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- 一.简介
- 二.效果演示
- 三.源码下载
- 四.猜你喜欢
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.
GPUImageThresholdEdgeDetectionFilter 属于 GPUImage 图像视觉效果相关,用于图像阈值边缘检测。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 GPUImageThresholdEdgeDetectionFilter
//@Time:2022/06/26 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!
/******************************************************************************************/
// Invert the colorspace for a sketch
#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
NSString *const kGPUImageThresholdEdgeDetectionFragmentShaderString = 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 lowp float threshold;
uniform float edgeStrength;
void main()
{
// float bottomLeftIntensity = texture2D(inputImageTexture, bottomLeftTextureCoordinate).r;
// float topRightIntensity = texture2D(inputImageTexture, topRightTextureCoordinate).r;
// float topLeftIntensity = texture2D(inputImageTexture, topLeftTextureCoordinate).r;
// float bottomRightIntensity = texture2D(inputImageTexture, bottomRightTextureCoordinate).r;
float leftIntensity = texture2D(inputImageTexture, leftTextureCoordinate).r;
float rightIntensity = texture2D(inputImageTexture, rightTextureCoordinate).r;
float bottomIntensity = texture2D(inputImageTexture, bottomTextureCoordinate).r;
float topIntensity = texture2D(inputImageTexture, topTextureCoordinate).r;
float centerIntensity = texture2D(inputImageTexture, textureCoordinate).r;
// float h = -topLeftIntensity - 2.0 * topIntensity - topRightIntensity + bottomLeftIntensity + 2.0 * bottomIntensity + bottomRightIntensity;
// float v = -bottomLeftIntensity - 2.0 * leftIntensity - topLeftIntensity + bottomRightIntensity + 2.0 * rightIntensity + topRightIntensity;
// float h = -topLeftIntensity - 2.0 * topIntensity - topRightIntensity + leftIntensity + 2.0 * centerIntensity + rightIntensity;
// float v = -bottomLeftIntensity - 2.0 * leftIntensity - topLeftIntensity + bottomIntensity + 2.0 * centerIntensity + topIntensity;
float h = (centerIntensity - topIntensity) + (bottomIntensity - centerIntensity);
float v = (centerIntensity - leftIntensity) + (rightIntensity - centerIntensity);
// float h = (centerIntensity - topIntensity);
// float j = (topIntensity - centerIntensity);
// h = max(h,j);
// j = abs(h);
// float v = (centerIntensity - leftIntensity);
float mag = length(vec2(h, v)) * edgeStrength;
mag = step(threshold, mag);
// float mag = abs(h);
// gl_FragColor = vec4(h, h, h, 1.0);
// gl_FragColor = vec4(texture2D(inputImageTexture, textureCoordinate));
// gl_FragColor = vec4(h, centerIntensity, j, 1.0);
gl_FragColor = vec4(mag, mag, mag, 1.0);
}
);
#else
NSString *const kGPUImageThresholdEdgeDetectionFragmentShaderString = 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 threshold;
uniform float edgeStrength;
void main()
{
float bottomLeftIntensity = texture2D(inputImageTexture, bottomLeftTextureCoordinate).r;
float topRightIntensity = texture2D(inputImageTexture, topRightTextureCoordinate).r;
float topLeftIntensity = texture2D(inputImageTexture, topLeftTextureCoordinate).r;
float bottomRightIntensity = texture2D(inputImageTexture, bottomRightTextureCoordinate).r;
float leftIntensity = texture2D(inputImageTexture, leftTextureCoordinate).r;
float rightIntensity = texture2D(inputImageTexture, rightTextureCoordinate).r;
float bottomIntensity = texture2D(inputImageTexture, bottomTextureCoordinate).r;
float topIntensity = texture2D(inputImageTexture, topTextureCoordinate).r;
float h = -topLeftIntensity - 2.0 * topIntensity - topRightIntensity + bottomLeftIntensity + 2.0 * bottomIntensity + bottomRightIntensity;
h = max(0.0, h);
float v = -bottomLeftIntensity - 2.0 * leftIntensity - topLeftIntensity + bottomRightIntensity + 2.0 * rightIntensity + topRightIntensity;
