www.gusucode.com > vision 源码程序 matlab案例代码 > vision/SystemObjectDesignVision1StepCreateConfigTunableExample.m
%% Tunable Edge Detection System Design with System Objects % This example shows how to create a system that finds the edges of objects % in a video stream, using System objects. System objects are components % you can use to create your system in MATLAB. %% Create and Configure Components at the Same Time % This section of the example shows how to create your System object(TM) % components and configure the desired properties at the same time. Specify % each property with a |'Name'|,|Value| argument pair. % % For the video file reader object, specify the file to read and set the % image color space. % % For the alpha blender object, specify the type of operation to use. % % For the video player objects, specify the names, the window size, and % the window position. hVideoSrc = vision.VideoFileReader('vipmen.avi', ... 'ImageColorSpace', 'Intensity'); hAB = vision.AlphaBlender('Operation', 'Highlight selected pixels'); WindowSize = [190 150]; hVideoOrig = vision.VideoPlayer('Name', 'Original',... 'Position',[10 100 WindowSize]); hVideoEdges = vision.VideoPlayer('Name', 'Edges',... 'Position',[210 100 WindowSize]); hVideoOverlay = vision.VideoPlayer('Name', 'Overlay',... 'Position',[410 100 WindowSize]); %% Change a Tunable Property in Your System % You can change the threshold value as your code is running by modifying an % object property. This example modifies the |Location| property of the % |AlphaBlender| object. The change takes effect the next time the object % runs (in this case, at the next iteration of the while loop). while ~isDone(hVideoSrc) frame = step(hVideoSrc); % Read input video edges = edge(frame,'Prewitt',15/256); % Edge detection composite = hAB(frame,edges); % AlphaBlender hAB.Location(1) = hAB.Location(1)+1; % Offset edges if (hAB.Location(1)==120) hAB.Location = [1 1]; % wrap end hVideoOrig(frame); % Display original hVideoEdges(edges); % Display edges hVideoOverlay(composite); % Display edges overlaid end