mirror of
https://github.com/Laex/Delphi-OpenCV.git
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101 lines
3.3 KiB
ObjectPascal
101 lines
3.3 KiB
ObjectPascal
// *****************************************************************
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// Delphi-OpenCV Demo
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// Copyright (C) 2013 Project Delphi-OpenCV
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// ****************************************************************
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// Contributor:
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// Laentir Valetov
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// email:laex@bk.ru
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// ****************************************************************
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// You may retrieve the latest version of this file at the GitHub,
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// located at git://github.com/Laex/Delphi-OpenCV.git
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// ****************************************************************
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// The contents of this file are used with permission, subject to
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// the Mozilla Public License Version 1.1 (the "License"); you may
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// not use this file except in compliance with the License. You may
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// obtain a copy of the License at
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// http://www.mozilla.org/MPL/MPL-1_1Final.html
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//
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// Software distributed under the License is distributed on an
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// "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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// implied. See the License for the specific language governing
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// rights and limitations under the License.
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// *******************************************************************
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program clsVideoCapture;
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{$APPTYPE CONSOLE}
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{$POINTERMATH ON}
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{$R *.res}
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uses
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System.SysUtils,
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ocv.mat,
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ocv.highgui,
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ocv.highgui_c;
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Const
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VK_ESCAPE = 27;
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DESIRED_CAMERA_WIDTH: Integer = 320;
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DESIRED_CAMERA_HEIGHT: Integer = 200;
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windowName = 'Test VideoCapture'; // Name shown in the GUI window.
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// Get access to the webcam.
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procedure initWebcam(videoCapture: TOCVVideoCapture; cameraNumber: Integer = CV_CAP_ANY);
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begin
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// Get access to the default camera.
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// Surround the OpenCV call by a try/catch block so we can give a useful error message!
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videoCapture.open(cameraNumber);
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if not videoCapture.isOpened() then
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begin
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Writeln('ERROR: Could not access the camera!');
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Halt(1);
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end;
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Writeln('Loaded camera ', cameraNumber);
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end;
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Var
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cameraNumber: Integer = CV_CAP_ANY;
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camera: TOCVVideoCapture;
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cameraFrame: TOCVMat = nil;
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begin
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try
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camera := CreateVideoCapture();
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initWebcam(camera, cameraNumber);
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// Try to set the camera resolution. Note that this only works for some cameras on
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// some computers and only for some drivers, so don't rely on it to work!
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camera.setValue(CV_CAP_PROP_FRAME_WIDTH, DESIRED_CAMERA_WIDTH);
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camera.setValue(CV_CAP_PROP_FRAME_HEIGHT, DESIRED_CAMERA_HEIGHT);
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// Create a GUI window for display on the screen.
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namedWindow(windowName); // Resizable window, might not work on Windows.
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// Run forever, until the user hits Escape to "break" out of this loop.
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while true do
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begin
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// Grab the next camera frame. Note that you can't modify camera frames.
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if camera.read(cameraFrame) then
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begin
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if Assigned(cameraFrame) and (cameraFrame.empty()) then
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begin
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Writeln('ERROR: Couldn''t grab the next camera frame.');
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Halt(1);
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end;
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if Assigned(cameraFrame) then
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imshow(windowName, cameraFrame);
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end;
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// IMPORTANT: Wait for atleast 20 milliseconds, so that the image can be displayed on the screen!
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if (waitKey(20) = VK_ESCAPE) then // Escape Key
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break; // Quit the program!
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end;
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camera.release;
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cvDestroyAllWindows;
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except
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on E: Exception do
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Writeln(E.ClassName, ': ', E.Message);
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end;
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end.
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