mirror of
https://github.com/Laex/Delphi-OpenCV.git
synced 2024-11-15 15:55:53 +01:00
100 lines
3.1 KiB
ObjectPascal
100 lines
3.1 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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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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*)
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program Transparency1;
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{$APPTYPE CONSOLE}
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{$R *.res}
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uses
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System.SysUtils,
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System.Math,
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ocv.highgui_c,
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ocv.core_c,
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ocv.core.types_c,
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ocv.imgproc_c,
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ocv.imgproc.types_c,
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uResourcePaths;
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const
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batmanimg = cResourceMedia + 'batman.png';
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parrotimg = cResourceMedia + 'parrot.png';
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const
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px = 200;
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py = 100;
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var
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overlay: pIplImage = nil;
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underlay: pIplImage = nil;
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rgba: array [0 .. 3] of pIplImage;
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i, j, k: Integer;
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opacity: Double;
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overlayPx, srcPx: Byte;
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begin
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try
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overlay := cvLoadImage(batmanimg, CV_LOAD_IMAGE_UNCHANGED);
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underlay := cvLoadImage(parrotimg, CV_LOAD_IMAGE_UNCHANGED);
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cvNamedWindow('overlay_source', CV_WINDOW_AUTOSIZE);
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cvShowImage('overlay_source', overlay);
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cvNamedWindow('underlay_source', CV_WINDOW_AUTOSIZE);
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cvShowImage('underlay_source', underlay);
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for i := 0 to 3 do
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rgba[i] := cvCreateImage(cvGetSize(overlay), IPL_DEPTH_8U, 1);
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cvSplit(overlay, rgba[2], rgba[1], rgba[0], rgba[3]);
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cvNamedWindow('alpha_overlay', CV_WINDOW_AUTOSIZE);
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cvShowImage('alpha_overlay', rgba[3]);
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for i := 0 to overlay^.width - 1 do
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for j := 0 to overlay^.height - 1 do
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for k := 0 to overlay^.nChannels - 1 do
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begin
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opacity := (overlay^.imageData[j * overlay^.widthStep + i * overlay^.nChannels + 3]) / 255;
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overlayPx := overlay^.imageData[j * overlay^.widthStep + i * overlay^.nChannels + k];
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srcPx := underlay^.imageData[(py + j) * underlay^.widthStep + (i + px) * overlay^.nChannels + k];
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underlay^.imageData[(py + j) * underlay^.widthStep + (i + px) * overlay^.nChannels + k] :=
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Trunc(srcPx * (1 - opacity) + overlayPx * opacity);
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end;
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cvNamedWindow('underlay', CV_WINDOW_AUTOSIZE);
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cvShowImage('underlay', underlay);
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cvWaitKey(0);
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cvReleaseImage(overlay);
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cvReleaseImage(underlay);
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for i := 0 to 3 do
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cvReleaseImage(rgba[i]);
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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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