2a_Digital Imaging.ppt - Chapter 2 Fundamentals of Digital Imaging 1 Pixels \u2022 Each peg hole on the pegboard is a sample point \u2022 The sample points

2a_Digital Imaging.ppt - Chapter 2 Fundamentals of Digital...

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Chapter 2 Fundamentals of Digital Imaging 1
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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
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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
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Resolution In digital imaging, increasing the sampling rate is equivalent to increasing the image resolution. 4
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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.
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