How Does a Jpeg Work

In: Computers and Technology

Submitted By yatush
Words 1599
Pages 7
How JPEG works

Introduction - Images
An image is a 2D matrix of values Color images consist of 3 RGB matrices, Grayscale images consist of one This basic format is BMP

Introduction - JPEG
JPEG – Joint Photographic Expert Group Late 1980’s, early 1990’s Consumer level computers
Relatively high processing power Low bandwidth.

Goal: File size↓ Picture quality~ Voted as international standard in 1992 Photos Scanned text or images with sharp transitions

Introduction - Motivation
2 Observations:
A large majority of useful image content changes slowly across images Experiments show that the human eye is less sensitive to loss of high spatial frequencies

Now let’s see how we can use these observations!!!

Phase 1: Color transform Phase 2: Divide the picture Phase 3: Conversion to frequency domain Phase 4: Quantization Phase 5: Entropy Coding Comparison to other formats

Outline – phase 1 (lossless)
Phase 1: Color transform Phase 2: Divide the picture Phase 3: Conversion to frequency domain Phase 4: Quantization Phase 5: Entropy Coding Comparison to other formats

Color transform RGB->YCbCr

RGB Image


Color transform RGB->YCbCr
Transformation in the color space RGB has all the information, however, if we want to encode, we can’t decide which of the Red/Green/Blue is more important. Y – brightness (luma), Cb – Chromatic blue, Cr – Chromatic red. Only Y will show black/white TV. More bits are used for Y, less for the Cb/Cr.

To help protect y our priv acy , PowerPoint has block ed automatic download of this picture.

Color transform RGB->YCbCr
•General RBG -> YPbPr

•YPbPr -> YCbCr •ITU-R BT.601 Standard
K B = 0.114 , K R = 0.299

RGB → YCbCr Y = 0.3R + 0.6G + 0.1B

YCbCr → RGB R = Y + 1.4 ( Cr − 128 )

Cb = −0.2 R − 0.3G + 0.5 B + 128 G = Y − 0.3 ( Cb − 128 ) − 0.7 ( Cr − 128 ) Cr = 0.5 R −…...

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