zhangyx96 / THU-Digital-Image-Processing

the homework for the Digital Image Processing course of professor Yang Wenming

Digital-Image-Processing

experiment 1 Noising & Filtering

• Preparation – adding noise to board-orig.bmp:

  • Noise 1: Salt&Pepper (25%)
  • Noise 2: Gauss(20%,m=20,viarance=400)

• Methods to be developed and tested:

  • Alpha-trimmed mean filter
  • Adaptive median filter

• Evaluation of results

experiment 2 Canny Edge Detector

• Results of my detector

  (1) Lena

    

  (2) house

    

experiment 3 Texture Descriptors

• Co-occurrence matrix (共生矩阵)
• 不变矩 $\psi_1$ ~ $\psi_7$

Project 1 BMP Loading and Interpolation

• Task1:

1. Read and display “Up or Down.bmp” file
2. Write “U” or “D” into this Bmp as your answer
3. Save 2) as an answer.bmp

• Task2:  For tsukuba-left.bmp(gray, 8bits/pixels, 384*288 pixels)

1. Bicubic interpolation into 1152*864 pixels
2. Rotate +35 degree

Project 3 Filtering in Frequency Domain

• Homomorphic Filtering (同态滤波器)
• DFT and IDFT myDFT2.m, myIDFT2.m
• Histogram equalization (直方图均衡) myhisteq.m

  

Project 4 Constrained Least Squares Filtering

• Task

  (1) Image blurring by Motion Model:

  Input：ImageOrg & H, a=0.1, b=0.1 and T=1

  Output：ImageBlur

  (2) Constrained Least Squares Filtering

  Input：ImageBlur & H, a=0.1, b=0.1 and T=1, you may estimate $σ^2+μ^2$

  Output：ImageOrg

• Result

  Origin Picture

  

  Blurred Picture

  

  Recovered Picture