2023 EEL715 Digital Image Processing Note Use MATLAB Software or C only Set I 1 Make | Assignment Collections
Computer Science 2023 EEL715: Digital Image Processing
2023 EEL715 Digital Image Processing Note Use MATLAB Software or C only Set I 1 Make | Assignment Collections
EEL715: Digital Image Processing
Note: Use MATLAB Software or ‘C’ only
Set I
1. Make a BMP image file with a white square in center in paintbrush.
Display the magnitude of its 2-D Fourier Transform in the form of the
image. Bring the (0, 0) – frequency coordinate to the center of this
display. Change the size of the square and
observe the change in the corresponding DFT display. Comment on the
observation. Rotate the image by some angle (say 45°) and observe the
change in FT display. Explain your observation with mathematical
equations.
2. Load an image. Take its FFT. Reconstruct the image using only
a) magnitude information of FFT
b) Phase information of FFT
Comment on the observation.
3. Load an image in MATLAB in gray shades. Change the number of gray
levels to 64, 16, 8, 4, 2 to display the same image. Comment on the
observation. Now change the spatial resolution of this image. Explain
the effect of sampling error.
4. Take an image having only two point sources. Pass it through a low
pass filter defined
(a) by a mask in spatial domain
(b) in frequency domain
Observe the result. Change the cut-off frequency of the filter and comment
on the result.
5. Take an image that has black and white alternating vertical strips.
Pass it through a high pass filter defined in
(a) in frequency domain
(b) by a mask in spatial domain.
Observe the result. Change the cut-off frequency of the filter and comment
on the result.
6. Take an image. Carry out edge detection in both directions using
(a) Sobel operator
(b) Prewitt operator
(c) Roberts operator
Do not use in-built commands. Use the corresponding masks and then carry
out edge detection.
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