Nima asked . 2024-01-19

Is there any correlation kernel that keeps the roi of an image

Is there any correlation kernel that keeps the roi of an image while removes the remained pixels?

hi,

I have already defined the roi of an image (I) by using roicolor, now I need to keep the pixels of I which are within roi and throw out the remaining pixels (the dimensions of output image should be equal to the dimensions of the roi array). I used roifilt2 but I do not know what correlation kernel (h) can be used for my purpose...

Image Processing and Computer Vision , Image Processing Toolbox , Image Filtering and Enhancemen

Expert Answer

Prashant Kumar answered . 2024-12-21 02:31:36

Can you specify a particular filter kernel such that roifilt2() will preserve the area selected by the mask and discard the region outside? No.

Can you contrive a means to misuse roifilt2() for this task? Yes.

Consider the two images:

% a single-channel image
inpict = imread('cameraman.tif');

% a logical mask
mask = imread('sources/standardmods/cman/cmantifmk.png')>128;

% invert the mask and use a zero-valued kernel
%outpict = roifilt2(0,inpict,~mask);

% invert the mask and use a function handle which returns a 
% zero-valued array of the same size and class as the image
outpict = roifilt2(inpict,~mask,@(x) 0*x);

Of course, both of these examples will fail for int16 images.

Should you use roifilt2() to do this job? No.

IPT roifilt2() is a tool to apply a function to an image segment and then composite the filtered segment back into the original image with the ostensible goal of reducing the amount of data that needs to be filtered. It combines a filtering process and a compositing process, and in this case, the filtering process is entirely unnecssary. To use roifilt2() for compositing alone would not only be wasteful and cryptic, it would impose unnecessary restrictions on what you could do.

If you want to do a basic compositng task like filling a masked region with a solid color, just do that.

% presuming the following:
% mask is logical-class
% image is not signed-integer class
% mask and image have same number of channels
outpict = inpict;
outpict(~mask) = 0;

This example requires about 13% as much time as misusing roifilt().

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.