This “highest” resolution appears to be the highest good. But high-definition television or HD video came to us relatively recently, so they have not yet had time to demand replacement in accordance with the technology update.
Naturally, with a sometimes rather insignificant difference in price, for example, for FullHD and HD ready TVs, the consumer wants to know exactly what he is buying and whether he made a mistake in his choice. The displayed pictures do not always make it possible to determine: the image quality depends not only on the resolution, but also on many other factors (brightness, contrast, viewing angles of the screen, etc.), and subjective opinion is again marking time. Let's see what is the difference between the main baits of television and video equipment - FullHD and HD resolutions.
HD Resolution Standard(High Definition) includes any resolution that exceeds the standard format (i.e. 720x576). Today, HD resolution (HD ready) means the minimum requirements for a resolution of 1280x720, but less common resolutions, for example, 1920x1440, are also referred to the high-definition standard. Marketing also introduces the HD ready designation to denote matrices capable of displaying the HD standard on a par with standard definition.
In fact, Full HD- This is HD with a resolution of 1920 × 1080, that is, higher than that of HD.
The Full HD naming is not a quality standard - it is a marketing tag designed to attract shoppers and keep them from getting confused by the digital values of the resolutions. There is a standard HD ready 1080p, corresponding to a resolution of 1920 × 1080, but not equivalent to Full HD: often video equipment technically does not correspond to the mentioned standard, being limited to compliance with the resolution. HD ready, on the other hand, is a standardized designation for receivers.
For the consumer, the difference between Full HD and HD is in the picture quality. High definition is due to the increase in detail by increasing the number of pixels of the screen matrix. Accordingly, the image Full format HD contains more information than HD or standard definition images. According to experts, the difference in the amount of information can reach fourfold.
Also, matrixes of Full HD displays are capable of displaying both a picture with a resolution of 1920 × 1080 and 1920 × 720, and a standard 720 × 576, while HD ready does not swing at a higher resolution. This does not mean that when playing a video of a different format, we will get a TV grid or "snow". HD displays increase the standard video resolution to the resolution of the installed matrix, the HD720 picture is displayed unchanged, and the HD1080 is reduced - again, to the physical capabilities of the matrix. Full HD-displays any resolution below 1920х1080 "hold out" to their own matrix. As a rule, large screens involve the reproduction of media content, so the picture quality will be of fundamental importance, and the choice remains with Full HD.
When it comes to scanning, HD means extremely progressive, although with a little distortion, such devices can reproduce 1080i (interlaced). FullHD assumes both interlaced and progressive scanning. This compromise makes it possible to receive a signal, for example, from a satellite without problems with data flow and channel capacity.
Today, the price range of television and video equipment has a very wide spread, so there is no need to talk about a clear advantage in the cost of one or another class of devices. However, in addition to Full HD matrices, most manufacturers install powerful processors that can process images quickly, so if the diagonals are equal, such models can be significantly more expensive. Another important point: Full HD is not equal to HD1080p, so TV and monitor models that technically do not meet the quality standard can be labeled Full HD (without deceiving potential buyers), but such devices are much cheaper than those labeled HD1080p.
Manufacturers often equip Full HD devices with powerful processors, which affects functionality and performance.
All picture formats with a resolution from 1280x720 are considered high definition (HD) format. In the modern world of video surveillance, there are two directions: analog and digital. Accordingly, there are analog and network (IP) HD cameras. 960H (NTSC: 960x480) resolution is not HD. Current HD resolution formats include: 1.0 Megapixel (720p), 1.3 Megapixel (960p), 2 Megapixel (1080p), 3 Megapixel, 5 Megapixel, 8 Megapixel (4K UHD), 12 Megapixel, 33 Megapixel (8K UHD) ...
Typically, HD network cameras provide slightly better image quality than analog HD cameras of the same resolution (eg 720p).
