Chebyshev Type I low pass filter design image filter

How do i apply chebyshev type I low pass filter to filter an image?

Answer 1

[Hari]

Hi Abraham,

I understand that you want to apply a Chebyshev Type I low-pass filter to an image. To apply a Chebyshev Type I low-pass filter to filter an image in MATLAB, you can follow these steps:

1. Define the filter specifications: Determine the filter order, passband ripple, and stopband attenuation based on your requirements. Choose the cutoff frequency to separate the desired low-frequency components from the high-frequency components.
2. Design the Chebyshev Type I filter: Use the “cheby1” function in MATLAB to design the filter. Specify the filter order, passband ripple, and stopband attenuation. Obtain the filter coefficients using:

    [b, a] = cheby1(filter_order, passband_ripple, cutoff_frequency, 'low');

3. Read and convert the image to double precision and apply filter on the image.

    % Read and convert the image to double precision
    image = imread('  your_image.jpg);
    image = im2double(image);
    % Apply the filter to the image
    filtered_image = filter(b, a, image);

By following the above steps, you can apply a Chebyshev Type I low-pass filter to the image, resulting in a filtered image with reduced high-frequency components beyond the cutoff frequency.

Refer to the documentation of “cheby1” function to know more about Chebyshev Type I filter design using MATLAB.

Chebyshev Type I filter design - MATLAB cheby1 (mathworks.com)

Thanks,

Hari.