUImageLightenBlendFilter GPUImageColorBurnBlendFilter GPUImageColorDodgeBlendFilter GPUImageScreenBlendFilter GPUImageExclusionBlendFilter GPUImageDifferenceBlendFilter GPUImageHardLightBlendFilter GPUImageSoftLightBlendFilter GPUImageAlphaBlendFilter GPUImageSourceOverBlendFilter GPUImageColorBurnBlendFilter GPUImageColorDodgeBlendFilter GPUImageNormalBlendFilter GPUImageColorBlendFilter GPUImageHueBlendFilter GPUImageSaturationBlendFilter GPUImageLuminosityBlendFilter GPUImageLinearBurnBlendFilter GPUImagePoissonBlendFilter GPUImageMaskFilter |
3.4视觉效果
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GPUImagePixellateFilter GPUImagePolarPixellateFilter GPUImagePolkaDotFilter GPUImageHalftoneFilter GPUImageCrosshatchFilter GPUImageSketchFilter GPUImageThresholdSketchFilter GPUImageToonFilter GPUImageSmoothToonFilter GPUImageEmbossFilter GPUImagePosterizeFilter GPUImageSwirlFilter GPUImageBulgeDistortionFilter GPUImagePinchDistortionFilter GPUImageStretchDistortionFilter GPUImageSphereRefractionFilter GPUImageGlassSphereFilter GPUImageVignetteFilter GPUImageKuwaharaFilter GPUImageKuwaharaRadius3Filter GPUImagePerlinNoiseFilter GPUImageCGAColorspaceFilter GPUImageMosaicFilter GPUImageJFAVoronoiFilter GPUImageVoronoiConsumerFilter |
3.5.输出
在Outputs文件夹下，GPUImageView常用输出view，GPUImageMovieWriter视频重编码。
三、使用
1.将GPUImage工程拖到需要图像滤镜处理的工程中，导入框架
- CoreMedia
- CoreVideo
- OpenGLES
- AVFoundation
- QuartzCore
2.在使用GPUImage的类中，引入#import “GPUImage.h”
3.创建一个输入源。如：
GPUImagePicture *staticPicture = [[GPUImagePicture alloc] initWithImage:stillImagesmoothlyScaleOutput:YES];
4.创建滤镜。如：
GPUImageFalseColorFilter *filter = [[GPUImageFalseColorFilter alloc] init];
5.创建输出界面。如：
GPUImageView *filteredVideoView = [[GPUImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, viewWidth, viewHeight)];
也可将自己现成的view，作为输出界面，强制类型转换(GPUImageView*)self.view。
6.创建通道。如：
GPUImageFilterPipeline *pipeline = [[GPUImageFilterPipeline alloc]initWithOrderedFilters:arrayTempinput:staticPictureoutput:(GPUImageView*)self.view];
7.图片图像处理
[staticPicture processImage];[videoCamera startCameraCapture];
四、下载