Chapter 2 Fundamentals of Digital Imaging 1
Pixels • Each peg hole on the pegboard is a sample point . • The sample points are discrete . • In digital imaging, each of these discrete sample points is called a pic ture el ement , or pixel for short. 2
Sampling Rate • Refers to how frequent you take a sample • For an image, sampling frequency refers to how close neighboring samples are in a 2-D image plane. • For example, when we change the grid from 25 20 to 100 80, we say that we increase the sampling rate. – You are sampling more frequently within the same spatial distance. 3
Resolution • In digital imaging, increasing the sampling rate is equivalent to increasing the image resolution. 4
Consequences of Higher Resolution With higher resolution, • You have more sample points (pixels) to represent the same scene, i.e., the pixel dimensions of the captured image are increased. • The file size of the digitized image is larger . • You gain more detail from the original scene.
- Summer '20
- Computer Graphics, Pixel