Recently, one of our clients reported that they installed a video surveillance system on 720p AHD cameras (the manufacturer said 1000TVL) and was not satisfied: the image quality of these 720p AHD cameras was even worse than that of the old 960H cameras. Why this happened, we will tell in the fourth part of the article.
Compared to standard definition, HD technology has increased picture detail. Image quality is further enhanced by various enhancement technologies such as progressive scan, 2D / 3D dynamic noise reduction, wide dynamic range (WDR), etc. In short, HD delivers superb picture quality. A typical analog 960H camera gives a resolution of 960H / WD1, which is 960x480 pixels (for NTSC) or 960x576 pixels (for PAL). After the signal is digitized in the DVR or HVR, the image will be a maximum of 552960 pixels (0.5 megapixel).
A high definition camera can cover a much wider area than a conventional camera. Take, for example, a 12-megapixel panoramic camera with a fisheye lens and a 360-degree field of view. With a built-in 12MP image sensor and ePTZ (virtual pan / tilt / zoom) and split image capabilities, it can replace multiple conventional CCTV cameras at once, significantly reducing installation costs and subsequent maintenance fees.
Excellent compatibility is another advantage of HD. Whether you shop online or go to your local electronics store, you will notice that all TVs, camcorders and digital cameras support HD 1080p (FullHD). Accordingly, if you want this equipment to work with your CCTV system, you should choose a CCTV system that supports 1080p. We also understand that 4K is the current trend, it is logical to expect 4K UHD video surveillance system to become popular in the future.
High definition IP cameras are at the forefront of video surveillance systems. They can provide higher quality video with greater image detail and wider coverage than standard definition cameras. You can select the desired format of network (IP) cameras according to your requirements. For example, for face or license plate recognition applications, choose megapixel network cameras with a resolution of 1080p or more. To find out the resolution of a particular HD format, refer to the following table:
| Format | Resolution (pixels) | Aspect ratio | Scan |
| 1MP / 720P | 1280x720 | 16:9 | Progressive |
| SXGA / 960P | 1280x960 | 4:3 | Progressive |
| 1.3MP | 1280x1024 | 5:4 | Progressive |
| 2MP / 1080P | 1920x1080 | 16:9 | Progressive |
| 2.3MP | 1920x1200 | 16:10 | Progressive |
| 3MP | 2048x1536 | 4:3 | Progressive |
| 4MP | 2592x1520 | 16:9 | Progressive |
| 5MP | 2560x1960 | 4:3 | Progressive |
| 6MP | 3072x2048 | 3:2 | Progressive |
| 4K Ultra HD | 3840x2160 | 16:9 | Progressive |
| 8K Ultra HD | 7680x4320 | 16:9 | Progressive |
Besides image resolution, what else should you consider when choosing HD network cameras? Here we will share information on how to choose the right HD cameras from the installer's point of view.
As you know, a CCTV camera works differently from a household camera - a CCTV camera cannot use a flash when capturing an image / video. If the camera has poor low-light performance, its use is limited. In low light conditions such a camera "fades", despite its very high resolution.
High resolution is a double-edged sword: the sensor manufacturer does not have the ability to infinitely increase the die area, therefore, the increase in resolution is associated with a decrease in the size of the pixel itself with the same sensor die size (usually 1/3 ""), so there is less light per pixel , which leads to a decrease in sensitivity with increasing resolution (megapixels).
Currently, the optimal value for most areas of video surveillance is 2MP resolution (1080p / FullHD), it is for this resolution that most sensors from the Low Illumination series exist.
All network (IP) CCTV cameras have some latency compared to real time, and the cost or quality of the camera is not a determining factor in this latency. For example, for the same 720p image, the video delay time for some cameras is 0.1 s, while for some other network cameras this time can be 0.4 s, or even more than 0.7 s. Why is the video delay time different? Unlike an analog camera, a network camera compresses video (a process called encoding), and user devices decode the video for display, resulting in video lag. Generally, the lower the latency, the better the image processor's capabilities. This means choosing the network camera with the lowest video latency.
