How to wrote code for Ramp Filter and show the firgure?

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mohd akmal masud 2024-5-18

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评论： Image Analyst 2024-5-19

采纳的回答： Abhishek Kumar Singh

Dear All,

Please help me how to plot the Ramp filter as picture attached.

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Answer 1

Abhishek Kumar Singh 2024-5-18

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I am assuming that the filter is linear in frequency domain, i.e., it amplifies the frequency components linearly w.r.t frequency.

Here's a simple MATLAB script you can use to get started that defined a ramp filter and then plots it:

% Define parameters

N = 512; % Number of points in the filter

fs = 1000; % Sampling freq. in Hz

f = fs * (-N/2:N/2-1)/N; % Freq. vector

% Creating the ramp filter in the freq. domain

rampFilter = abs(f);

% Plot

figure;

plot(f, rampFilter);

title('Ramp Filter');

xlabel('Frequency (Hz)');

ylabel('Amplitude');

grid on;

Note that you might need to adjust the filter's length (N), apply a window function to control the filter's side lobes, or normalize the filter's response based on your specific requirements.

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mohd akmal masud 2024-5-19

THANK YOU VERY MUCH @Abhishek Kumar Singh

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Answer 2

Image Analyst 2024-5-18

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https://ww2.mathworks.cn/matlabcentral/answers/2120286-how-to-wrote-code-for-ramp-filter-and-show-the-firgure#answer_1459851

在 MATLAB Online 中打开

You can use linspace to create the filter. Like

numPoints = 101; % Whatever

bothRamps = zeros(1, numPoints); % Preallocate

% Make descending ramp with linspace().

leftRamp = linspace(126, 0, 51);

% Make ascending ramp with linspace().

rightRamp = linspace(0, 126, 51);

% Put them each into our filter vector.

bothRamps(1 : 51) = leftRamp;

bothRamps(51 : 101) = rightRamp;

% Create x axis.

x = linspace(-1, 1, numPoints);

% Plot the filter vector.

plot(x, bothRamps, 'b-', 'LineWidth', 2);

grid on;

xlabel('x');

ylabel('Filter Value');

% Put text label in the middle like the example.

text(0, 82, 'Ramp Filter', 'FontSize', 30, 'HorizontalAlignment', 'Center', 'VerticalAlignment', 'Bottom')

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mohd akmal masud 2024-5-19

THANK YOU VERY MUCH @Image Analyst

Image Analyst 2024-5-19

You're welcome. Just be aware that my answer gives the x and y range the same as in the picture you wanted to reproduce, unlike the answer that you accepted.

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