![]() These terms refer to how many pixels of an image sensor would be spread across a 1 meter or 1 foot horizontal measurement in a scene. Specific pixel density levels in CCTV images are referred to as PPM (pixels per meter) or PPF (pixels per foot), depending on the region where the system is being specified. It does not address how many of those pixels are focused on a specific object or area of the image, which is the pixel density. Resolution describes the total number of pixels in an image, or the total number of pixels of an image sensor. Sometimes resolution is confused with pixel density, particularly by users not familiar with CCTV concepts. Calculating which sensor and lens combination is required to deliver the right level of detail, or pixel density, in a given area is the job of the qualified system designer. That same sensor mounted high above a large parking lot, looking at an area large enough to hold 500 vehicles would capture very little detail. As you might imagine, a 4MP (mega-pixel) image sensor looking at an area the size of a postage stamp would capture very high detail. In order for our systems to meet the expectations of the users we need to first know what level of detail the user requires, often referred to as “Pixel Density”. These factors can lead some users to expect more detail from their CCTV systems than the system is actually capable of. Our cellphones can capture images at 10 megapixels or more, common televisions can stream 4K content, and multi-megapixel CCTV cameras are part of almost every system installed today. We are surrounded by high detail images every day. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |