Network cameras: What are the differences between 720P, 960P, 1080P and 4K?

Among high-definition network cameras, we usually call them megapixel or two-megapixel cameras. We often hear customers say that there are 720P, 960P, 1080P, and 4K in network cameras. So 720P, 960P and What do 1080P and 4K mean? 720p, 960p, 1080p and 4K refer to the highest resolution of the output surveillance image. What is the difference between them? Let's introduce it from Laian Intelligent System Development Co., Ltd.:

Let's calculate their highest resolution:

1. 720p

720P actually refers to the resolution of 1280 720 pixels - calculated as 1280 720 = 921600 pixels, 720p or 720i is a megapixel resolution, which is what we call a million network cameras.

2. 960p

960P actually refers to the resolution of 1280 960 pixels - if you calculate it, it is 1280 960 = 1228800 pixels. Everyone usually calls it 960p or The 960i has a resolution of 1.3 million pixels, which is what we call a 1.3 million pixel camera.

3. 1080p

1080P actually refers to the resolution of 1920 1080 pixels - if you calculate it, it is 1920 1080 = 2073600 pixels. Everyone usually calls it 1080p Or 1080i is a 2-megapixel resolution, which is what we call a 2-megapixel camera.

4. 4K

4K refers to the resolution of 3840 horizontal 2160 vertical (16:9) pixels, supporting 120p, 60p, 59.94p, 50p, 30p, 29.97p, 25p, 24p and 23.976p, 9 frame rates.

The difference between 720P, 960P, 1080P and 4K

“P”

p means Progressive, line by line. 720P, 1080P, etc., represent the "total number of lines of video pixels". For example, 720P means that the video has 720 lines of pixels, and 1080P means that the video has a total of 1080 lines of pixels. A camera with 1080P resolution usually has the number of pixels. It's 1920 1080. "P" itself stands for "progressive scan", which is the abbreviation of Progressive, as opposed to interlaced.

"K"

2K, 4K, etc., represent the "total number of columns of video pixels", such as 4K, which represents the video has 4000 Number of column pixels, specifically 3840 or 4096 columns. A 4K resolution camera usually has 3840 2160 pixels or 4096 2160 pixels.

“MP”

MP is the total number of pixels, which is the result of multiplying the number of rows (P) and the number of columns (K) of pixels (million pixels). For example, a 1080P camera multiplies 1920 pixels and 1080 pixels to get a total number of pixels of 2MP (megapixels).

For cameras with the same configuration, the higher the pixels, the higher the resolution, and the higher the bandwidth occupied when using wireless bridge transmission. So for 720P, 960P, 1080P, and 4K, let’s analyze the bandwidth occupied when using wireless bridges to transmit signals:

At present, high-definition network cameras are generally 720p, 960P, 1080P, and 4K

1. Generally, the default image code stream for each channel of 720P is 3M;

2. The default image code stream for each channel of 960P is 4M;

3. The default image code stream of each channel for 1080P The code stream is 5M;

4. The default image code stream for each channel of 4K is more than 8M.

However, you can adjust this code stream according to the image quality you need. Generally, it will have little impact on image quality and clarity.

720P is a display format that reaches a resolution of 1280 720 under progressive scanning; and by analogy, 960P is a display format that reaches a resolution of 1280 960 under progressive scanning; 1080P is a display format that reaches a resolution of 1280 960 under progressive scanning. A display format that reaches a resolution of 1920 1080 under progressive scanning; 4K is a display format that reaches a resolution of 3840 2160 under progressive scanning (you may also hear that there is 1080i, the i stands for interlace, which means interlaced, the same It is a scanning frequency, and progressive images are more stable, flicker-free, and have better effects than interlaced images. In fact, after 1080i conversion, the effect is only equivalent to 540P).

Differences from SD, HD, Full HD and Ultra HD

(1) High Definition (High Definition) is the one we are relatively familiar with at present. words. High definition was first proposed in the field of radio and television. Relevant standards were first formulated by authoritative organizations such as the Society of Motion Picture and Television Engineers (SMPTE). Radio and television standards are also widely used in the video surveillance field. "High definition" is defined as three standard forms: 720p, 1080i and 1080p, and 1080P has another name - Full High Definition (Full High Definition).

