JackChen (104061563)

Project 1 / Image Filtering and Hybrid Images

Overview

The project is related to

hybrid image

Implementation

1. zero padding (I use mirror padding method)

   • Example(I only domenstrate lefttop and left side): %lefttop for i=indexbase_c:-1:1 for j=indexbase_r:-1:1 img_pad(j,i)=img_g(indexbase_r-j+1,indexbase_c-i+1); end end %left for i=indexbase_c:-1:1 for j=indexbase_r:rows img_pad(j,i)=img_g(j-indexbase_r+1,indexbase_c-i+1); end end result :
   

2. convolution tmp_val=filter.*img_pad(start_r-floor(indexbase_r/2):start_r+floor(indexbase_r/2),start_c-floor(indexbase_c/):start_c+floor(indexbase_c/2));%multiply selected area on the image and the filter value=sum(sum(tmp_val)); output_tmp(j,i)=value;

   explanation: I used matrix multiplication to multiply selected window of the original picture and the filter. Then I used sum() funciton to add the value up. At last, assign the value to a new matrix.

3. Repeat mirror padding and convolution for three dimentions

Installation

• Matlab https://ca.nctu.edu.tw/news-list/software-release/208-matlab-r2014b-release
• execute the proj1.m file in the code directory.

Results