Added sample Windows Universal application (UAP) using videoio logic for video preview and processing.
Signed-off-by: Maxim Kostin <v-maxkos@microsoft.com>pull/4005/head
Maxim Kostin
10 years ago
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// main.cpp
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// Copyright (c) Microsoft Open Technologies, Inc.
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// All rights reserved.
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//
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// (3 - clause BSD License)
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//
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// Redistribution and use in source and binary forms, with or without modification, are permitted provided that
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// the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
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// following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
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// following disclaimer in the documentation and/or other materials provided with the distribution.
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// 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or
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// promote products derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
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// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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// PARTICULAR PURPOSE ARE DISCLAIMED.IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
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// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES(INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT(INCLUDING
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// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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#include "pch.h" |
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#include <opencv2/core.hpp> |
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#include <opencv2/imgproc.hpp> |
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#include <opencv2/features2d.hpp> |
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#include <opencv2/videoio.hpp> |
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#include <opencv2/videoio/cap_winrt.hpp> |
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using namespace cv; |
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namespace video_capture_xaml { |
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void cvMain() |
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{ |
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VideoCapture cam; |
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// open the default camera
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cam.open(0); |
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Mat edges; |
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Mat frame; |
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// process frames
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while (1) |
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{ |
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// get a new frame from camera - this is non-blocking per spec
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cam >> frame; |
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// don't reprocess the same frame again
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// nb if commented then flashing may occur
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if (!cam.grab()) continue; |
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// image processing calculations here
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// nb Mat frame is in RGB24 format (8UC3)
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// select processing type 1 or 2
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#if 0 |
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// image manipulation example #1
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// write color bar at row 100 for 200 rows
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auto ar = frame.ptr(100); |
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int bytesPerPixel = 3; |
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int adjust = (int)(((float)30 / 100.0f) * 255.0); |
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for (int i = 0; i < 640 * 100 * bytesPerPixel;) |
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{ |
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ar[i++] = adjust; // R
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i++; // G
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ar[i++] = 255 - adjust; // B
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} |
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#else |
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// image processing example #2
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// apply 'canny' filter
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cvtColor(frame, edges, COLOR_RGB2GRAY); |
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GaussianBlur(edges, edges, Size(7, 7), 1.5, 1.5); |
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Canny(edges, edges, 0, 30, 3); |
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cvtColor(edges, frame, COLOR_GRAY2RGB); |
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#endif |
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// important step to get XAML image component updated
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winrt_imshow(); |
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} |
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} |
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} |
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After Width: | Height: | Size: 801 B |
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After Width: | Height: | Size: 329 B |
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After Width: | Height: | Size: 2.1 KiB |
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After Width: | Height: | Size: 429 B |
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notes for OpenCV WinRT implementation: |
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cvMain() in main.cpp |
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implements the image processing and OpenCV app control |
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it is running on a background thread, started by XAML |
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see file main.cpp |
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in the Application project |
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class VideoCapture_WinRT: |
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implements the IVideoCapture interface from OpenCV |
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video is initialized and frames are grabbed on the UI thread |
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see files cap_winrt.hpp/cpp |
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class HighguiBridge, a singleton |
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implements the OpenCV Highgui functions for XAML (limited at this time), |
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and also bridges to the UI thread functions for XAML and video operations. |
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see files cap_winrt_highgui.hpp/cpp |
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class Video, a singleton |
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encapsulates the Media Foundation interface needed for video initialization and grabbing. |
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called through Highgui and XAML, only on the UI thread |
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see files cap_winrt_video.hpp/cpp |
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threading: |
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requests from the OpenCV bg thread to the Video/XAML UI thread |
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are made through HighguiBridge::requestForUIthreadAsync(), which uses |
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the "progress reporter" method provided by the WinRT class |
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IAsyncActionWithProgress. Also the bg thread is started by create_async(). |
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see file MainPage.xaml.cpp |
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in the Application project |
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After Width: | Height: | Size: 2.5 KiB |
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After Width: | Height: | Size: 753 B |
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After Width: | Height: | Size: 14 KiB |
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After Width: | Height: | Size: 1.1 KiB |
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After Width: | Height: | Size: 2.1 KiB |
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After Width: | Height: | Size: 4.4 KiB |