When the CCTV camera is in operation, it generates heat, especially when the infrared light turns on at night. This rule is true for any CCTV camera. Excessive heat generation increases the likelihood of overheating and, consequently, damage to the camera. When choosing megapixel cameras, pay attention to:
Choose a camera with lower power consumption. Low power consumption means the camera saves energy and generates less heat. The downside: in winter, a camera with low heat emission may freeze (usually it concerns the IR filter), and also low consumption means that a weak IR illumination is installed, this should also be taken into account.
Consider using a camera with improved performance in low light conditions (no infrared lighting or other artificial lighting). Such a camera in low light conditions can capture images even in the dark (> 0.009 - 0.001 lux).
Choose a camera with good heat dissipation. A metal case is preferable to a plastic one. To ensure reliable performance, the Elite Series Network Cameras use a finned heat sink on the chassis to maximize heat dissipation, greatly helping the camera to ensure reliable performance.
"" High price = high quality "" - in most cases this rule is true. Based on research reports, it can be said that a consumer often believes that a higher price of a product indicates a higher level of quality. But price is not the only indicator. good quality especially when purchasing "Made in China" products. I have been in the video surveillance industry for over five years and can claim that end users, integrators and installers can get high quality products from Chinese suppliers / manufacturers at a very competitive price. High-end cameras can have unique body designs and special features not found in other products.
In conclusion, I would like to say that network cameras should also have good technical support. Despite the fact that IP cameras are becoming more and more simple to set up and operate, end users may encounter technical problems that require third-party assistance. Faced with such a problem, you will receive technical support from us within 1-2 days, this is quite acceptable. It is because of this that I personally do not advise buying CCTV cameras on Aliexpress, since in the future you are unlikely to receive technical support from sellers and operational support.
| Device type | TVL / Megapixels | Final NTSC Resolution | Final PAL Resolution | Megapixels NTSC | Megapixels PAL |
| Analog matrices SONY CCD | 480TVL | 510H * 492V | 500H * 582V | ≈0.25 Megapixels | ≈0.29 Megapixels |
| 600TVL | 768*494 | 752*582 | ≈0.38 megapixels | ≈0.43 megapixels | |
| 700TVL | 976*494 | 976*582 | ≈0.48 megapixels | ≈0.56 Megapixels | |
| Analog matrices SONY CMOS | 1000TVL | 1280*720 | ≈0.92 Megapixels | ||
| IP cameras and IP recorders | 720P | 1280*720 | ≈0.92 Megapixels | ||
| 960P | 1280*960 | ≈1.23 Megapixels | |||
| 1080P | 1920*1080 | ≈2.07 Megapixels | |||
| 3MP | 2048 × 1536 | ≈3.14 Megapixels | |||
