How to use Mask the Source image in vision.AlphaBlender?

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SUSHIRDEEP NARAYANA 2015-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/183080-how-to-use-mask-the-source-image-in-vision-alphablender

评论： cui,xingxing 2022-9-17

I tried using this as suggested in Mathworks help but its showing error. Halphablender=vision.AlphaBlender('MaskSource','Input port','Mask','BinaryMask','LocationSource', 'Input port'); Its displaying The MaskSource property is not relevant in this configuration of the System object. Can someone please help me with this problem

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Answer 1

Clive Fox 2016-11-2

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https://ww2.mathworks.cn/matlabcentral/answers/183080-how-to-use-mask-the-source-image-in-vision-alphablender#answer_241690

编辑：Walter Roberson 2017-6-22

在 MATLAB Online 中打开

I had the same issue but MAthwork Tech gave the answer below:

Thank you for contacting MathWorks Technical Support.

The issue you are facing is because to use the variable 'mask', it has to be defined previously. Executing the following commands demonstrates the role of the mask parameter:

>> % load images
>> I1 = im2single(imread('blobs.png'));
>> I2 = im2single(imread('circles.png'));
>> % plot original images
>> figure
>> subplot(1,2,1);
>> imshow(I1);
>> subplot(1,2,2);
>> imshow(I2);
>> % full mask
>> halphablend = vision.AlphaBlender('Operation', 'Binary mask', 'MaskSource', 'Input port'); 
>> mask = ones(size(I2));
>> J1 = step(halphablend, I1, I2, mask); 
>> % upper left corner of the mask is set to 0s
>> mask(1:end/2,1:end/2) = 0;
>> J2 = step(halphablend, I1, I2, mask); 
>> % plot
>> figure;
>> imshow(J1);
>> figure;
>> imshow(J2);

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Clay Swackhamer 2017-6-21

Great thanks.

cui,xingxing 2022-9-17

The above example program should be integrated into the official documentation, however the official documentation for the vision.AlphaBlender function example is too sketchy and should be replaced.

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