# Lossless Image Compression Using MATLAB

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MATLAB is a powerful tool for analyzing images and signals for developing applications. One of the applications of image compression with MATLAB using a graphical user interface is described in this article. Here we talk about lossless image compression using MATLAB.

Cameras are nowadays being provided with more and more megapixels to improve the quality of captured images. With improvement in image quality, size of the image file also increases.

Due to speed limitation of the Internet, it takes more time to upload good-quality images that are of bigger sizes. A user needs to compress the image without degrading its quality. Mobile manufacturers need algorithms in their cameras that enable storing the images in reduced sizes without degrading their quality.

There are two types of compression algorithms, namely, loss-less and lossy-image compression. This article proposes a technique to compress the captured image to reduce its size while maintaining its quality. A number of images were considered to check the veracity of the proposed algorithm.

In this article, discrete cosine transform algorithm is used, which compresses the image with a good compression ratio.

The flowchart of the process is shown in Fig. 1.

The image is read through MATLAB to capture its pixels. After obtaining the compressed image, peak-signal-noise ratio (PSNR) and mean-square error (MSE) are calculated using the following relationships:

where m and n are the number of rows and columns. Image1 and Image2 are the original and compressed images, respectively.

After compression, there should not be much change in the quality of the image. MSE indicates an error between the original image and compressed image. It should be as small as possible.

where R is the maximum fluctuation in the input image data type (maximum possible pixel value of image). PSNR is related to MSE and it gives the amount of noise in a compressed image. PSNR should be as high as possible.

All equations are implemented in MATLAB in the form of functions.

Some images and their associated MATLAB graphical interfaces are shown in Figs 2 to 5.

Lalit G. Patil is a lecturer in Department of Electrical Engineering, M.S. University of Baroda, Gujarat. His areas of research include signal processing, image processing and control systems

1. What should I do to compress whole video once I convert it in to frames?
Thank You

• Here’s the reply from author Lalit Patil:
Yes, Write a “for Loop” code to compress frames one by one. When complete compression of frames is done then merge frames into video. It will be compressed video.

2. Sir…i also want to do the compression process for a video….please help me…also i need the decompression code also…

• Decompression is not possible once it is compressed.

For video compression, you can convert video into frames.
Then compress each frame.
Then merge all frames into video again.

Check video size. It will be compressed.!!

3. can u give methe simulink of this project?
its dynamic model equation?
transformation eqn wrt transfer func
stability of function
error calculation
root locus plots

4. Whenever I try to lead the picture
the program does nothing it doesnt upload it
the computer makes sound (question)
so it cant compress when it cant load the image

• Open ImageCompression1.m Matlab code. Run the program by clicking ‘Run’ button. A screen opens up. Click on ‘Select the image’ option on the left side. You need to load any .jpg format image file from your PC. Once image is loaded, you can see the image on the screen. Now, click on ‘Compress image’ option on the right side. Wait for some time until the compressed image pops up on the screen.

• I cant select the image , when i click the select image button the shows an error in GUI_STATE function and gui_mainfcu the code is running but i cant select the picture

5. hello, please apart from matlab, what other software do i need to install in the authenticating e-assessment users via keystrokes and facial biometrics recognition

6. i have tried your code and it work…
can you explain me about method that use on code?
what method do you use?
thanks

• Adaptive filter is for filtering noise in images. If you want to compress data, then i don’t know how it works. But you can look for research papers. If they have done, then there might be an algorithm. You will get idea if you have enough knowledge about filters and their implementation. All you have to do is play with MATRIX only.

• Convert Video into Frames. Code is available in google search. Then make a Loop program to compress each frame. Then Make video from Frames.. it will be a compressed video. Best of Luck..

7. i am getting the following errors:
>> ImageCompression1
Insufficient number of outputs from right hand side of equal sign to satisfy assignment.

Error in ImageCompression1>pushbutton1_Callback (line 89)
SIZE = fileinfo.bytes;

Error in gui_mainfcn (line 95)
feval(varargin{:});

Error in ImageCompression1 (line 42)
gui_mainfcn(gui_State, varargin{:});

Error while evaluating UIControl Callback
Can someone help?
ASAP

Undefined function ‘dctmtx’ for input arguments of type ‘double’.

Error in ImageCompression1>pushbutton2_Callback (line 110)
T = dctmtx(8);

Error in gui_mainfcn (line 95)
feval(varargin{:});

Error in ImageCompression1 (line 42)
gui_mainfcn(gui_State, varargin{:});

Error while evaluating UIControl Callback

9. This is the reply from the author Lalit Patil.
“This is the code written in MATLAB 2013 version.! As the years passes, functionality is changed in newer versions. You might be using some higher version. Try in MATLAB 2013.”

10. can anyone give me another image compressor matlab code using PNG or TIFF method? or can anyone help me about compress image using png and tiff through matlab code?

11. is there any ource code using huffman coding algorithm????????
plz rply
and after selecting image is not compressed….itz shows nothng
plz help

12. Sir, I am having trouble in displaying video on the axes.
Because the axes is not the size of video, the video resizes and become pixelated.

How can I have an axes resizing based on the input video?

here is my code.

handles.output = hObject;
axes(handles.axes1);
vid = videoinput(‘winvideo’, 2);
himage = image(zeros(160,120,3),’parent’,handles.axes1);
preview(vid,himage);
guidata(hObject,handles);

13. The program is working fine but the images are not being shown in the MATLAB window. Please help!!

• the code which you gave for Lossless Image Compression Using MATLAB is working but in the figure window images are not displaying ..
what to do ….pls help me
i have used the code which is present in this site
its not displaying images in figure window

14. Once it is compressed, You can not decompress. Because you have modified pixels in mathematical form. Compress and Decompress means only reduction in Size of image without reducing Quality. So no need to Decompress.!!

15. i have used the code for Lossless Image Compression Using MATLAB which is present in your site
its compressing the image file ,
but its not displaying
images of uncompressed and compressed images in figure window.
its displaying only size of uncompressed image

pls help me

thanks

16. hey sir i need matlab code on image compression for capsule endoscopy using Integer wavelet packet transform embedded with DPCM

17. sir, I need Matlab source code for medical image compression using guassian hermite polynomial (for compression CT Scan image).plssss share the code.i need imediately

18. greetings sir
please i wish to seek for a working matlab code to do bilevel lossless image compression, i prefer using huffman coding. please i will appreciate your help. thank you in anticipation

Please turn off anti-virus from your computer while opening the zip file. Maybe the anti-virus is deleting the source files.

19. sir i have used the code for Lossless Image Compression Using MATLAB which is present in your site
its compressing the image file ,
but its not displaying
images of uncompressed and compressed images in figure window.
its displaying only size of uncompressed image

20. This is the code written in MATLAB 2013 version. The functionality is changed in newer versions. Try in MATLAB 2013.

21. Sir, I run the code for image compression but it is showing the images in figure window. It is showing the size of compressed image and original image but not the images ?
Why ? Kindly tell me !!!!