| 5MP | 2592 × 1920 | ≈4.97 Megapixels | |||
| Analog recorders | QCIF | 176*144 | ≈0.026 megapixels | ||
| CIF | 352*288 | ≈0.1 Megapixels | |||
| HD1 | 576*288 | ≈0.16 Megapixels | |||
| D1 (FCIF) | 704*576 | ≈0.4 Megapixels | |||
| 960H | 928*576 | ≈0.53 Megapixels | |||
| Format name | Number of dots displayed on the monitor | Image aspect ratio | Image size | |
|---|---|---|---|---|
| QVGA | 320 × 240 | 4:3 | 76.8 kpix | |
| SIF (MPEG1 SIF) | 352 × 240 | 22:15 | 84.48 kpix | |
| CIF (MPEG1 VideoCD) | 352 × 288 | 11:9 | 101.37 kpix | |
| WQVGA | 400 × 240 | 5:3 | 96 kpix | |
| 480 × 576 | 5:6 | 276.48 kpix | ||
| HVGA | 640 × 240 | 8:3 | 153.6 kpix | |
| HVGA | 320 × 480 | 2:3 | 153.6 kpix | |
| nHD | 640 × 360 | 16:9 | 230.4 kpix | |
| VGA | 640 × 480 | 4:3 | 307.2 kpix | |
| WVGA | 800 × 480 | 5:3 | 384 kpix | |
| SVGA | 800 × 600 | 4:3 | 480 kpix | |
| FWVGA | 848 × 480 | 16:9 | 409.92 kpix | |
| qHD | 960 × 540 | 16:9 | 518.4 kpix | |
| WSVGA | 1024 × 600 | 128:75 | 614.4 kpix | |
| XGA | 1024 × 768 | 4:3 | 786,432 kpix | |
| XGA + | 1152 × 864 | 4:3 | 995.3 kpix | |
| WXVGA | 1200 × 600 | 2:1 | 720 kpix | |
| HD 720p | 1280 × 720 | 16:9 | 921.6 kpix | |
| WXGA | 1280 × 768 | 5:3 | 983.04 kpix | |
| SXGA | 1280 × 1024 | 5:4 | 1.31 megapixels | |
| WXGA + | 1440 × 900 | 8:5 | 1.296 megapixels | |
| SXGA + | 1400 × 1050 | 4:3 | 1.47 megapixels | |
| XJXGA | 1536 × 960 | 8:5 | 1,475 megapixels | |
| WSXGA (?) | 1536 × 1024 | 3:2 | 1.57 megapixels | |
| WXGA ++ | 1600 × 900 | 16:9 | 1.44 megapixels | |
| WSXGA | 1600 × 1024 | 25:16 | 1.64 megapixels | |
| UXGA | 1600 × 1200 | 4:3 | 1.92 megapixels | |
| WSXGA + | 1680 × 1050 | 8:5 | 1.76 megapixels | |
| Full HD 1080p | 1920 × 1080 | 16:9 | 2.07 megapixels | |
| WUXGA | 1920 × 1200 | 8:5 | 2.3 megapixels | |
| 2K | 2048 × 1080 | 256:135 | 2.2 megapixels | |
| QWXGA | 2048 × 1152 | 16:9 | 2.36 megapixels | |
| QXGA | 2048 × 1536 | 4:3 | 3.15 megapixels | |
| WQXGA / Quad HD 1440p | 2560 × 1440 | 16:9 | 3.68 megapixels | |
| WQXGA | 2560 × 1600 | 8:5 | 4.09 megapixels | |
| QSXGA | 2560 × 2048 | 5:4 | 5.24 megapixels | |
| 3K | 3072 × 1620 | 256:135 | 4.97 megapixels | |
| WQXGA | 3200 × 1800 | 16:9 | 5.76 megapixels | |
| WQSXGA | 3200 × 2048 | 25:16 | 6.55 megapixels | |
| QUXGA | 3200 × 2400 | 4:3 | 7.68 megapixels | |
| QHD | 3440 × 1440 | 43:18 | 4.95 megapixels | |
| WQUXGA | 3840 × 2400 | 8:5 | 9.2 megapixels | |
| UHD | 5120 × 2700 | 256:135 | 13.82 megapixels | |
| 5120 × 2880 | 16:9 | 14.74 megapixels | ||
| 5120 × 3840 | 4:3 | 19.66 megapixels | ||
| HSXGA | 5120 × 4096 | 5:4 | 20.97 megapixels | |
| 6K UHD | 6144 × 3240 | 256:135 | 19.90 megapixels | |
| WHSXGA | 6400 × 4096 | 25:16 | 26.2 megapixels | |
| HUXGA | 6400 × 4800 | 4:3 | 30.72 megapixels | |
| 7K UHD | 7168 × 3780 | 256:135 | 8:5 | 36.86 megapixels |
| UHD | 8192 × 4320 | 256:135 | 35.2 megapixels |
To reduce the amount of stored video information in DVRs, various compression algorithms are used.
