GPUImage简单说明

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GPUImageLevelsFilterGPUImageColorMatrixFilterGPUImageRGBFilterGPUImageHueFilterGPUImageToneCurveFilterGPUImageHighlightShadowFilterGPUImageLookupFilterGPUImageAmatorkaFilterGPUImageMissEtikateFilterGPUImageSoftEleganceFilterGPUImageColorInvertFilterGPUImageGrayscaleFilterGPUImageMonochromeFilterGPUImageFalseColorFilterGPUImageHazeFilterGPUImageSepiaFilterGPUImageOpacityFilterGPUImageSolidColorGeneratorGPUImageLuminanceThresholdFilterGPUImageAdaptiveThresholdFilterGPUImageAverageLuminanceThresholdFilterGPUImageHistogramFilterGPUImageHistogramGeneratorGPUImageAverageColorGPUImageLuminosityGPUImageChromaKeyFilter

3.2图像处理

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GPUImageTransformFilter//变化GPUImageCropFilter//GPUImageLanczosResamplingFilterGPUImageSharpenFilterGPUImageUnsharpMaskFilterGPUImageFastBlurFilterGPUImageSingleComponentFastBlurFilterGPUImageGaussianBlurFilterGPUImageSingleComponentGaussianBlurFilterGPUImageGaussianSelectiveBlurFilterGPUImageGaussianBlurPositionFilterGPUImageMedianFilterGPUImageBilateralFilterGPUImageTiltShiftFilterGPUImageBoxBlurFilterGPUImage3x3ConvolutionFilterGPUImageSobelEdgeDetectionFilterGPUImageThresholdEdgeDetectionFilterGPUImageCannyEdgeDetectionFilterGPUImageHarrisCornerDetectionFilterGPUImageNobleCornerDetectionFilterGPUImageShiTomasiCornerDetectionFilterGPUImageNonMaximumSuppressionFilterGPUImageXYDerivativeFilterGPUImageCrosshairGeneratorGPUImageDilationFilterGPUImageRGBDilationFilterGPUImageErosionFilterGPUImageRGBErosionFilterGPUImageOpeningFilterGPUImageRGBOpeningFilterGPUImageClosingFilterGPUImageRGBClosingFilterGPUImageLocalBinaryPatternFilterGPUImageLowPassFilterGPUImageHighPassFilterGPUImageMotionDetectorGPUImageHoughTransformLineDetectorGPUImageLineGeneratorGPUImageMotionBlurFilterGPUImageZoomBlurFilter

3.3混合模式

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GPUImageChromaKeyBlendFilterGPUImageDissolveBlendFilterGPUImageMultiplyBlendFilterGPUImageAddBlendFilterGPUImageSubtractBlendFilterGPUImageDivideBlendFilterGPUImageOverlayBlendFilterGPUImageDarkenBlendFilterGPUImageLightenBlendFilterGPUImageColorBurnBlendFilterGPUImageColorDodgeBlendFilterGPUImageScreenBlendFilterGPUImageExclusionBlendFilterGPUImageDifferenceBlendFilterGPUImageHardLightBlendFilterGPUImageSoftLightBlendFilterGPUImageAlphaBlendFilterGPUImageSourceOverBlendFilterGPUImageColorBurnBlendFilterGPUImageColorDodgeBlendFilterGPUImageNormalBlendFilterGPUImageColorBlendFilterGPUImageHueBlendFilterGPUImageSaturationBlendFilterGPUImageLuminosityBlendFilterGPUImageLinearBurnBlendFilterGPUImagePoissonBlendFilterGPUImageMaskFilter

3.4视觉效果

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GPUImagePixellateFilterGPUImagePolarPixellateFilterGPUImagePolkaDotFilterGPUImageHalftoneFilterGPUImageCrosshatchFilterGPUImageSketchFilterGPUImageThresholdSketchFilterGPUImageToonFilterGPUImageSmoothToonFilterGPUImageEmbossFilterGPUImagePosterizeFilterGPUImageSwirlFilterGPUImageBulgeDistortionFilterGPUImagePinchDistortionFilterGPUImageStretchDistortionFilterGPUImageSphereRefractionFilterGPUImageGlassSphereFilterGPUImageVignetteFilterGPUImageKuwaharaFilterGPUImageKuwaharaRadius3FilterGPUImagePerlinNoiseFilterGPUImageCGAColorspaceFilterGPUImageMosaicFilterGPUImageJFAVoronoiFilterGPUImageVoronoiConsumerFilter

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：

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GPUImagePicture *staticPicture = [[GPUImagePicture alloc] initWithImage:stillImagesmoothlyScaleOutput:YES];

4.创建滤镜。如：

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GPUImageFalseColorFilter *filter = [[GPUImageFalseColorFilter alloc] init];

5.创建输出界面。如：

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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：

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GPUImageFilterPipeline *pipeline = [[GPUImageFilterPipeline alloc]initWithOrderedFilters:arrayTempinput:staticPictureoutput:(GPUImageView*)self.view];

7.图片图像处理

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[staticPicture processImage];[videoCamera startCameraCapture];

四、下载

github下载

注：后面会把每个滤镜的基本功能注释码上