cpuimage 开源之

前年学习opengl做的一个小东西。

原本计划将gpuimage 的算法一个一个转写成cpu版本 c,c++ 版本。

gpuimage 项目参考:

https://github.com/BradLarson/GPUImage

https://github.com/BradLarson/GPUImage2

https://github.com/CyberAgent/android-gpuimage

后来工作琐事太多，这个事情就搁置了。

今天翻出来，从c++改为c代码，

没有经过验证各个算法的正确性，回头发现再修正吧。

贴上头文件，

把绝大部分gpuimage的算法都用cpu的处理思路重新写了下，做一点基础优化。

#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

typedef struct {
    //色阶最小值
    int levelMinimum;
    //色阶中间值
    int levelMiddle;
    //色阶最大值
    int levelMaximum;
    //最小输出值
    int minOutput;
    //最大输出值
    int  maxOutput;
    //是否应用
    bool Enable;
}cpuLevelParams;

void rgb2yiq(unsigned char  *R, unsigned char * G, unsigned char * B, short  *Y, short * I, short * Q);
void yiq2rgb(short  *Y, short * I, short * Q, unsigned char  *R, unsigned char * G, unsigned char * B);
void rgb2hsv(const unsigned char  *R, const unsigned char  *G, const unsigned char  *B, unsigned char  *H, unsigned char  *S, unsigned char  *V);
void hsv2rgb(const unsigned char  *H, const unsigned char  *S, const unsigned char  *V, unsigned char  *R, unsigned char *G, unsigned char  *B);
void rgb2ycbcr(unsigned char R, unsigned char G, unsigned char B, unsigned char * y, unsigned char * cb, unsigned char * cr);
void ycbcr2rgb(unsigned char y, unsigned char Cb, unsigned char Cr, unsigned char * R, unsigned char * G, unsigned char * B);

//--------------------------Color adjustments--------------------------
void CPUImageGrayscaleFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride);
// float redAdjustment = 1.0f, float greenAdjustment = 1.0f, float blueAdjustment = 1.0f
void CPUImageRGBFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, float redAdjustment, float greenAdjustment, float blueAdjustment);
// float thresholdMultiplier = 1.0f
void CPUImageAverageLuminanceThresholdFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, float thresholdMultiplier);
void CPUImageAverageColor(unsigned char* Input, int Width, int Height, int Stride, unsigned char * AverageR, unsigned char * AverageG, unsigned char  * AverageB, unsigned char  * AverageA);
void CPUImageLuminosity(unsigned char* Input, int Width, int Height, int Stride, unsigned char  * Luminance);
// float intensity = 1.0f
void CPUImageColorMatrixFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, float* colorMatrix, float intensity);
//int intensity = 100
void CPUImageSepiaFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, int intensity);
// unsigned char colorToReplaceR = 0, unsigned char colorToReplaceG = 160, unsigned char colorToReplaceB = 0, float thresholdSensitivity = 0.2f, float smoothing = 0.1f
void CPUImageChromaKeyFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, unsigned char colorToReplaceR, unsigned char colorToReplaceG, unsigned char colorToReplaceB, float thresholdSensitivity, float smoothing);
// int intensity = 100
void CPUImageLookupFilter(unsigned char* Input, unsigned char* Output, unsigned char* lookupTable, int Width, int Height, int Stride, int intensity);

