發送oclMat到函數創建在運行時

Question

巨大差異我具有3個輸入寫的函數（掩蔽）：

1. inputOCL - 一個oclMat
2. comparisonValue - 雙值
3. 方法 - 一個int變量決定比較方法

對於我的示例，我選擇了method = 1，它代表CMP_GT，測試inputOCL> comparisonValue是否明智。

該函數的目的是將inputOCL中不符合給定copmarison的所有元素歸零。

下面是函數掩蔽：

void masking(cv::ocl::oclMat inputOCL, double comparisonValue, int method){ 
// NOTE: method can be set to 1-->5 corresponding to (==, >, >=, <, <=, !=) 

cv::ocl::oclMat valueOCL(inputOCL.size(), inputOCL.type()); 
valueOCL.setTo(cv::Scalar(comparisonValue)); 
cv::ocl::oclMat logicalOCL; 
cv::ocl::compare(inputOCL, valueOCL, logicalOCL, method); 
logicalOCL.convertTo(logicalOCL, inputOCL.type()); 
cv::ocl::multiply(logicalOCL, inputOCL, inputOCL); 
cv::ocl::multiply(1/255.0, inputOCL, inputOCL); } 

當定時我發現在運行時運行該函數，或者直接運行的計算運行下面的代碼時之間的非常大的差異的函數：

int main(int argc, char** argv){ 

double value1 = 1.23456789; 
double value2 = 1.23456789; 

// initialize matrix 
cv::Mat I(5000, 5000, CV_64F, cv::Scalar(value1)); 
// copy input to GPU 
cv::ocl::oclMat inputOCL(I); 
int method = 1; 
static double start_TIMER; 

// computation done in function 
start_TIMER = cv::getTickCount(); 
masking(inputOCL, value2, method); 
std::cout << "\nFunction runtime = " << ((double)(cv::getTickCount() - start_TIMER))/cv::getTickFrequency() << " Seconds\n"; 

// direct computation 
start_TIMER = cv::getTickCount(); 
cv::ocl::oclMat valueOCL(inputOCL.size(), inputOCL.type()); 
valueOCL.setTo(cv::Scalar(value2)); 
cv::ocl::oclMat logicalOCL; 
cv::ocl::compare(inputOCL, valueOCL, logicalOCL, method); 
logicalOCL.convertTo(logicalOCL, inputOCL.type()); 
cv::ocl::multiply(logicalOCL, inputOCL, inputOCL); 
cv::ocl::multiply(1/255.0, inputOCL, inputOCL); 
std::cout << "\nDirect runtime = " << ((double)(cv::getTickCount() - start_TIMER))/cv::getTickFrequency() << " Seconds\n"; 
} 

運行時可以在此屏幕截圖中看到：

運行時間爲什麼會有這麼大的差異？

Answer 1

我想感謝asarsakov（提醒我注意破壞oclMats的問題）和DarkZeros（注意我忘記破壞函數中的第二個臨時oclMat）。

但是，這並不能反映整個解決方案。似乎我能夠實現相同的'直接'和'功能'結果的唯一方法是使用cv :: ocl :: oclMat &而不是cv :: ocl :: oclMat發送oclMats。

請參閱以下代碼（整個代碼，函數和全部），以獲得相同結果的最終解決方案。通過在主開始處更改布爾變量，我們控制計算（直接或通過函數）以及控制計時器內oclMat的釋放。

#include "opencv2/ocl/ocl.hpp" 
#include <conio.h> 

void masking(cv::ocl::oclMat &inputOCL, cv::ocl::oclMat &valueOCL, cv::ocl::oclMat &logicalOCL, double comparisonValue, int method){ 
// NOTE: the method input is 1-->5 corresponding to (==, >, >=, <, <=, !=) 
valueOCL.setTo(cv::Scalar(comparisonValue)); 
cv::ocl::compare(inputOCL, valueOCL, logicalOCL, method); 
logicalOCL.convertTo(logicalOCL, inputOCL.type()); 
cv::ocl::multiply(logicalOCL, inputOCL, inputOCL); 
cv::ocl::multiply(1/255.0, inputOCL, inputOCL); 
} 

int main(int argc, char** argv){ 

bool direct = 1; // 1 for direct, 0 for function 
bool release = 1; // 1 with releasing temporary oclMat, 0 without releasing them 

// initialize data 
int method = 1; 
static double start_TIMER; 
double value1 = 1.23456789; 
double value2 = 1.23456789; 
cv::Mat I(5000, 5000, CV_64F, cv::Scalar(value1)); 

if (direct){ 
    // direct computation 
    cv::ocl::oclMat inputOCL1(I); 
    cv::ocl::oclMat valueOCL1(inputOCL1.size(), inputOCL1.type()); 
    cv::ocl::oclMat logicalOCL1; 
    start_TIMER = cv::getTickCount(); 
    valueOCL1.setTo(cv::Scalar(value2)); 
    cv::ocl::compare(inputOCL1, valueOCL1, logicalOCL1, method); 
    logicalOCL1.convertTo(logicalOCL1, inputOCL1.type()); 
    cv::ocl::multiply(logicalOCL1, inputOCL1, inputOCL1); 
    cv::ocl::multiply(1/255.0, inputOCL1, inputOCL1);  
    if (release){ valueOCL1.release(); logicalOCL1.release(); } 
    std::cout << "\nDirect runtime = " << ((double)(cv::getTickCount() - start_TIMER))/cv::getTickFrequency() << " Seconds\n"; 
} 

if (!direct){ 
    // computation done in function 
    cv::ocl::oclMat inputOCL2(I); 
    cv::ocl::oclMat valueOCL2(inputOCL2.size(), inputOCL2.type()); 
    cv::ocl::oclMat logicalOCL2; 
    start_TIMER = cv::getTickCount(); 
    masking(inputOCL2, valueOCL2, logicalOCL2, value2, method);  
    if (release){ valueOCL2.release(); logicalOCL2.release(); } 
    std::cout << "\nFunction runtime = " << ((double)(cv::getTickCount() - start_TIMER))/cv::getTickFrequency() << " Seconds\n";  
} 

printf("\nPress any key to exit..."); 
_getch(); 
return 0; 
}