IOS OpenGL ES GPUImage 图像 XYDerivative 边缘检测 GPUImageXYDerivativeFilter

IOS OpenGL ES GPUImage  图像 XYDerivative 边缘检测 GPUImageXYDerivativeFilter-猿说编程
IOS OpenGL ES GPUImage 图像 XYDerivative 边缘检测 GPUImageXYDerivativeFilter
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零基础 OpenGL (ES) 学习路线推荐 : OpenGL (ES) 学习目录 >> OpenGL ES 基础

零基础 OpenGL (ES) 学习路线推荐 : OpenGL (ES) 学习目录 >> OpenGL ES 转场

零基础 OpenGL (ES) 学习路线推荐 : OpenGL (ES) 学习目录 >> OpenGL ES 特效

零基础 OpenGL (ES) 学习路线推荐 : OpenGL (ES) 学习目录 >> OpenGL ES 函数

零基础 OpenGL (ES) 学习路线推荐 : OpenGL (ES) 学习目录 >> OpenGL ES GPUImage 使用

零基础 OpenGL (ES) 学习路线推荐 : OpenGL (ES) 学习目录 >> OpenGL ES GLSL 编程


一.简介

GPUImage 共 125 个滤镜, 分为四类

1、Color adjustments : 31 filters , 颜色处理相关
2、Image processing : 40 filters , 图像处理相关.
3、Blending modes : 29 filters , 混合模式相关.
4、Visual effects : 25 filters , 视觉效果相关.

GPUImageXYDerivativeFilter 属于 GPUImage 图像视觉效果相关,用于图像 XYDerivative 边缘检测。shader 源码如下:

/******************************************************************************************/
//@Author:猿说编程
//@Blog(个人博客地址): www.codersrc.com
//@File:IOS – OpenGL ES GPUImage GPUImageXYDerivativeFilter
//@Time:2022/07/02 06:30
//@Motto:不积跬步无以至千里,不积小流无以成江海,程序人生的精彩需要坚持不懈地积累!
/******************************************************************************************/

#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
NSString *const kGPUImageGradientFragmentShaderString = SHADER_STRING
(
 precision highp float;
 
 varying vec2 textureCoordinate;
 varying vec2 leftTextureCoordinate;
 varying vec2 rightTextureCoordinate;
 
 varying vec2 topTextureCoordinate;
 varying vec2 topLeftTextureCoordinate;
 varying vec2 topRightTextureCoordinate;
 
 varying vec2 bottomTextureCoordinate;
 varying vec2 bottomLeftTextureCoordinate;
 varying vec2 bottomRightTextureCoordinate;
 
 uniform sampler2D inputImageTexture;
 
 uniform float edgeStrength;
 
 void main()
 {
     float topIntensity = texture2D(inputImageTexture, topTextureCoordinate).r;
     float topRightIntensity = texture2D(inputImageTexture, topRightTextureCoordinate).r;
     float topLeftIntensity = texture2D(inputImageTexture, topLeftTextureCoordinate).r;
     float bottomIntensity = texture2D(inputImageTexture, bottomTextureCoordinate).r;
     float bottomLeftIntensity = texture2D(inputImageTexture, bottomLeftTextureCoordinate).r;
     float bottomRightIntensity = texture2D(inputImageTexture, bottomRightTextureCoordinate).r;
     float leftIntensity = texture2D(inputImageTexture, leftTextureCoordinate).r;
     float rightIntensity = texture2D(inputImageTexture, rightTextureCoordinate).r;
     
     float verticalDerivative = -topLeftIntensity - topIntensity - topRightIntensity + bottomLeftIntensity + bottomIntensity + bottomRightIntensity;
     float horizontalDerivative = -bottomLeftIntensity - leftIntensity - topLeftIntensity + bottomRightIntensity + rightIntensity + topRightIntensity;
     verticalDerivative = verticalDerivative * edgeStrength;
     horizontalDerivative = horizontalDerivative * edgeStrength;
     
