Modeling Images

In this Pull-Out, students learn how images can be digitalized and then compressed to reduce storage space. In Activity 1, students represent digital images with matrices and convert matrix representations into images. Binary numbers are introduced so that students can determine the number of tones that can be represented using various pixel bit depths. In Activity 2, students use matrix addition and subtraction to change the brightness of an image and to create a negative image. Scalar multiplication is used to increase or decrease the contrast of an image. Activity 3 focuses on the file size needed to store a digital image and introduces the Haar wavelet transform for compressing digital images.