Assignment 1: Panoramic Image Stitching

Date: Oct 9, 2020

Link: https://felixnie.github.io/modules/2020-12-04-ee5731-2-panoramic-image-stitching/

Files in Root Directory

Some files and libraries are used in multiple parts. Sharing them can make the project more compact. But this needs you to setup the root path of the project by setting the rootpath variable in some of the scripts. Please read the instructions in the front of each script, or call 'help filename' in MATLAB.

• *.jpg - Input images
• vlfeat-0.9.21 - VLFeat libraries, for running SIFT algorithm

Part 1: 2D Convolution

• part1.m - Main file
• my_conv2.m - Function for 2D convolution
• my_norm.m - Function for image normalization

Part 2: SIFT Features and Descriptors

There are 2 subdirectories for this part, each contains a main .m file.

One is based on siftDemoV4 (SIFT demo program, Version 4, July 2005), an implementation of SIFT keypoint detector, created by David Lowe.

Another great implementation is VLFeat created by Andrea Vedaldi.

For more information, please run:

help p2_sift_keypoints
help p2_sift_descriptors

• siftDemoV4

  • p2_sift_keypoints.m - Main file
  • File from siftDemoV4 (Only relevant files are shown)
    • sift.m - Function to extract keypoints and descriptors
    • showkeys.m - Show the keyboints as vectors

• vlfeat

  • p2_sift_descriptors.m - Main file

Part 3: Homography

• p3_homography.m - Main file
• *.jpg/png - Input images

For more information, run:

help p3_homography

Part 4: Manual Homography + Sticthing

• p4_homography_sticthing.m - Main file

For more information, run:

help p4_homography_sticthing

Part 5: Homography + RANSAC

• p5_homography_ransac.m - Main file

For more information, run:

help p5_homography_ransac

Part 6: Basic Panoramic Image

• p6_homography_ransac_multi_image.m - Main file
• my_match.m - Function to match the descriptors using squared Euclidean distance
• my_ransac.m - RANSAC algorithm
• my_homography.m - Function to compute homography matrix
• result.fig - Output

For more information, run:

help p6_homography_ransac_multi_image

Part 7: Advanced Panoramic Image

• p7_unordered_stitching.m - Main file
• my_match.m - Function to match the descriptors using squared Euclidean distance
• my_ransac.m - RANSAC algorithm
• my_homography.m - Function to compute homography matrix
• my_crazyfunction.m - Function to recursively compute H and do the transformation