What is the pixel space frequency of photographic equipment?

The next pixel of the digital camera is 1 cycle/pixel, two pixels are 0.5 cycles/pixel, and four pixels are 0.25 cycles/pixel.

What is spatial frequency?

The general frequency in our daily life refers to the time frequency, its unit is Hz, and its definition is the number of (s) movements per unit time.

[Official definition: 1. The number of times or weeks of vibration or oscillation per unit time; 2. The number of times something happens or a process is completed in a certain period of time] The dividend here is the unit, so it is the time frequency.

But what if we change the unit of dividend into the space unit millimeter? Is the number of times something appears in a unit millisecond. Here we call it spatial frequency. [Official statement: But the expression of spatial frequency is used to "line pairs per millimeter". (lp/mm), that is, how many line pairs are in the width of each millimeter], [These can also be used to express: and the units of spatial frequency are generally: 1, line pairs per millimeter (LP/mm), 2, cycles per millimeter (mm), 3, cycles per pixel (pixels), 4, and each picture.

Among them, lp/mm is the most used unit at present. Cycles/pixel is an imaging system in digital cameras. The next pixel of the digital camera is 1 cycle/pixel, two pixels are 0.5 cycles/pixel, and four pixels are 0.25 cycles/pixel.