// float saturation = 1.0
void CPUImageSaturationFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, float saturation);
// float gamma = 1.0f
void CPUImageGammaFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, float gamma);
//  float contrast = 1.0f
void CPUImageContrastFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, float contrast);
//float exposure = 0.0f
void CPUImageExposureFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, float exposure);
//int brightness = 0.0f
void CPUImageBrightnessFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, int brightness);
//unsigned char firstColorR = 0, unsigned char firstColorG = 0, unsigned char firstColorB = 0.5 * 255, unsigned char secondColorR = 1.0f * 255, unsigned char secondColorG = 0, unsigned char secondColorB = 0, int intensity = 100
void CPUImageFalseColorFilter(unsigned char* Input, unsigned char* Output, int  Width, int  Height, int Stride, unsigned char firstColorR, unsigned char firstColorG, unsigned char firstColorB, unsigned char secondColorR, unsigned char secondColorG, unsigned char secondColorB, int intensity);
// float distance = 0.3, float slope = 0, int intensity = 100
void CPUImageHazeFilter(unsigned char* Input, unsigned char* Output, int  Width, int  Height, int Stride, float distance, float slope, int intensity);
// float opacity = 1.0f
void CPUImageOpacityFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, float opacity);
void CPUImageLevelsFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, cpuLevelParams  *redLevelParams, cpuLevelParams  *greenLevelParams, cpuLevelParams  *blueLevelParams);
// float hueAdjust = 90.0f
void CPUImageHueFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, float hueAdjust);
// float shadowTintR = 1.0f, float shadowTintG = 0.0f, float shadowTintB = 0.0f, float highlightTintR = 0.0f, float highlightTintG = 0.0f, float highlightTintB = 1.0f, float shadowTintIntensity = 0.0f, float highlightTintIntensity = 0.0f
void CPUImageHighlightShadowTintFilter(unsigned char* Input, unsigned char* Output, int  Width, int  Height, int Stride, float shadowTintR, float shadowTintG, float shadowTintB, float highlightTintR, float highlightTintG, float highlightTintB, float shadowTintIntensity, float highlightTintIntensity);
//  float shadows = 0.0f, float highlights = 1.0f
void CPUImageHighlightShadowFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, float shadows, float highlights);
//  unsigned char filterColorR = 0.6 * 255, unsigned char filterColorG = 0.45 * 255, unsigned char filterColorB = 0.3 * 255, int intensity = 100
void CPUImageMonochromeFilter(unsigned char* Input, unsigned char* Output, int  Width, int  Height, int Stride, unsigned char filterColorR, unsigned char filterColorG, unsigned char filterColorB, int intensity);

void CPUImageColorInvertFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride);
// unsigned char colorAlpha = 255
void CPUImageSolidColorGenerator(unsigned char* Output, int Width, int Height, int Stride, unsigned char colorR, unsigned char colorG, unsigned char colorB, unsigned char colorAlpha);
// unsigned char threshold = 127
void CPUImageLuminanceThresholdFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, unsigned char threshold);
// float temperature = 5000, float tint = 0
void CPUImageWhiteBalanceFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, float temperature, float tint);
//float vibrance = 1.2
void CPUImageVibranceFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, float vibrance);
// float skinToneAdjust = 0.3f, float skinHue = 0.05f, float skinHueThreshold = 80.0f, float maxHueShift = 0.25f, float maxSaturationShift = 0.4f, int upperSkinToneColor = 0
void CPUImageSkinToneFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, float skinToneAdjust, float skinHue, float skinHueThreshold, float maxHueShift, float maxSaturationShift, int upperSkinToneColor);
//float fraction = 0.05f
void CPUImageAutoLevel(const unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, float fraction);
//--------------------------Color adjustments--------------------------

//--------------------------Image processing--------------------------
void CPUImageGaussianBlurFilter(unsigned char * Input, unsigned char * Output, int Width, int Height, int Stride, float GaussianSigma);
// float GaussianSigma = 4, int intensity = 100
void CPUImageUnsharpMaskFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, float GaussianSigma, int intensity);
//int Radius = 3
void CPUImageBoxBlurFilter(unsigned char *Input, unsigned char *Output, int Width, int Height, int Stride, int Radius);
// float Radius = 4, int sharpness = 1, int intensity = 100
void CPUImageSharpenFilter(unsigned char* Input, unsigned char* Output, int Width, int Height, int Stride, float Radius, int sharpness, int intensity);
void CPUImageResamplingFilter(unsigned char* Input, unsigned int Width, unsigned int Height, unsigned int Stride, unsigned char* Output, int newWidth, int newHeight, int dstStride);
void CPUImageCropFilter(const unsigned char *Input, int Width, int Height, int srcStride, unsigned char *Output, int cropX, int cropY, int dstWidth, int dstHeight, int dstStride);
//--------------------------Image processing--------------------------

授人以鱼不如授人以渔，发出来，权当抛砖引玉吧。

项目地址:

https://github.com/cpuimage/cpuimage

哪天心血来潮，用omp优化，用simd优化，嗯会有时间的。

也许哪天翻翻硬盘，又翻出一些老古董了。

这是刚学图像算法时候做的练习，代码风格渣，思路烂，不喜请喷。

若有其他相关问题或者需求也可以邮件联系俺探讨。

邮箱地址是: 
gaozhihan@vip.qq.com