‘Resolution’ The word should be banned from vigilance.What all IP manufacturers want to say when they say ‘resolution’ is’ pixel count.We must be clear and precise, calling it pixel count – to avoid confusion and make unnecessary mistakes.( IPVM ).
Image resolution on CRT monitors
Image resolution describes the level of detail an image carries.The term also applies to digital images, film images and other types of images.Higher resolutions mean more detail in the image.
Image resolution can be measured in several ways. Basically, the resolution quantifies how close the lines can get to each other and still be visibly determined. Resolution units may be linked to physical sizes (for example, lines per millimeter, lines per inch, etc.) or the total size of a picture (lines by image height, also known simply as lines or television lines). In addition, pairs of rows are often used instead of individual rows. A pair of lines consists of an erased line and an adjacent line, while lines count both lines off and on. A resolution of ten lines per mm means five erased lines alternating with five lines lit, or five pairs of lines per mm. Resolution of photographic lenses and films are more often cited as pairs of lines per mm.
A TV or CRT monitor with 525 scan lines produces an image with slightly less than 525 lines of resolution television.The relationship between the lines of resolution and the number of lines of format is known as Factor Kell, in honor of Raymond D. Kell, who elaborated the details of the visual resolution in scanning systems in the RCA in the 1930s.
Resolution in pixels
The term resolution is often used as a
pixel count in digital images, although US, Japanese and international standards specify that this should not be used, at least in the field of digital cameras.An image of N pixels high by N pixels wide can have any resolution lower than N lines of image height or N TV lines.But when the pixel count is referenced as resolution, the convention is to describe the resolution in pixels as the set of two positive integers, where the first number is the number of columns (width) of pixels and the second is the number of pixels lines (height) of pixels;something like 640 X 480, for example.
Another popular convention is to cite the resolution as the total amount of pixels in the image, typically reported as the number of megapixels , which can be calculated by multiplying the columns of pixels by the lines of pixels and dividing the result by one million.Other conventions include describing pixels per unit length or pixels per unit area, such as pixels per inch or per square inch.None of these resolutions in pixels are resolutions of truth, but they are widely cited as such;serve as the upper limit in image resolution.
Below is an illustration of how the same image can appear at different pixel resolutions if the pixels are poorly rendered as squares.Usually a smooth reconstruction of the image from the pixels would be preferable, but for didactic effect, the squares better illustrate the situation.