01:198:170 Lecture Notes - Lecture 3: Binary Number, Extended Ascii, Pixelation

• School: Rutgers University
• Department: Computer Science
• Course: 01:198:170
• Professor: Stephen Stoll

Document Summary

To convert info, we need to convert everything into 0s & 1s. Panda representation: presence & absence or panda: is the data present or is it not? zero = not present; 1 = present, such a formulation = discrete. Discrete means the number is either there or not there. Computers use base-2 to represent numbers using binary number system: limited to using only 0 and 1. Hex digits, short for hexadecimal digits, are base-16 numbers: we convert long strings of 0s & 1s into four-bit groups (easier to write & simpler) Ascii = american standard code for info interchange. Unicode = 256 extended ascii codes cover most western languages: computers all over the world can communicate/interact w/ each other. Everything is transformed from a letter/text to a binary unique code: ie: hello example. We can digitize everything (books, pictures, movies, music: by taking 0s and 1s, we end up with a bigger picture. Ie: 0 = absence of color (black)