IOS OpenGL ES GPUImage 图像显示亮度最高的像素,其他为黑 GPUImageNonMaximumSuppressionFilte
目录
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零基础 OpenGL (ES) 学习路线推荐 : OpenGL (ES) 学习目录 >> OpenGL ES GPUImage 使用
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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.
GPUImageNonMaximumSuppressionFilter 属于 GPUImage 图像视觉效果相关,用来处理**图像图像显示亮度最高的像素,其他为黑效果**。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 图像显示亮度最高的像素,其他为黑 GPUImageNonMaximumSuppressionFilter
//@Time:2022/06/21 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 kGPUImageNonMaximumSuppressionFragmentShaderString = SHADER_STRING
(
uniform sampler2D inputImageTexture;
varying highp vec2 textureCoordinate;
varying highp vec2 leftTextureCoordinate;
varying highp vec2 rightTextureCoordinate;
varying highp vec2 topTextureCoordinate;
varying highp vec2 topLeftTextureCoordinate;
varying highp vec2 topRightTextureCoordinate;
varying highp vec2 bottomTextureCoordinate;
varying highp vec2 bottomLeftTextureCoordinate;
varying highp vec2 bottomRightTextureCoordinate;
void main()
{
lowp float bottomColor = texture2D(inputImageTexture, bottomTextureCoordinate).r;
lowp float bottomLeftColor = texture2D(inputImageTexture, bottomLeftTextureCoordinate).r;
lowp float bottomRightColor = texture2D(inputImageTexture, bottomRightTextureCoordinate).r;
lowp vec4 centerColor = texture2D(inputImageTexture, textureCoordinate);
lowp float leftColor = texture2D(inputImageTexture, leftTextureCoordinate).r;
lowp float rightColor = texture2D(inputImageTexture, rightTextureCoordinate).r;
lowp float topColor = texture2D(inputImageTexture, topTextureCoordinate).r;
lowp float topRightColor = texture2D(inputImageTexture, topRightTextureCoordinate).r;
lowp float topLeftColor = texture2D(inputImageTexture, topLeftTextureCoordinate).r;
// Use a tiebreaker for pixels to the left and immediately above this one
lowp float multiplier = 1.0 - step(centerColor.r, topColor);
multiplier = multiplier * (1.0 - step(centerColor.r, topLeftColor));
multiplier = multiplier * (1.0 - step(centerColor.r, leftColor));
multiplier = multiplier * (1.0 - step(centerColor.r, bottomLeftColor));
lowp float maxValue = max(centerColor.r, bottomColor);
maxValue = max(maxValue, bottomRightColor);
maxValue = max(maxValue, rightColor);
maxValue = max(maxValue, topRightColor);
gl_FragColor = vec4((centerColor.rgb * step(maxValue, centerColor.r) * multiplier), 1.0);
}
);
#else
NSString *const kGPUImageNonMaximumSuppressionFragmentShaderString = SHADER_STRING
(
uniform sampler2D inputImageTexture;
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;
void main()
{
float bottomColor = texture2D(inputImageTexture, bottomTextureCoordinate).r;
float bottomLeftColor = texture2D(inputImageTexture, bottomLeftTextureCoordinate).r;
float bottomRightColor = texture2D(inputImageTexture, bottomRightTextureCoordinate).r;
vec4 centerColor = texture2D(inputImageTexture, textureCoordinate);
float leftColor = texture2D(inputImageTexture, leftTextureCoordinate).r;
float rightColor = texture2D(inputImageTexture, rightTextureCoordinate).r;
float topColor = texture2D(inputImageTexture, topTextureCoordinate).r;
float topRightColor = texture2D(inputImageTexture, topRightTextureCoordinate).r;
float topLeftColor = texture2D(inputImageTexture, topLeftTextureCoordinate).r;
// Use a tiebreaker for pixels to the left and immediately above this one
float multiplier = 1.0 - step(centerColor.r, topColor);
multiplier = multiplier * (1.0 - step(centerColor.r, topLeftColor));
multiplier = multiplier * (1.0 - step(centerColor.r, leftColor));
multiplier = multiplier * (1.0 - step(centerColor.r, bottomLeftColor));
float maxValue = max(centerColor.r, bottomColor);
maxValue = max(maxValue, bottomRightColor);
maxValue = max(maxValue, rightColor);
maxValue = max(maxValue, topRightColor);
gl_FragColor = vec4((centerColor.rgb * step(maxValue, centerColor.r) * multiplier), 1.0);
}
);
#endif
二.效果演示
使用 GPUImageNonMaximumSuppressionFilter 完成图像显示亮度最高的像素,其他为黑****,原图如下:
使用 GPUImageNonMaximumSuppressionFilter 完成图像显示亮度最高的像素,其他为黑****,效果如下:
三.源码下载
OpenGL ES Demo 下载地址 : IOS OpenGL ES GPUImage 图像显示亮度最高的像素,其他为黑 GPUImageNonMaximumSuppressionFilter
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- IOS – OpenGL ES 设置图像 lookup 滤镜 GPUImageLookupFilter
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- IOS – OpenGL ES 绘制十字 GPUImageCrosshairGenerator
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- 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
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