COMP6021/COMP6023 Image Submampling

When an image is subsampled the missing pixels have to be accounted for by the receiver. This can be accomplished by increasing the size of the pixels that are present, or by interpolating the missing pixels. The different is illustrated in these images. You need to click on them to see them at full size.

COMP6021 Online Lesson - Digitization

We are currently considering how real world things are digitised. This video might be useful.

Digital Colour

This week in class we will be looking at how colour is represented digitally. This video explains the Hue Saturation Brightness (HSB) system.

This video outlines the Lab and CMYK systems.

COMP6023 Google Spam Detection: What is a "paid link"?

What's a "paid link"?

COMP6023 Google's Search Spam Dectection

Last week we spoke a little bit about Google's spam detection. Here are two interesting discussions about that work.

What's it like to fight web spam at Google?

COMP6023 DCOM1 Class 21

We looked at digitising grey scale images an looked at coding colour. I explained the HSB and RGB colour systems.

We will look at the Lab system in the next class.

COMP6023 DNET1/COM1c Class 21

We looked at digitising grey scale images an looked at coding colour. I explained the HSB, RGB, and Lab colour systems.

COMP6021 Online class: Image Digitization

COMP6021 Online Class: Subsampling & Interpolation

COMP6023 DCOM1A Timetable Change

COMP6023 Lab DCOM1A Monday 1600-1800 will be in C134x from now on. Students will discover Photoshop there.

COMP6023 DCOM1 Class 18

SEO
Analytics

COMP6021 Class 20

the one with the thermometers

We looked at Digitisation and saw how both the number of quantization levels and the sample rate can affect the fidelity of the digital representation of the analogue values.

COMP6023 Interesting Job Ad

http://www.irishtimes.com/jobs/featured-position-cpl/digital-marketing-manager-1.1705239

Note the requirement for SEO knowledge in this current job ad.

COMP6021 Class 19 Lab

Students saved GIFs with various settings for use in the assignment.

COMP6021 Class 18

the one with the LZW

We looked at Lempel-Ziv-Welch coding.


Students worked on an LZW exercise. The answer was Ando Masahashi

I did a Huffman coding question on the board from a past exam paper.

COMP6023 DOM1B Classes 19 & 20

Students worked on generating the GIF data required for Assignment 2.

COMP6023 ITM1 Classes 19 & 20

Students worked on Assignment 2 by saving the images as GIFs with different numbers of colours, with and without dithering.

COMP6023 DNET1 Classes 19 & 20

Students saved the GIF images they needed for Assessment 2.

COMP6021 Class 17

the one with the Huffman coding

We began our look at compression. We discussed lossy vs. lossless compression. we took a look at Run Length Encoding, Difference Coding, and Huffman Coding.

COMP6023 DWEB1/ITM1 Class 18

We looked some more at SEO and I showed students Google Analytics data from my blog.

(We got up to Slide 64)

[No recording of this class because I can't record classes back to back]