how to increase the resolution of an image?

Hi guys; I want some help, I ve an image which I want to increase its resolution 5 times, but I don't know how I can do that, if u ve any ideas, plz let me know.thanks

Answer 1

[Image Analyst]

You can increase the number of elements by using imresize

bigImage = imresize(smallImage, 5);

Of course that does not increase the real world spatial resolution (only Hollywood can do that), so if the image is blurry, you'll still have the same blurry image, just with 5 times as many pixels.

[Hamza]

thanks for your answer, I appreciate ur help I thought that I can improve the resolution of the image.

[Image Analyst]

It depends on what definition of "resolution" you're talking about - spatial resolution like in real world units and the ability to resolve small object located close together (which cannot be increases just by interpolating), or resolution like they talk about with computer which is simply the number of pixels (which can be increased). If you know the point spread function you can increase spatial resolution. Se deconvlucy() function.

[Hamza]

thanks for your replay, actually I tried to use interpolation methods, but does n't seem 2b working with my matlab version, what I want is to see clearly small parts of my image.my image is jpg.

[Image Analyst]

Like I said, imresize will only increase the number of pixels and it will not increase the ability to resolve small objects in the image. To do that you need knowledge of how they were blurred (what the point spread function is) and use filters like wiener(), wiener2(), or deconvlucy().

[Image Analyst]

Here's an example of how Hollywood thinks you can do it: http://bitsandpieces.us/2013/11/19/gee-whiz-csi-technology/

[oza san]

dear sir i want to enhance the resolution using cubic interpolation mind if you can help me. in case if you have some sample codes i will be grateful.

Answer 2

[Hasan Nawaz]

How can I change resolution of satellite images r satellite data(enviromental data)?

[Image Analyst]

What do you mean by resolution? You can't change the optical resolution of the image - that's determined by the satellite. You can however change the image size in pixels with imresize(). Of course increasing the number of pixels won't get you any more optical resolution (except in Hollywood movies).

Answer 3

[r r]

I want to extract nanoparticles from the image and want to increase the resolution and clarity of the image

[Image Analyst]

How is this announcement an "Answer" to Hamza's question?

[Walter Roberson]

That does not appear to be a question about MATLAB.

You need to research image enhancement algorithms.

MATLAB does not have an "increase resolution" function. It has an image resize operation, but image resizing does not increase resolution. In order to increase resolution, you need additional information beyond what is in the image itself.

For example processing satellite images to read license plates involves adding additional information about what different kinds of license plates look like, and about the fonts used for different kinds of license plates.

See also

https://www.mathworks.com/help/vision/ug/sharpen-an-image.html