1 / 10

JPEG Compression in Matlab

JPEG Compression in Matlab. Michael Christensen. Outline. Motivation General Method Still to do…. Motivation. Instruction Provide a simple example. Method. Step 1. Shift by 2 7. Method, Cont. Step 2. 2D Discrete Cosine Transform. Method, Cont. . /. Step 3. Quantization.

markv
Download Presentation

JPEG Compression in Matlab

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. JPEG Compression in Matlab Michael Christensen

  2. Outline • Motivation • General Method • Still to do…

  3. Motivation • Instruction • Provide a simple example

  4. Method Step 1 Shift by 27

  5. Method, Cont. Step 2 2D Discrete Cosine Transform

  6. Method, Cont. . / Step 3 Quantization

  7. Method, Cont. ( ) = −26, −3, 0, −3, −3, −6, 2, −4, 1, −4, 1, 1, 5, 1, 2, −1, 1, −1, 2, 0, 0, 0, 0, 0, −1, −1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

  8. Method, Cont. ( ) −26, −3, 0, −3, −3, −6, 2, −4, 1, −4, 1, 1, 5, 1, 2, −1, 1, −1, 2, 0, 0, 0, 0, 0, −1, −1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 Shorten = = −26, −3, 0, −3, −3, −6, 2, −4, 1, −4, 1, 1, 5, 1, 2, −1, 1, −1, 2, 0, 0, 0, 0, 0, −1, −1, EOB 101001110011101111110111010110101011101000011001101110101110101010101101011011101011011110110111010001101110001101111011011000110101010111011101001101111010111011000110011110111010101100110101101110101010011110101110101010

  9. Method, Final File Headers, etc. 101001110011101111110111010110101011101000011001101110101110101010101101011011101011011110110111010001101110001101111011011000110101010111011101001101111010111011000110011110111010101100110101101110101010011110101110101010 + = Output File

  10. Still To Do… • Input multiple file types • Modifiable quantization matrix for variable compression rates • JPEG file conversion back to uncompressed format

More Related