The main advantage of the H.264 algorithm is interframe compression, in which for each next frame its differences from the previous one are determined, and only these differences are saved in the archive after compression. During the operation of the algorithm, key frames (I-frames), which are a compressed complete image, are periodically saved in the archive, and then only changes, called intermediate frames (P- and B-frames), are saved for 25-100 frames. This method of compression allows you to obtain high quality images in a small volume, but requires more computations than compression in the MJPEG standard.
When using the MJPEG algorithm, each frame is subjected to compression, regardless of whether it differs from the previous one. Therefore, the only way to reduce the amount of stored data is to increase the compression and thereby reduce the recording quality. This method is used only in simple standalone DVRs that do not require long-term storage of information.
Another advantage of the H264 algorithm is its ability to operate in a constant bit rate (CBR) mode, in which the compression ratio of video information changes dynamically and thus the volume of the created archive is clearly fixed in one second. This feature of the algorithm makes it possible to unambiguously determine the maximum archive size per hour of continuous system operation, as well as the required network traffic for remote access.
Today I would like to touch upon the difference between images from different cameras. In fact, this question about the difference in images from cameras with different resolutions is probably the most frequent question in the field of video surveillance. Very often clients of our company ask what is the difference between FULL HD and HD resolution or the difference between 720p and 1080p. Nowadays TVs with 4K resolution are gaining popularity, along with this people are increasingly asking questions about this resolution. We have already discussed the difference between a 2 mpx camera and a 5 mpx camera on. Now we will consider an image captured from a camera with 4k (in this case 12 mpx) resolution and, for example, overlay the size of pictures with a different resolution on it. As a result, we will get a visual schematic picture.
Of course, according to the results obtained, it will not be possible to judge the real viewing angles of the camera, since the camera lens is also responsible for the viewing angle. You cannot judge the quality of the picture either, since there are even more factors here. But you can get a rough idea of the difference between different resolutions.
And so let's start listing the permissions from small to large:
CIF is a video format from the era of MPEG (not to be confused with MPEG4) and VideoCD. At one time, its purpose was to convert the PAL and NTSC standards, the resolution is 352x288 - which is approximately 0.1 mpx.
D1 is another video format from a bygone era. This format corresponded to the picture quality roughly comparable to the first video recorders. Used extensively on analog CCTV cameras in the 2000s. Resolution 720x480.
960H - the video format that replaced the D1, was once positioned as an alternative to HD resolution, but this is not at all the case, it did not reach it - both in terms of picture clarity and its size. Resolution - 960x582
HD 720p or 1mpx - or as it is also called HD ready, this is a higher resolution video format and more modern. Until recently, literally 5 years ago, it could be called exemplary. Nowadays, only the most budget cameras are equipped with video surveillance matrices with such a resolution. The resolution is 1280x720. This format is now actively becoming obsolete.
1.3 mpx or 960p is a transitional option between HD ready and Full HD. Now you can often find such a solution in budget cameras, it has come to replace HD. The resolution is 1228x960.
Full HD or 2 mpx - at the moment this video format is an example of quality, in video surveillance it is generally the golden mean. The term price-quality is perfect for cameras with such a resolution. The picture is quite clear, and the size of the picture allows a larger number of objects to get into the frame. The resolution is 1920x1080.
3 mpx - this resolution (1920x1356) is a transitional resolution from Full HD to 2K category. For example, a resolution of 4 mpx (2560x1440) will already be a 2k resolution, but I did not include it in the diagram in the picture, the fact is that cameras with a resolution of 4 mpx now cost about the same as 5mpx. And the difference is quite noticeable.
5 mpx is an exemplary representative of 2K resolution, cameras with this resolution show a very good picture, perfect for identifying cars and license plates entering the territory. And most importantly, recently we can find budget options for such cameras on the video surveillance market, for example, models from the TopVision line and. However, as 5mpx CCTV cameras became affordable, regular user appeared to receive high-end video surveillance, which was previously available to large shopping centers and industrial facilities. The resolution of such cameras will be 2560x1920.
8 mpx is already a representative of 4k resolution, cameras with such resolutions are already considered professional solutions. The price category is above average. Resolution 3840x2160.
