Details of the project-2

The fourth method is to use “imadjust function” to adjust contrast radio of the image. The next step is adding Gaussian noise and adding filter to noise reduction. Finally, using “Sobel operator” to measure the edge of the pattern.

1.    Setting the lower input=0.57, higher input=0.6, output is [0 1]. The four pictures in the second figure is produced by three different filtering windows(3x3, 5x5, 7x7). The result is :

2.    Setting the lower input=0.27, higher input=0.35, output is [0 1]. The result is:

The objective of adjusting contrast radio is to make the one of wanted patterns get more clear; the processing of adding noise and denoising can dim the interferential areas; "Sobel operator" can detect the edge of the parttern. After the procedure above, we can get clear edges of two patterns.