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

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

Answer 1

[Clive Fox]

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);

[Clay Swackhamer]

Great thanks.

[cui,xingxing]

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.

Answer 2

[Muhammad Danish]

Still showing error known as

Error using AlphaBlender/step

The Mask input must be a vector or a matrix.