v = max(0.0, v);
float mag = length(vec2(h, v)) * edgeStrength;
mag = step(threshold, mag);
gl_FragColor = vec4(vec3(mag), 1.0);
}
);
#endif
二.效果演示
使用 GPUImageThresholdEdgeDetectionFilter **,**原图如下:
使用 GPUImageThresholdEdgeDetectionFilter 效果如下:
三.源码下载
OpenGL ES Demo 下载地址 : IOS OpenGL ES GPUImage 图像阈值边缘检测 GPUImageThresholdEdgeDetectionFilter
四.猜你喜欢
- IOS OPenGL ES 设置图像亮度 GPUImageBrightnessFilter
- IOS OPenGL ES 调节图像曝光度 GPUImageExposureFilter
- IOS OpenGL ES 调节图像对比度 GPUImageContrastFilter
- IOS OPenGL ES 调节图像饱和度 GPUImageSaturationFilter
- IOS OPenGL ES 调节图像伽马线 GPUImageGammaFilter
- IOS OpenGL ES 调节图像反色 GPUImageColorInvertFilter
- IOS OpenGL ES 调节图像褐色 GPUImageSepiaFilter
- IOS OpenGL ES 调节图像灰色 GPUImageGrayscaleFilter
- IOS OpenGL ES 调节图像 RGB 通道 GPUImageRGBFilter
- IOS OpenGL ES 调节图像不透明度 GPUImageOpacityFilter
- IOS OpenGL ES 调节图像阴影 GPUImageHighlightShadowFilter
- IOS OpenGL ES 调节图像色彩替换 GPUImageFalseColorFilter
- GPUImage – 色彩直方图 GPUImageHistogramFilter
- GPUImage – 色彩直方图 GPUImageHistogramGenerator
- GPUImage – 像素平均色值 GPUImageAverageColor
- GPUImage – 亮度平均 GPUImageLuminosity
- IOS OpenGL ES 调节图像色度 GPUImageHueFilter
- IOS OpenGL ES 指定颜色抠图 GPUImageChromaKeyFilter
- IOS OpenGL ES 调节图像白平衡/色温 GPUImageWhiteBalanceFilter
- IOS OpenGL ES 设置图像 lookup 滤镜 GPUImageLookupFilter
- IOS OpenGL ES 设置图像滤镜 GPUImageAmatorkaFilter
- IOS OpenGL ES 设置图像滤镜 GPUImageSoftEleganceFilter
- IOS OpenGL ES 设置图像锐化 GPUImageSharpenFilter
- IOS OpenGL ES 绘制十字 GPUImageCrosshairGenerator
- IOS OpenGL ES 绘制线条 GPUImageLineGenerator
- IOS OpenGL ES 设置图像黑白燥点 GPUImageLocalBinaryPatternFilter
- IOS OpenGL ES 设置图像卡通效果(黑色粗线描边) GPUImageToonFilter
- IOS OpenGL ES 桑原滤波/水粉画模糊效果 GPUImageKuwaharaFilter
- IOS OpenGL ES 黑白马赛克效果 GPUImageMosaicFilter
- IOS OpenGL ES 像素化马赛克效果 GPUImagePixellateFilter
- IOS OpenGL ES 同心圆像素化马赛克效果 GPUImagePolarPixel
- IOS OpenGL ES 黑白网状效果 GPUImageCrosshatchFilter
- IOS OpenGL ES 色彩丢失/模糊效果 GPUImageColorPackingFilter
- IOS OpenGL ES 图像晕影 GPUImageVignetteFilter
- IOS OpenGL ES 图像漩涡 GPUImageSwirlFilter
- IOS OpenGL ES 图像鱼眼扩散效果 GPUImageBulgeDistortionFilter
- IOS OpenGL ES 图像鱼眼移动效果 GPUImageBulgeDistortionFilter
- IOS OpenGL ES 图像凹面镜移动效果 GPUImagePinchDistortionFilter
- IOS OpenGL ES 图像凹面镜放大效果 GPUImagePinchDistortionFilter
- IOS OpenGL ES 图像哈哈镜效果 GPUImageStretchDistortionFilter
- IOS OpenGL ES 图像水晶球效果 GPUImageGlassSphereFilter
- IOS OpenGL ES 图像球形折射 GPUImageSphereRefractionFilter
- IOS OpenGL ES 图像色调分离噪点效果 GPUImagePosterizeFilter
- IOS OpenGL ES 图像 CGA 色彩滤镜 GPUImageCGAColorspaceFilter
- IOS OpenGL ES 图像柏林噪点/花边噪点 GPUImagePerlinNoiseFilter
- IOS OpenGL ES 图像加亮边缘 GPUImage3x3ConvolutionFilter
- IOS OpenGL ES 图像浮雕 3d 效果 GPUImageEmbossFilter
- IOS OpenGL ES 图像马赛克圆点 GPUImagePolkaDotFilter
- IOS OpenGL ES 图像侵蚀边缘黑白模糊 GPUImageErosionFilter
- IOS OpenGL ES 图像侵蚀边缘色彩模糊 GPUImageRGBErosionFilter
- IOS OpenGL ES 图像扩展边缘黑白模糊 GPUImageDilationFilter
- IOS OpenGL ES 图像扩展边缘彩色模糊 GPUImageRGBDilationFilter
- IOS OpenGL ES GPUImage 黑白色调模糊 GPUImageOpeningFilter
- IOS OpenGL ES GPUImage 彩色模糊 GPUImageRGBOpeningFilter
- IOS OpenGL ES GPUImage 图像黑白色调模糊/暗色提亮 GPUImageClosingFilter
- IOS OpenGL ES GPUImage 图像彩色调模糊/暗色提亮 GPUImageRGBClosingFilter
- IOS OpenGL ES GPUImage 图像 Lanczos 重取样模糊效果 GPUImageLanczosResamplingFilter
- IOS OpenGL ES GPUImage 图像显示亮度最高的像素,其他为黑 GPUImageNonMaximumSuppressionFilter
- IOS OpenGL ES GPUImage 图像显示亮度最高的像素,其他为黑 GPUImageThresholdedNonMaximumSuppressionFilter
- IOS OpenGL ES GPUImage 图像 Sobel 边缘检测,类似漫画反色 GPUImageSobelEdgeDetectionFilter
- IOS OpenGL ES GPUImage GPUImageWeakPixelInclusionFilter
- IOS OpenGL ES GPUImage GPUImageDirectionalNonMaximumSuppressionFilter
- IOS OpenGL ES GPUImage 图像阈值边缘检测 GPUImageThresholdEdgeDetectionFilter
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分享标题:IOS OpenGL ES GPUImage 图像阈值边缘检测GPUImageThresholdEdgeDetectionFilter
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