     // Scaling the X * Y operation so that negative numbers are not clipped in the 0..1 range. This will be expanded in the corner detection filter
     gl_FragColor = vec4(horizontalDerivative * horizontalDerivative, verticalDerivative * verticalDerivative, ((verticalDerivative * horizontalDerivative) + 1.0) / 2.0, 1.0);
 }
);
#else
NSString *const kGPUImageGradientFragmentShaderString = SHADER_STRING
(
 varying vec2 textureCoordinate;
 varying vec2 leftTextureCoordinate;
 varying vec2 rightTextureCoordinate;
 
 varying vec2 topTextureCoordinate;
 varying vec2 topLeftTextureCoordinate;
 varying vec2 topRightTextureCoordinate;
 
 varying vec2 bottomTextureCoordinate;
 varying vec2 bottomLeftTextureCoordinate;
 varying vec2 bottomRightTextureCoordinate;
 
 uniform sampler2D inputImageTexture;
 
 uniform float edgeStrength;

 void main()
 {
     float topIntensity = texture2D(inputImageTexture, topTextureCoordinate).r;
     float topRightIntensity = texture2D(inputImageTexture, topRightTextureCoordinate).r;
     float topLeftIntensity = texture2D(inputImageTexture, topLeftTextureCoordinate).r;
     float bottomIntensity = texture2D(inputImageTexture, bottomTextureCoordinate).r;
     float bottomLeftIntensity = texture2D(inputImageTexture, bottomLeftTextureCoordinate).r;
     float bottomRightIntensity = texture2D(inputImageTexture, bottomRightTextureCoordinate).r;
     float leftIntensity = texture2D(inputImageTexture, leftTextureCoordinate).r;
     float rightIntensity = texture2D(inputImageTexture, rightTextureCoordinate).r;
     
     float verticalDerivative = -topLeftIntensity - topIntensity - topRightIntensity + bottomLeftIntensity + bottomIntensity + bottomRightIntensity;
     float horizontalDerivative = -bottomLeftIntensity - leftIntensity - topLeftIntensity + bottomRightIntensity + rightIntensity + topRightIntensity;
     verticalDerivative = verticalDerivative * edgeStrength;
     horizontalDerivative = horizontalDerivative * edgeStrength;
     
     // Scaling the X * Y operation so that negative numbers are not clipped in the 0..1 range. This will be expanded in the corner detection filter
     gl_FragColor = vec4(horizontalDerivative * horizontalDerivative, verticalDerivative * verticalDerivative, ((verticalDerivative * horizontalDerivative) + 1.0) / 2.0, 1.0);
 }
);
#endif

二.效果演示

使用 GPUImageXYDerivativeFilter,原图如下:

图片[1]-IOS OpenGL ES GPUImage  图像 XYDerivative 边缘检测 GPUImageXYDerivativeFilter-猿说编程

使用 GPUImageXYDerivativeFilter 效果如下:

图片[2]-IOS OpenGL ES GPUImage  图像 XYDerivative 边缘检测 GPUImageXYDerivativeFilter-猿说编程

三.源码下载

OpenGL ES Demo 下载地址 : IOS OpenGL ES GPUImage 图像 XYDerivative 边缘检测 GPUImageXYDerivativeFilter


