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kernel.cu
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kernel.cu
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#include<stdio.h>
#include<stdlib.h>
#include <opencv2/opencv.hpp>
#include <cfloat>
#include <opencv2/core/cuda/common.hpp>
#include <opencv2/core/cuda/border_interpolate.hpp>
#include <opencv2/core/cuda/vec_traits.hpp>
#include <opencv2/core/cuda/vec_math.hpp>
__device__ float3 bgr2xyz(uchar3 src) {
float scr_r = src.z / 255.0;
float scr_g = src.y / 255.0;
float scr_b = src.x / 255.0;
float tmp[3];
tmp[0] = 100.0 * ((scr_r > .04045) ? pow((scr_r + .055) / 1.055, 2.4) : scr_r / 12.92);
tmp[1] = 100.0 * ((scr_g > .04045) ? pow((scr_g + .055) / 1.055, 2.4) : scr_g / 12.92);
tmp[2] = 100.0 * ((scr_b > .04045) ? pow((scr_b + .055) / 1.055, 2.4) : scr_b / 12.92);
float3 xyz;
xyz.x = .4124 * tmp[0] + .3576 * tmp[1] + .1805 * tmp[2];
xyz.y = .2126 * tmp[0] + .7152 * tmp[1] + .0722 * tmp[2];
xyz.z = .0193 * tmp[0] + .1192 * tmp[1] + .9505 * tmp[2];
return xyz;
}
__device__ float3 xyz2lab(float3 src) {
float scr_z = src.z / 108.883;
float scr_y = src.y / 100.;
float scr_x = src.x / 95.047;
float PI = 3.14159265358979323846;
float v[3];
v[0] = (scr_x > .008856) ? pow(scr_x, 1. / 3.) : (7.787 * scr_x) + (16. / 116.);
v[1] = (scr_y > .008856) ? pow(scr_y, 1. / 3.) : (7.787 * scr_y) + (16. / 116.);
v[2] = (scr_z > .008856) ? pow(scr_z, 1. / 3.) : (7.787 * scr_z) + (16. / 116.);
float3 lab;
lab.x = (116. * v[1]) - 16.;
lab.y = 500. * (v[0] - v[1]);
lab.z = 200. * (v[1] - v[2]);
/*
float C = sqrt(pow(lab.y, 2) + pow(lab.z, 2));
float h = atan2(lab.z, lab.y);
h += (angle * PI) / 180.0;
lab.y = cos(h) * C;
lab.z = sin(h) * C;
*/
return lab;
}
__device__ float3 bgr2lab(uchar3 c) {
return xyz2lab(bgr2xyz(c));
}
__device__ float3 lab2xyz(float3 src) {
float fy = (src.x + 16.0) / 116.0;
float fx = src.y / 500.0 + fy;
float fz = fy - src.z / 200.0;
float3 lab;
lab.x = 95.047 * ((fx > 0.206897) ? fx * fx * fx : (fx - 16.0 / 116.0) / 7.787);
lab.y = 100.000 * ((fy > 0.206897) ? fy * fy * fy : (fy - 16.0 / 116.0) / 7.787);
lab.z = 108.883 * ((fz > 0.206897) ? fz * fz * fz : (fz - 16.0 / 116.0) / 7.787);
return lab;
}
__device__ float3 xyz2bgr(float3 src) {
src.x /= 100.0;
src.y /= 100.0;
src.z /= 100.0;
float tmp[3];
tmp[0] = 3.2406 * src.x - 1.5372 * src.y - 0.4986 * src.z;
tmp[1] = -0.9689 * src.x + 1.8758 * src.y + 0.0415 * src.z;
tmp[2] = 0.0557 * src.x - 0.2040 * src.y + 1.0570 * src.z;
float3 bgr;
bgr.z = 255.0 * ((tmp[0] > 0.0031308) ? ((1.055 * pow(tmp[0], (1.0 / 2.4))) - 0.055) : 12.92 * (tmp[0]));
bgr.y = 255.0 * ((tmp[1] > 0.0031308) ? ((1.055 * pow(tmp[1], (1.0 / 2.4))) - 0.055) : 12.92 * (tmp[1]));
bgr.x = 255.0 * ((tmp[2] > 0.0031308) ? ((1.055 * pow(tmp[2], (1.0 / 2.4))) - 0.055) : 12.92 * (tmp[2]));
return bgr;
}
__device__ float3 lab2bgr(float3 src) {
return xyz2bgr(lab2xyz(src));
}
__global__ void hueShift(const cv::cuda::PtrStep<uchar3> src, cv::cuda::PtrStep<uchar3> dst, int rows, int cols, int x, int y)
{
const int dst_x = blockDim.x * blockIdx.x + threadIdx.x;
const int dst_y = blockDim.y * blockIdx.y + threadIdx.y;
float3 lab_ref = bgr2lab(src(y, x));
float delta_E;
float delta_L;
float delta_C;
float delta_H;
float K_L = 1;
float S_L = 1;
float K_C = 1;
float S_C;
float K_H = 1;
float S_H;
float C1;
float C2;
float K1 = 0.045;
float K2 = 0.015;
float delta_a;
float delta_b;
if (dst_x < cols && dst_y < rows)
{
float3 lab_src = bgr2lab(src(dst_y, dst_x));
delta_L = lab_ref.x - lab_src.x;
C1 = sqrt(pow(lab_ref.y, 2) + pow(lab_ref.z, 2));
C2 = sqrt(pow(lab_src.y, 2) + pow(lab_src.z, 2));
delta_C = C1 - C2;
S_C = 1 + K1 * C1;
S_H = 1 + K2 * C1;
delta_a = lab_ref.y - lab_src.y;
delta_b = lab_ref.z - lab_src.z;
delta_H = sqrt(pow(delta_a, 2) + pow(delta_b, 2) - pow(delta_C, 2));
delta_E = sqrtf(pow(delta_L / (K_L * S_L), 2) + pow(delta_C / (K_C * S_C), 2) + pow(delta_H / (K_H * S_H), 2));
if (delta_E < 5) {
dst(dst_y, dst_x).x = 0;
dst(dst_y, dst_x).y = 0;
dst(dst_y, dst_x).z = 255;
}
else
{
dst(dst_y, dst_x).x = src(dst_y, dst_x).x;
dst(dst_y, dst_x).y = src(dst_y, dst_x).y;
dst(dst_y, dst_x).z = src(dst_y, dst_x).z;
}
}
}
int divUp(int a, int b)
{
return ((a % b) != 0) ? (a / b + 1) : (a / b);
}
void colorTransfCUDA(cv::cuda::GpuMat& src, cv::cuda::GpuMat& dst, int dimX, int dimY, int x, int y)
{
const dim3 block(dimX, dimY);
const dim3 grid(divUp(dst.cols, block.x), divUp(dst.rows, block.y));
hueShift << <grid, block >> > (src, dst, dst.rows, dst.cols, x, y);
}