I am blending two images of different sizes in matlab. I want to blend the source image(512x512x3 ) to a specific location in destination image(1920x1080x3). I am using vision.AlphaBlender, but i am getting an error saying step ; sys = tf(a,b);

Here is the code of my program I1=imread('Lenna.png'); >> I2=imread('Lenna.png'); >> I1=imread('DestinationImage.jpg'); >> I1=im2double(I1); >> I2=im2double(I2); >> halphablend = vision.AlphaBlender; >> location_mask=[500 500]; >> JImgBlend=step(I1, I2, location_mask);

Please help me with this program.