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Showing content from http://www.arrayfire.org/docs/image_processing_2optical_flow_8cpp-example.htm below:

ArrayFire: image_processing/optical_flow.cpp

#include <math.h>

#include <stdio.h>

#include <string.h>

#include <algorithm>

float dx_kernel[] = {-1.0f / 6.0f, -1.0f / 6.0f, -1.0f / 6.0f,

0.0f / 6.0f, 0.0f / 6.0f, 0.0f / 6.0f,

1.0f / 6.0f, 1.0f / 6.0f, 1.0f / 6.0f};

float dy_kernel[] = {-1.0f / 6.0f, 0.0f / 6.0f, 1.0f / 6.0f,

-1.0f / 6.0f, 0.0f / 6.0f, 1.0f / 6.0f,

-1.0f / 6.0f, 0.0f / 6.0f, 1.0f / 6.0f};

dt = constant(1, 1, 2) / 4.0;

Ix = convolve(I1, dx) + convolve(I2, dx);

Iy = convolve(I1, dy) + convolve(I2, dy);

It = convolve(I2, dt) - convolve(I1, dt);

}

static void optical_flow_demo(bool console) {

wnd(

);

double time_total = 10;

const float h_mean_kernel[] = {1.0f / 12.0f, 2.0f / 12.0f, 1.0f / 12.0f,

2.0f / 12.0f, 0.0f, 2.0f / 12.0f,

1.0f / 12.0f, 2.0f / 12.0f, 1.1f / 12.0f};

(ASSETS_DIR

);

I2 =

(ASSETS_DIR

);

diffs(Ix, Iy, It, I1, I2);

time_start, time_last;

time_start = time_last = timer::start();

int iter = 0, iter_last = 0;

double max_rate = 0;

while (true) {

iter++;

const float alphasq = 0.1f;

num = Ix * u_ + Iy * v_ + It;

den = alphasq + Ix * Ix + Iy * Iy;

u = u_ - (Ix * tmp) / den;

v = v_ - (Iy * tmp) / den;

if (!console) {

wnd.grid(2, 2);

wnd(0, 0).image(I1, "I1");

wnd(1, 0).image(I2, "I2");

wnd(0, 1).image(u, "u");

wnd(1, 1).image(v, "v");

wnd.show();

}

double elapsed = timer::stop(time_last);

if (elapsed > 1) {

double rate = (iter - iter_last) / elapsed;

double total_elapsed = timer::stop(time_start);

time_last = timer::start();

iter_last = iter;

max_rate = std::max(max_rate, rate);

if (total_elapsed >= time_total) { break; }

if (!console)

printf(" iterations per second: %.0f (progress %.0f%%)\n",

rate, 100.0f * total_elapsed / time_total);

}

}

if (console) {

printf(" ### optical_flow %f iterations per second (max)\n", max_rate);

}

}

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

int device = argc > 1 ? atoi(argv[1]) : 0;

bool console = argc > 2 ? argv[2][0] == '-' : false;

try {

printf("Horn-Schunck optical flow\n");

optical_flow_demo(console);

fprintf(stderr,

, e.

());

throw;

}

return 0;

}

Window object to render af::arrays.

A multi dimensional data container.

dim4 dims() const

Get dimensions of the array.

Generic object that represents size and shape.

An ArrayFire exception class.

virtual const char * what() const

Returns an error message for the exception in a string format.

@ AF_COLORMAP_COLORS

Colors, aka. Rainbow.

array constant(T val, const dim4 &dims, const dtype ty=(af_dtype) dtype_traits< T >::ctype)

C++ Interface to generate an array with elements set to a specified value.

AFAPI void setDevice(const int device)

Sets the current device.

AFAPI array loadImage(const char *filename, const bool is_color=false)

C++ Interface for loading an image.

AFAPI array convolve(const array &signal, const array &filter, const convMode mode=AF_CONV_DEFAULT, const convDomain domain=AF_CONV_AUTO)

C++ Interface for convolution any(one through three) dimensional signals.

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