Discover MakerZone

MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

Learn more

Discover what MATLAB® can do for your career.

Opportunities for recent engineering grads.

Apply Today

how does imresize work in matlab?

Asked by Utkarsh Deshmukh on 21 Jan 2013

how does matlab implement the command: imresize(<image>,<scaling factor>,'bicubic');

the other types of interpolations are easy to understand and implement. but in case of bicubic, when the scaling factor is less than 1, it does the anti-aliasing filter operation. how does this operation work?

0 Comments

Utkarsh Deshmukh

Products

No products are associated with this question.

1 Answer

Answer by Image Analyst on 21 Jan 2013
Accepted answer

2 points define a line, 3 define a quadratic, and 4 define a cubic. So if you have just the two adjacent pixels, you can do a bilinear interpolation, a bicubic interpolation uses two pixels on each side, in each direction. Same things as bilinear, just using 4 pixels instead of two to get the value of the pixel "in the middle". Not sure how it does antialiasing - perhaps it blurs it a little after the interpolation. Why do you ask?

2 Comments

Utkarsh Deshmukh on 21 Jan 2013

Thank You sir, I was really trying to understand the process of resizing. For the part of antialiasing, can i use simple gaussian filter? i am unable to understand how to get the kernel for the anti-aliasing filter.

Utkarsh Deshmukh on 21 Jan 2013

also sir, i wanted to know when does it do the antialiasing? before the interpolation or after the interpolation?

Image Analyst

Contact us