Megapixel cameras can offer image resolutions higher than broadcast HD resolution, and I think an explanation is in order. Megapixel vs. HD One could consider HD a subset of megapixel. HD is defined by specific resolutions at specific frame rates with a specific aspect ratio. Any camera with a resolution of more than a million pixels is by definition a megapixel camera.
The lowest resolution in the megapixel range in the security market is around 1. The range of megapixel cameras continues to expand to accommodate various application requirements. For example, at my own firm Arecont Vision, we have a wide range of megapixel cameras that includes 1. HD refers to cameras with a standardized resolution of p or p. The numbers and refer to the horizontal resolution.
Therefore, p HD camera resolution provides images that are x pixels that adds up to , pixels, which means a p HD camera is not technically a megapixel camera , and p HD cameras provide x pixel resolution, or 2. The HD video format also uses an aspect ratio of rather than or , and the frame rate is standardized at 60, 50, 30 or 25 frames per second the fps depends on your TV.
According to a report by TechNavio Insights, IP surveillance is poised for significant growth among end-users and large organizations. The benefits of software-driven functionality and the control, scalability and broad availability of video are often listed as factors contributing to this growth. However, among the biggest performance features of IP surveillance is the ability to provide a broad range of video resolutions.
With H. Core areas can then be viewed and recorded with higher resolution quality while secondary areas are viewed at less resolution with slower frame rates. Many companies use a different abbreviation when specifying megapixels, as no uniform abbreviation has yet been established. We use Mpx as an abbreviation because, in our experience, px is the most common abbreviation for pixels.
Many camera manufacturers use megapixel resolution as the most important quality feature of their products, as it is the easiest quality feature to understand. It is by far not the most important thing now that almost every camera has enough resolution for normal use 12Mpx and up. Megapixels only become important if you want to display images on a larger medium or enlarged sections posters, large posters, professional photo presentations. If we assume that the image should only be displayed on the Internet, we actually only need a very small number of megapixels, mainly because of the file size that should be as small as possible on the Internet.
The images on this blog are displayed with a maximum width of pixels. So I reduce a large picture so that it is exactly pixels wide. The following picture has a resolution of x pixels and would only require a 0. But if we want to display a section of the image from above in the same quality x pixels , the original image must be a lot larger.
The original above of the following picture should have a camera resolution of 12 Mpx:. The resolution is always calculated based on the image size and quality for the application. The quality is the point density dpi, dots per inch. You can use the following guidelines:.
You are welcome to use our pixel calculator to calculate other resolutions: Pixel calculator. The reason why many camera manufacturers actually calculate 1 megapixel at x as the basis for the MP calculation lies in the architecture and manufacture of the sensors.
A camera sensor is divided into fixed blocks, each of which ranges from 16 pixels up to pixels in steps of 16 pixels, 64 being a standard value. If I had a camera with a width of pixels, divided into pixel blocks of the sensor, this would result in an odd number of That is not technically possible. Since reading out in pixel blocks is faster today, 16 blocks of 64 pixels each are built in.
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