Image Mask for Image Matting

I am working on image matting use the code in https://www.mathworks.com/matlabcentral/fileexchange/31412-learning-based-digital-matting.

function demo()

%%parameters to change according to your requests
fn_im='C:\Users\Chen\Desktop\CAS781\learningBasedMatting\data\input_lowres\plasticbag.png';
fn_mask='C:\Users\Chen\Desktop\CAS781\learningBasedMatting\data\trimap_lowres\Trimap1\plasticbag.png';

%%configuration
addpath(genpath('C:\Users\Chen\Desktop\CAS781\learningBasedMatting\code'));

%%read image and mask
imdata=imread(fn_im);
mask=getMask_onlineEvaluation(fn_mask);

%%compute alpha matte
[alpha]=learningBasedMatting(imdata,mask);

%%show and save results
figure,subplot(2,1,1); imshow(imdata);
subplot(2,1,2),imshow(uint8(alpha*255));

% imwrite(uint8(alpha*255),fn_save);

I want to use my own image. I am wondering how to get fn_mask. Could someone help me?

Thanks!

Answer 1

[Renee Coetsee]

Since the file exchange submission has the contact information of the author, you can try contacting them directly. It looks like the trimap images came from the following link:

http://www.alphamatting.com/datasets.php

in the "User input (trimaps)" download.