manisha_singh asked . 2022-02-01

Why do I receive unexpected results when using FFT2/IFFT2 with

Why do I receive unexpected results when using FFT2/IFFT2 with a sequence of image arithmetic functions?

I have an image on which I perform some operations in the frequency domain. I do this by using FFT2 to transform the image, and use image processing functions such as IMADD, IMSUBTRACT, etc. to change the transformed image. I then use IFFT2 to change the image back from the frequency domain. However, the image does not look like I would expect, and does not seem to have any of the features of the original image.

image , arithmetic , imadd , fft2 , ifft2 , im2double

Expert Answer

Kshitij Singh answered . 2024-12-21 01:41:56

The output from FFT2 is always a double. Therefore, the rest of the sequence of operations will be working with doubles. The image arithmetic functions maintain the types of the input. Therefore, they will treat the data as doubles, even though you may have intended for them to be treated like the original image. When you use the image arithmetic functions on a double, it is also possible to produce negative results, because the output will be a double array. Finally, the output from IFFT2 is also always a double and could contain negative values. Therefore, the result of the sequence of operations will be an array of double, instead of the original type.

To work around this issue, you should use IM2DOUBLE to convert the image data to a double, perform the operations, and then convert back to the original data type.

Example:

I = imread('moon.tif');

% convert to double

ID = im2double(I);

%  transform to frequency domain

FID = fft2(ID);

% insert image arithmetic operations here

% convert back to spatial domain

IFID = ifft2(FID);

% convert back to uint8

I8 = im2uint8(IFID);

Not satisfied with the answer ?? ASK NOW

Recent Matlab Projects

Classification of Covid and Non-Covid Lungs CT-Scan using Deep Learning with MATLAB

Matlab simulation on Wind Energy system

Frequently Asked Questions

MATLAB offers tools for real-time AI applications, including Simulink for modeling and simulation. It can be used for developing algorithms and control systems for autonomous vehicles, robots, and other real-time AI systems.

MATLAB Online™ provides access to MATLAB® from your web browser. With MATLAB Online, your files are stored on MATLAB Drive™ and are available wherever you go. MATLAB Drive Connector synchronizes your files between your computers and MATLAB Online, providing offline access and eliminating the need to manually upload or download files. You can also run your files from the convenience of your smartphone or tablet by connecting to MathWorks® Cloud through the MATLAB Mobile™ app.

Yes, MATLAB provides tools and frameworks for deep learning, including the Deep Learning Toolbox. You can use MATLAB for tasks like building and training neural networks, image classification, and natural language processing.

MATLAB and Python are both popular choices for AI development. MATLAB is known for its ease of use in mathematical computations and its extensive toolbox for AI and machine learning. Python, on the other hand, has a vast ecosystem of libraries like TensorFlow and PyTorch. The choice depends on your preferences and project requirements.

You can find support, discussion forums, and a community of MATLAB users on the MATLAB website, Matlansolutions forums, and other AI-related online communities. Remember that MATLAB's capabilities in AI and machine learning continue to evolve, so staying updated with the latest features and resources is essential for effective AI development using MATLAB.

Without any hesitation the answer to this question is NO. The service we offer is 100% legal, legitimate and won't make you a cheater. Read and discover exactly what an essay writing service is and how when used correctly, is a valuable teaching aid and no more akin to cheating than a tutor's 'model essay' or the many published essay guides available from your local book shop. You should use the work as a reference and should not hand over the exact copy of it.

Matlabsolutions.com provides guaranteed satisfaction with a commitment to complete the work within time. Combined with our meticulous work ethics and extensive domain experience, We are the ideal partner for all your homework/assignment needs. We pledge to provide 24*7 support to dissolve all your academic doubts. We are composed of 300+ esteemed Matlab and other experts who have been empanelled after extensive research and quality check.

Matlabsolutions.com provides undivided attention to each Matlab assignment order with a methodical approach to solution. Our network span is not restricted to US, UK and Australia rather extends to countries like Singapore, Canada and UAE. Our Matlab assignment help services include Image Processing Assignments, Electrical Engineering Assignments, Matlab homework help, Matlab Research Paper help, Matlab Simulink help. Get your work done at the best price in industry.