12 mpx - at the moment cameras with this resolution are expensive and belong to the top category of video surveillance equipment.
Of course, this is not very relevant in video surveillance, however, for a better understanding, let's add the difference in the vertical scan resolution.
About the difference between 1080p and 1080n.
Looking at the previous plates, the difference in 1080p (AHD-H) and 1080n (AHD-NH or 1080 Lite) is immediately apparent. Below are real footage in 1080p and 1080n resolution.
However, with hardware processing by the DVR, the image is stretched to 1080p and the difference becomes invisible at a quick glance.
However, when you zoom in with the digital zoom, the difference becomes more noticeable:
Zoom at 1080n
As a result, it is very noticeable how 1080n, when approaching, begins to lose in the quality of drawing smaller details. Therefore, if you want to see bills or car numbers from a farther distance, it is better to choose 1080p resolution. However, if the distance is not more than 15-20 meters for viewing, then 1080n will cope with the task, for a longer distance, you need to give preference to 1080p or cameras with higher resolution.
Bottom line.
In conclusion, I would like to say that the size of the picture, that is, its resolution, is not a guarantee of quality. And only one of the derivatives. For a clear and high-quality picture with a good viewing angle, the quality of the digital matrix and the lens are also responsible, in addition, even the power of the DVR. The final image quality on the display is also affected by the way the video signal is fed, via VGA or HDMI. Therefore, if other variables do not meet the acceptable quality, then the final image will suffer. It can be compared with muddy water, no matter what area we would spill it into more or less, it will not cease to be muddy water.
We also bring to your attention a video where the differences between different cameras are well shown - both the differences in the resolution of the matrices and in the focal length of the lens:
Technologies do not stand still, just as marketing specialists are not asleep. All means are good in the pursuit of global price reductions. Today we will tell you about one of the common misconceptions about 2MP resolution that you may encounter when purchasing an AHD DVR.
A bit of history ...
Just two and a half years ago, a new technology, AHD (Analog High Definition), became widespread in the video surveillance market. Due to its qualities, such as high resolution, long range of video signal transmission without the use of additional funds, the possibility of gradual replacement of outdated equipment with new one, excluding the replacement of cable products, low cost of the solution, AHD instantly completely replaced analog video surveillance from the market. The resolution of the first AHD camcorders was 1MP and 1.3MP, which was 3-4 times higher than the resolution of a standard 700TVL analog camera. Less than a year later, the first 2MP AHD camcorders appeared. But it was impossible to connect them to DVRs recording video in 720P resolution, instead of the image from the camera, users saw a black screen. To record video from such cameras, a separate series of 1080P video recorders was released, where it was possible to connect in pairs video cameras of different resolutions - analog, AHD 1-1.3MP and 2MP. But the price of such registrars significantly exceeded the cost of 720P registrars. A few months have passed and 720P DVRs, supplemented with 1080N recording mode, went on sale, allowing you to connect 2MP, 1MP, 1.3MP and analog cameras in any order, bypassing the pairing rule. It would seem that the problem has been solved, but everything turned out to be not so simple ...
1080N - 2MP?
Currently, the price of 1080P and 720P DVRs with 1080N mode differs by about 20%. But the people yearn for the cheap. Unscrupulous manufacturers and sellers are positioning 1080N DVRs as 2MP, which is actually not the case. It is known that the resolution of 1080P (2MP) is 1920px horizontally by 1080px vertically. And it looks like this:
1080N is 944px horizontal by 1080px vertical and video from a 2MP camera recorded at 1080N looks completely different:
When you buy a 1080N video recorder and the seller connects a 2MP camera to it, you see an image with an aspect ratio of 16: 9 like in the first screenshot, how can this be? In terms of the number of pixels, 1080N vertically coincides with 1080P (1080px), and horizontally it is 2 times less (944px). In order to stretch it to "2MP", interlaced recording and hardware processing methods are used, thanks to which the 944x1080 image is stretched and smoothed in the horizontal direction, thus in real-time viewing the aspect ratio is obtained as for 2MP - 16: 9, while the image quality remains 944x1080px, and it's impossible to call it 2MP! The image is of better quality than 1 megapixel (1280x720px), which of course is confusing and creates the illusion of 2 megapixels, while it is actually far from fullHD. If you view the camera in recording without players with appropriate image processing, you will see the real resolution 1080N (screenshot # 2).
