visioncpp/examples/rgb2hsv.cpp at master · codeplaysoftware/visioncpp · GitHub

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// This file is part of VisionCpp, a lightweight C++ template library

// for computer vision and image processing.

// Contact: visioncpp@codeplay.com

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

// http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

/// \file rgb2hsv.cc

///

/// -------Example--------

/// RGB -> HSV

/// \brief this example convert an RGB pixel to HSV

// include VisionCpp

#include <visioncpp.hpp>

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

if (argc < 4) {

std::cout << "You need to provide 3 uchar values" << std::endl;

std::cout << "example>: ./example_rgb2hsv 100 13 145" << std::endl;

return -1;

}

// where VisionCpp will run.

auto dev = visioncpp::make_device<visioncpp::backend::sycl,

visioncpp::device::cpu>();

// create a host container for input data

std::shared_ptr<unsigned char> in_rgb(

new unsigned char[3], [](unsigned char *dataMem) { delete[] dataMem; });

in_rgb.get()[0] = atoi(argv[1]);

in_rgb.get()[1] = atoi(argv[2]);

in_rgb.get()[2] = atoi(argv[3]);

// create a host container for output data

std::shared_ptr<unsigned char> out_hsv(

new unsigned char[3], [](unsigned char *dataMem) { delete[] dataMem; });

// exiting this scope will sync data

{

// definition of the VisionCpp pipeline:

// create terminal nodes - a leaf node ( data node ) of the expression tree.

// terminal struct takes 4 arguments

// 1st template parameter specifies the data U8 (unsigned char) C3 (three

// channels)

// 2nd: the number of columns in the storage

// 3rd: the number of rows in the storage

// 4th: the underlying storage type - currently only Buffer2D supported

auto data =

visioncpp::terminal<visioncpp::pixel::U8C3, 1, 1,

visioncpp::memory_type::Buffer2D>(in_rgb.get());

auto data_out =

visioncpp::terminal<visioncpp::pixel::U8C3, 1, 1,

visioncpp::memory_type::Buffer2D>(out_hsv.get());

// unsigned char -> float RGB storage conversion

auto node = visioncpp::point_operation<visioncpp::OP_U8C3ToF32C3>(data);

// float RGB to float HSV conversion

auto node2 = visioncpp::point_operation<visioncpp::OP_RGBToHSV>(node);

// helper node that allows display of HSV

// for unsigned char: V <- 255*V, S <- 255*S, H <- H/2 ( to fit in range of

// 0..255 )

auto node3 = visioncpp::point_operation<visioncpp::OP_HSVToU8C3>(node2);

// assign operation that writes output of the pipe to output terminal node

auto pipe = visioncpp::assign(data_out, node3);

// execute the pipeline

// 1st template parameter defines if VisionCpp back-end fuses the expression

// 2nd & 3rd shared memory sizes ( column, row )

// 4th & 5th local work group size ( column , row )

visioncpp::execute<visioncpp::policy::Fuse, 1, 1, 1, 1>(pipe, dev);

}

printf("RGB: %u %u %u \nHSV: %u %u %u \n", in_rgb.get()[0], in_rgb.get()[1],

in_rgb.get()[2], out_hsv.get()[0], out_hsv.get()[1], out_hsv.get()[2]);

return 0;

}

visioncpp/examples/rgb2hsv.cpp at master · codeplaysoftware/visioncpp · GitHub

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