File Compression 3.3.

Slides:

Advertisements

Similar presentations

GCSE Computing#BristolMet Session Objectives#10 MUST define the term sample rate COULD explain how sound can be sampled and stored in digital form SHOULD.

Advertisements

Bitmapped Graphic Data

ISYS 3074 Graphics File Formats File formats have developed with applications. At least 50 currently in use. Examples include: GIF, JPEG, TIFF, BMP, DIB,

I Power Multimedia Technology Video Data. Video data Video is a sequence of individual pictures or frames, taken one after another. These are played back.

Comparison of image compression algorithms ECE-533 Paula Aguilera.

Computer Systems Nat 4.5 Computing Science Data Representation Lesson 4: Storing Graphics EXTENSION.

Image Storage Bitmapped Graphics – in which an image is represented as a collection of dots Vector Graphics – in which an image is represented as a set.

Data Representation The method of data representation in a computer system depends upon the type of data which is being used. Three types of data are considered.

Bit-Mapped Graphic Data: Input (Capture) Hardware Multimedia – Section 2.

Common file formats  Lesson Objective: Understanding common file formats and their differences.  Learning Outcome:  Describe the type of files which.

Image Representation. Objectives  Bitmaps: resolution, colour depth and simple bitmap file calculations.  Vector graphics: drawing list – objects and.

Digital imaging. Two types of graphic Bitmap Vector.

Still-image compression Moving-image compression and File types.

Image formats. Basic terminologies… Pixels: Pixels are the building blocks of every digital image. a pixel is a single point in a graphic image. Resolutions:

Image File Types Module 4: Working with Images LESSON 5.

Marr CollegeHigher ComputingSlide 1 Higher Computing: COMPUTER SYSTEMS Part 1: Data Representation – 6 hours.

Web Graphics By Chris Harding. Contents  Software  Vector Graphics and Pixel Based  Transparent Images  Compression  GIF vs. JPEG  Animated GIF.

Graphics An image is made up of tiny dots called pixels (“picture elements”) The resolution determines the.

Computer Systems Nat 4.5 Computing Science Data Representation Lesson 4: Representing and Storing Graphics EXTENSION.

Media Types Information Systems can contain the following types of media: Sound, graphics, video & text.

POWERPOINT PLUS 11/17/07 Class Notes. WHAT IS A PIXEL A pixel is a number that represents the intensity of light at a square spot in the picture. Pixels.

Comp 335 File Structures Data Compression. Why Study Data Compression? Conserves storage space Files can be transmitted faster because there are less.

Audio Streaming © Nanda Ganesan, Ph.D.. Audio File Features Audio file is a record of captured sound that can be played back –The WAV File is an example.

Digital File Formats By Ali Aslam. JPEG JPEG Stands for Joint Photographic Experts Group. JPEG uses a lossy compression routine. Lossy compression means.

Digital Graphics for Computer Games Pixels Types of Digital Graphics (Raster and Vector) Compression.

Image File Formats By Dr. Rajeev Srivastava 1. Image File Formats Header and Image data. A typical image file format contains two fields namely Dr. Rajeev.

Image File Formats Harrow Computer Club – Wed, 1 Dec 2010 Bob Watson MA CMath MIMA MBCS.

Information Systems Design and Development Media Types Computing Science.

Computer Sciences Department1. 2 Data Compression and techniques.

Computer Graphics Lesson 2 July 12, 2005 Image Formats What are some formats you are familiar with? There are 4 basic image format types: Uncompressed.

Software Design and Development Storing Data Part 2 Text, sound and video Computing Science.

FILE COMPRESSION Lossy vs Lossless. Why compress a file? To save storage space. To speed up data transmission.

ITEC2110, Digital Media Chapter 2 Fundamentals of Digital Imaging 1 GGC -- ITEC Digital Media.

Computer Systems Nat 5 Computing Science Data Representation

Lesson Objectives Aims You should be able to:

Component 1.9 Security and Data Management

Common Bitmap Image File Types

GCSE COMPUTER SCIENCE Topic 3 - Data 3.3 Data Storage and Compression.

File Compression 3.3.

Denary to Binary Numbers & Binary to Denary

3.3 Fundamentals of data representation

Computer Science Higher

Data Compression.

Lesson Objectives Aims You should know about: 1.3.1:

Graphics Bitmap Vector

Unit 2- Lesson 1 & 2- Bytes and File Sizes / Text Compression

Digital Media Lecture 4.1: Image Encoding Practice

Multimedia: Digitised Sound Data

Raster Images CPSC 1030.

Data Compression.

File Compression-overview

Lossy vs Lossless compression

File size and image quality

Digital imaging.

1.01 Investigate graphic types and file formats.

Images in Binary.

Representing Images 2.6 – Data Representation.

Web Design and Development

Data Compression.

Topic 3: Data Compression.

1. Explain how ASCII is used to represent text in a computer system

Data compression Why compress (or ‘zip’)? Lossy vs. lossless

ИНФОРМАТИКА И РАЧУНАРСТВО Наставна тема: РАЧУНАРСКА ГРАФИКА

Computer Systems – Unit 1

Creative Media Pre-production Introduction Creative Media GCSE

COMS 161 Introduction to Computing

Do Now! Convert the following sequence of bits into an image using the protocol we discussed (first 8 bits are lengthxwidth, Then fill in the rows pixel.

Computer Systems Nat 4.5 Computing Science Data Representation

GCSE COMPUTER SCIENCE Topic 3 - Data 3.9 Data Compression.

Creating Digital Graphics

Presentation transcript:

File Compression 3.3

Learning Objectives 3.3.2 Understand the need for data compression and methods of compressing data [lossless, lossy] and that JPEG and MP3 are examples of lossy algorithms 3.3.3 Understand how a lossless, run-length encoding [RLE] algorithm works 3.3.4 Understand that file storage is measured in bytes and that data transmission is measured in bits per seconds, and be able to calculate the time required to transmit a file and storage requirements for files

Transfer Rate Why compress data? If you have 10 high quality images at 4Mb’s each. How much storage will it take up? What if you were to transfer this data across the internet, how would you calculate the transfer rate, what is it measured in? Transfer rate (Mbps) = Number of files * file size / time taken * 8

What do we already know? What is colour depth? How many colours can be represented using 4 bits? What are the differences between bitmap images and vector images?

Answer the following in a word.doc Use BBC Bitesize to help you: Google bbc bitesize compression Why compress an image? What are 2 compression methods? What are at least 3 advantages and disadvantages of these 2 compression methods?

Understanding Images Music http://www.bbc.co.uk/education/guides/zqyrq6f/revision/4 Images Music Lossless Lossless PNG WAV Lossy Lossy JPEG MP3 GIF AAC

Lossless Algorithm A A B A A A 2B2 2B3 2B1 2 1 2B

Run Length Encoding 3 bananas 2 Strawberries 1 banana 1 pineapple 3B, 2S, 1P, 1B

Activity 1, 3, 1 4, 1

Explanation https://www.youtube.com/watch?v=Lto-ajuqW3w 2:30-6:43 http://www.bbc.co.uk/education/guides/zqyrq6f/revision/4

Plenary Why compress images? What are the two main ways to compress images? Name some of the differences Outline the RLE algorithm What compression method would you use when uploading an image to Facebook?