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.