Computer Vision with OpenCV 3 and Qt5

Benchmarking

QTest offers the QBENCHMARK and QBENCHMARK_ONCE macros to measure the performance (benchmark) of function calls or any other piece of code. These two macros differ only in the number of times they repeat a piece of code to measure its performance, with the latter, obviously, running the code only once. You can use these macros in the following way:

QBENCHMARK 
{ 
    // Piece of code to be benchmarked 
} 

Again, we can use this in our previous example to measure the performance of the PixelCounter class. You can simply add the following line to the end of the testPixelCount function:

QBENCHMARK 
{ 
    c.countPixels(filename); 
} 

If you run the test again, you'll see outputs similar to the following in the test log output. Note that the numbers ...