Regarding high-definition standards, there are two internationally recognized standards: video vertical resolution exceeds 720p or 1080i; video aspect ratio is 16:9.

(2) Standard Definition is a video format with a physical resolution below 720p.

(3) Ultra High-Definition, this is our focus today. The latest information approved by the International Telecommunication Union (International Telecommunication Union) shows that the official name of "4K" resolution (3840 2160 pixels) is "Ultra High-Definition" )". At the same time, this name also applies to the "8K" resolution (7680 4320 pixels)".

CEA requires that all consumer monitors and TVs must meet the following conditions before they can be labeled as "Ultra HD": First, the smallest pixel on the screen must reach 8 million effective pixels ( 3840 2160), without changing the screen resolution, at least one transmission end can transmit 4K video. The display of 4K content must be native, not upconverted, and the aspect ratio must be at least 16:9.

Ps:

720p format, resolution 1280 720p/60Hz, line frequency 45kHz.

4K resolution is 4 times that of 1080p 3840 2160 = 1920 2 1080 2

8K resolution is 4 times 4K 7680 4320 = 3840 2 2160 2

When purchasing a network camera, we will encounter a lot of confusing parameters. It is difficult to tell what 720P, 960P, 1080P, and 4K mean, and what are the differences between them. The P in 1080P and 1080i refers to Progressive Scan, and the i refers to InterIace Scan.

In the past, big-ass CRT TVs used electron beams to scan the screen line by line and then emit light to display images. Since image signals are limited by bandwidth during transmission, only interlaced signals can be transmitted to save bandwidth.

So when working, a 525-line image will be divided into two fields for scanning. The first field will scan odd-numbered lines, and the second field will scan even-numbered lines. The original frame will be completed through two fields of scanning. The number of lines to scan through the image. Due to the persistence of vision effect of the human eye, a complete image is still visible to the human eye after rapid scanning.

When CRT displays 1280*720 images, it uses progressive scanning, which is called 720P. When it displays 1920*1080 images, it uses interlaced scanning, which is called 1080i. According to the technology at the time, it was not possible to produce 1080P TVs. Nowadays, the big-ass CRT has been eliminated and replaced by LCD TV, which is a fixed-pixel display device. There is no need to scan when displaying images, and each pixel can emit light at the same time. Why haven't 720p, 720i, 960p, 960i, 1080p, and 1080i been cancelled?

Because of the existence of cameras, although today's cameras are digital, the scanning method is inherited from the traditional interlaced analog camera. While retaining the two interlaced scanning methods, it also adds progressive scanning. way. And it also retains the relationship between PAL system (50Hz frequency) and NTSC system (60Hz frequency) pixels and image resolution

If you use a magnifying glass to enlarge each picture, you will find that it is composed of many pixels. It is composed of color points, and each color point is called a pixel.

Usually when we talk about 100W, 200W, and 400W pixel cameras, we refer to the number of pixels of its corresponding photoreceptor assembly.

Resolution refers to the number of pixels expressed or intercepted per unit length.

Usually what we call camera resolution refers to the image resolution, that is, the number of pixels per inch of the image, represented by PPI. The higher the resolution of the image, the higher the pixel density and the clearer the image.

Pixel (Pixel) = size (Inch) * resolution (PPI). In layman's terms, the more pixels per unit area, the higher the resolution, and the picture will look clearer. This is why the larger the size of the same picture, the blurr the picture.

And if the screen is the same size, playing 1080P videos and images will definitely be clearer than 720P, and the picture will be more delicate.

After reading the above, it is too literary. The main difference between 720P...4K is the resolution. If you analyze the screenshots, it is the difference in the number of pixels used in the same picture. It is usually said that the higher the resolution, the better. clear. But it also has to do with the lens.

1. 720p is 1280*720=921600 pixels, 720p or 720i is megapixel resolution, which is what we call a million network cameras;

2. 960p is 1280*960=1228800 pixels. We usually call 960p or 960i as 1.3 million pixel resolution, which is what we call a 1.3 million pixel camera;

3. 1080p is 1920*1080=2073600 pixels , everyone generally calls 1080p or 1080i a resolution of 2 million pixels, which is what we call a 2 million pixel camera.

For cameras with the same configuration, the higher the pixels, the higher the resolution