void addAdditiveNoize(const cv::Mat& src, cv::Mat& dst, double mean, double stddev) {
CV_Assert(src.type() == CV_8UC1);
cv::RNG rng;
src.copyTo(dst);
cv::Mat noize(dst.rows, dst.cols, dst.type(), cv::Scalar(0));
cv::randn(noize, mean, stddev);
dst += noize;
}
fullcircle::Sequence::Ptr mk_perlin_noise() {
std::cout << "Generating Perlin noise demo sequence." << std::endl;
fullcircle::ColorScheme::Ptr smash(new fullcircle::ColorSchemeSmash());
fullcircle::Sequence::Ptr seq(new fullcircle::Sequence(25,8,8));
fullcircle::FrameFader::Ptr fader(new fullcircle::FrameFader(5,25));
fullcircle::PerlinNoise::Ptr noize(new fullcircle::PerlinNoise(
3, // octaves
.42, // freq
2.4, // amplitude
42 // seed
));
for( uint32_t frameID = 0; frameID < 100; ++frameID) {
fullcircle::Frame::Ptr frame(new fullcircle::Frame(8,8));
frame->fill_whole(smash->get_background());
for( uint16_t x = 0; x < 8; ++x) {
for( uint16_t y = 0; y < 8; ++y) {
float n=noize->get_3d(x/8.0f, y/8.0f, frameID/10.0f);
// determine color
if (0<=n && n<0.3) {
frame->set_pixel(x,y,smash->get_primary());
} else if (0.3<=n && n<0.7) {
frame->set_pixel(x,y,smash->get_secondary());
} else if (0.7<=n && n<=1.0) {
frame->set_pixel(x,y,smash->get_background());
} else {
std::cout << "Error: Unknown noise value: " << n << std::endl;
}
}
}
if (seq->size() == 0)
seq->add_frame(frame);
else
seq = (*seq) << fader->fade(seq->get_last_frame(), frame);
}
return seq;
}