四.猜你喜欢

  1. IOS OPenGL ES 设置图像亮度 GPUImageBrightnessFilter
  2. IOS OPenGL ES 调节图像曝光度 GPUImageExposureFilter
  3. IOS OpenGL ES 调节图像对比度 GPUImageContrastFilter
  4. IOS OPenGL ES 调节图像饱和度 GPUImageSaturationFilter
  5. IOS OPenGL ES 调节图像伽马线 GPUImageGammaFilter
  6. IOS OpenGL ES 调节图像反色 GPUImageColorInvertFilter
  7. IOS OpenGL ES 调节图像褐色 GPUImageSepiaFilter
  8. IOS OpenGL ES 调节图像灰色 GPUImageGrayscaleFilter
  9. IOS OpenGL ES 调节图像RGB通道 GPUImageRGBFilter
  10. IOS OpenGL ES 调节图像不透明度 GPUImageOpacityFilter
  11. IOS OpenGL ES 调节图像阴影 GPUImageHighlightShadowFilter
  12. IOS OpenGL ES 调节图像色彩替换 GPUImageFalseColorFilter
  13. GPUImage – 色彩直方图 GPUImageHistogramFilter
  14. GPUImage – 色彩直方图 GPUImageHistogramGenerator
  15. GPUImage – 像素平均色值 GPUImageAverageColor
  16. GPUImage – 亮度平均 GPUImageLuminosity
  17. IOS OpenGL ES 调节图像色度 GPUImageHueFilter
  18. IOS OpenGL ES 指定颜色抠图 GPUImageChromaKeyFilter
  19. IOS OpenGL ES 调节图像白平衡/色温 GPUImageWhiteBalanceFilter
  20. IOS OpenGL ES 设置图像 lookup 滤镜 GPUImageLookupFilter
  21. IOS OpenGL ES 设置图像滤镜 GPUImageAmatorkaFilter
  22. IOS OpenGL ES 设置图像滤镜 GPUImageSoftEleganceFilter
  23. IOS OpenGL ES 设置图像锐化 GPUImageSharpenFilter
  24. IOS OpenGL ES 绘制十字 GPUImageCrosshairGenerator
  25. IOS OpenGL ES 绘制线条 GPUImageLineGenerator
  26. IOS OpenGL ES 设置图像黑白燥点 GPUImageLocalBinaryPatternFilter
  27. IOS OpenGL ES 设置图像卡通效果(黑色粗线描边) GPUImageToonFilter
  28. IOS OpenGL ES 桑原滤波/水粉画模糊效果 GPUImageKuwaharaFilter
  29. IOS OpenGL ES 黑白马赛克效果 GPUImageMosaicFilter
  30. IOS OpenGL ES 像素化马赛克效果 GPUImagePixellateFilter
  31. IOS OpenGL ES 同心圆像素化马赛克效果 GPUImagePolarPixel
  32. IOS OpenGL ES 黑白网状效果 GPUImageCrosshatchFilter
  33. IOS OpenGL ES 色彩丢失/模糊效果 GPUImageColorPackingFilter
  34. IOS OpenGL ES 图像晕影 GPUImageVignetteFilter
  35. IOS OpenGL ES 图像漩涡 GPUImageSwirlFilter
  36. IOS OpenGL ES 图像鱼眼扩散效果 GPUImageBulgeDistortionFilter
  37. IOS OpenGL ES 图像鱼眼移动效果 GPUImageBulgeDistortionFilter
  38. IOS OpenGL ES 图像凹面镜移动效果 GPUImagePinchDistortionFilter
  39. IOS OpenGL ES 图像凹面镜放大效果 GPUImagePinchDistortionFilter
  40. IOS OpenGL ES 图像哈哈镜效果 GPUImageStretchDistortionFilter
  41. IOS OpenGL ES 图像水晶球效果 GPUImageGlassSphereFilter
  42. IOS OpenGL ES 图像球形折射 GPUImageSphereRefractionFilter
  43. IOS OpenGL ES 图像色调分离噪点效果 GPUImagePosterizeFilter
  44. IOS OpenGL ES 图像CGA色彩滤镜 GPUImageCGAColorspaceFilter
  45. IOS OpenGL ES 图像柏林噪点/花边噪点 GPUImagePerlinNoiseFilter
  46. IOS OpenGL ES 图像加亮边缘 GPUImage3x3ConvolutionFilter
  47. IOS OpenGL ES 图像浮雕3d效果 GPUImageEmbossFilter
  48. IOS OpenGL ES 图像马赛克圆点 GPUImagePolkaDotFilter
  49. IOS OpenGL ES 图像侵蚀边缘黑白模糊 GPUImageErosionFilter
  50. IOS OpenGL ES 图像侵蚀边缘色彩模糊 GPUImageRGBErosionFilter
  51. IOS OpenGL ES 图像扩展边缘黑白模糊 GPUImageDilationFilter
  52. IOS OpenGL ES 图像扩展边缘彩色模糊 GPUImageRGBDilationFilter
  53. IOS OpenGL ES GPUImage 黑白色调模糊 GPUImageOpeningFilter
  54. IOS OpenGL ES GPUImage 彩色模糊 GPUImageRGBOpeningFilter
  55. IOS OpenGL ES GPUImage 图像黑白色调模糊/暗色提亮 GPUImageClosingFilter
  56. IOS OpenGL ES GPUImage 图像彩色调模糊/暗色提亮 GPUImageRGBClosingFilter
  57. IOS OpenGL ES GPUImage 图像Lanczos重取样模糊效果 GPUImageLanczosResamplingFilter
  58. IOS OpenGL ES GPUImage 图像显示亮度最高的像素,其他为黑 GPUImageNonMaximumSuppressionFilter
  59. IOS OpenGL ES GPUImage 图像显示亮度最高的像素,其他为黑 GPUImageThresholdedNonMaximumSuppressionFilter
  60. IOS OpenGL ES GPUImage 图像Sobel边缘检测,类似漫画反色 GPUImageSobelEdgeDetectionFilter
  61. IOS OpenGL ES GPUImage GPUImageWeakPixelInclusionFilter
  62. IOS OpenGL ES GPUImage GPUImageDirectionalNonMaximumSuppressionFilter
  63. IOS OpenGL ES GPUImage 图像阈值边缘检测GPUImageThresholdEdgeDetectionFilter
  64. IOS OpenGL ES GPUImage 图像普瑞维特(Prewitt)边缘检测GPUImagePrewittEdgeDetectionFilter
  65. IOS OpenGL ES GPUImage 图像 XYDerivative 边缘检测 GPUImageXYDerivativeFilter

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