The next concept—scale, proportion, and quantity—concerns the sizes of things and the mathematical relationships among disparate elements.
Introduction Sharpness is arguably the most important photographic image quality factor because it determines the amount of detail an imaging system can reproduce. Sharpness is defined by the boundaries between zones of different tones or colors.
It is illustrated by the bar pattern of increasing spatial frequency, below. The top portion is sharp; its boundaries are crisp steps, not gradual. The bottom portion illustrates how the pattern is degraded after it passes through a lens.
All lenses, even the finest, blur images to some degree. Poor lenses blur images more than fine ones. Although rise distance is a good indicator of image sharpness, it has an important limitation. There is no simple way to calculate the rise distance of a complete imaging system from the rise distance of its components— from a lens, digital sensor, and software sharpening.
To get around this problem, measurements are made in frequency domain, where frequency is measured in cycles or line pairs per distance millimeters, inches, pixels, or image height. The image below is a sine wave— a pattern of pure tones— that varies from low to high spatial frequencies. The top portion is the original sine pattern.
The bottom portion illustrates lens degradation, which reduces pattern contrast at high spatial frequencies. It is the key to measuring sharpness. Sine and bar patterns, amplitude plot, and Contrast MTF plot The upper plot displays the sine pattern with lens blur the original bar pattern the bar pattern with lens blur Lens blur causes contrast to drop at high spatial frequencies.
Contrast decreases at high spatial frequencies. The modulation of the sine pattern which consists of pure frequencies is used to calculate MTF. The lower plot displays the corresponding sine pattern contrast, i. Amplitude is displayed on a linear scale.
Green is for geeks. Do you get excited by a good equation? Were you passionate about your college math classes? The text in green is for you. The primary Imatest MTF calculation is the slanted-edge, which uses a mathematical operation known as the Fourier transform.
The USAF chart is also poorly suited for computer analysis because it uses space inefficiently and the bar triplets lack a low frequency reference.
The eye is relatively insensitive to detail at spatial frequencies where MTF is low: See Slanted-edge versus Siemens Star for more detail. Origins of Imatest slanted-edge SFR calculations: The original Matlab code is available on http:Below you will find short definitions for many of the terms associated with medieval castles.
The list is by no means complete, and certain minor terms have been omitted. Home > Assignment Sample > Compare and contrast the explanations of social change of Karl Marx and Max Weber. Compare and contrast the explanations of social change of Karl Marx and Max Weber - Assignment Example Compare and contrast two sociological theories ;.
Feb 14, · compare vs contrast. Compare and contrast are words that are often used to talk about the similarities and differences between two things or objects. These two words are very commonly used. Compare means to see the similarity and contrast means to see the difference/5(6).
Write two to three sentences in which you compare and contrast the messages of the advertisement and the speech. include examples to support your explanation/5(10).
Comparing and Contrasting When students compare and contrast, they are finding similarities and differences in what they are reading.
Help students understand the concept of comparing and. Compare and contrast two theories of depression The biological and the cognitive explanations of depression both have strong support and offer plausible explanations for the onset and graduation of the disorder.