It's all about one letter
Savings must be economical. We never deceive our clients. When we sell 1080N recorders, we are not positioning them as suitable for recording 2MP cameras. By saving 20% you save 50% in image quality. Beware of unscrupulous sellers and dubious cheapness!
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The size of bitmaps and video is usually expressed in terms of the number of pixels in width and height. It is inconvenient to remember and pronounce such a combination of numbers, therefore, as a relief, the corresponding value is used - resolution. In this article, we will explain what HD resolution is, where it is used and how many pixels it is.
HD is an abbreviation of the English phrase High-Definition, which translates as High Definition Video. Since there is no generally accepted standard for high definition, due to the regular increase in resolutions, HD is considered to be the highest quality resolution in relation to previous standards. HD first appeared in the early 1980s, when Japan, Europe and the United States began to improve the television process. The new format accommodated 720 lines in a frame against 576 lines in PAL and 480 lines in NTSC.
For information. Resolution is a value that determines the number of dots or pixels in the frame. The size is calculated by multiplying the vertical lines by the number of horizontal lines: 640x480, 1024x576, etc. The more lines and / or lines, the better and clearer the picture. One line and one line only has 1 pixel.
Originally, the term HD described the resolution of the video signal transmitted to the TV screen. Later, the HD standard began to be applied to images and graphics in digital form, video recordings from digital cameras; more to the screens of TVs, monitors, laptops, tablets and smartphones. The term also describes the quality of textures in games: SD (PAL) - lower resolution, which is preferable for weak systems; HD - higher resolution, which is preferable for productive computers. This standardization makes it possible to achieve a more accurate representation of picture quality.
To highlight support for the HD standard in electronic devices, manufacturers often indicate the "HD Ready" logo. Typically, this marketing term refers to TVs, laptops, monitors and projectors. At the same time, the resolution of some laptops and monitors is in fact higher than standard HD, so there is no HD Ready logo in such devices.
The standard for HD is 1280 horizontal and 720 vertical. To get the total, you need to multiply 2 numbers - 921600 pixels. It should be borne in mind that at certain aspect ratios, the length of the lines varies, but the width remains unchanged - 720.
For more information on standardized output device resolutions, see the table at this link.
More modern Full HD and Ultra HD standards are a logical continuation of HD, where the key difference is in the increased resolution - 1920x1080 and 3840x2160. Such an image contains more pixels, respectively, the level of clarity and detail is higher. At the same time, it is logical to use high resolution in devices with a large diagonal. Because the detail of a large picture on a small screen is hardly noticeable. And the use of small resolution on a large screen leads to a deterioration in the clarity of the picture.
Until the end of 2017, Android smartphones used standard HD resolution with an aspect ratio of 16: 9. In order to increase the diagonal without significantly increasing the dimensions of the case, the industry has massively switched to non-standard aspect ratios 18: 9, 19.5: 9, 20: 9, etc. This transition has laid a new standard for smartphones, which is called HD + and FullHD +. With an aspect ratio of 18: 9, the number of pixels for HD + is 1440x720, and for FullHD + - 2160x1080. Accordingly, as the aspect ratio increases, the length of the lines will also increase.
In the article, we examined in detail HD resolution - what it is and how many in pixels. The standard is being actively replaced by more modern formats with an increased number of pixels - Full HD and Ultra HD. At the same time, HD resolution remains relevant as an input threshold for "high-quality" video recording, the initial resolution of budget TVs and laptops.
What resolution are you using? Share your opinion in the comments below the article.
