Pixel Count: Unraveling the Concept
The essence of a digital image lies in its pixel count - the quantity of pixels incorporated within an image sensor or forming the fabric of a captured image. The higher this count, the more detailed the information derived from the image. Typically, pixel count is denoted in megapixels (MP), where one megapixel corresponds to a million pixels. This metric is vital in defining the resolution of digital cameras and the distinct elements of digital displays.
In terms of video resolutions, the recommended minimum is 1920x1080. High Definition (HD) specifications primarily offer two resolution types, 720p (1280×720, slightly under 1-megapixel) and 1080p (1920×1080, 2.1-megapixel).
FPS: Decoding Frame Rates
The speed of image display is encapsulated by the Frame Per Second (FPS) or frame rate. In simpler terms, if a video captures and plays back at 24fps, it signifies the display of 24 unique still images per second. This speed creates the illusion of seamless motion, tricking our brain into perceiving fluid movement.
Frame rates significantly influence a video's style and viewing experience. Multiple factors govern the choice of frame rate, including the desired realism level, use of effects such as slow motion or motion blur, and the nature of the video content. For instance, cinematic movies typically adopt a 24fps rate to replicate real-world perception. However, live videos or ones with extensive motion may require higher frame rates to capture every minute detail in high clarity.
Choosing the Best Frame Rate: Key Considerations
Contrary to common misconceptions, there's no universally "best" frame rate. The choice depends on the specific requirements of your video. Though the frame rate is a rather direct concept, its selection often sparks debates regarding the optimal viewing experience. Ultimately, your choice of frame rate should align with your creative vision and the technical constraints of your equipment.
Determining Ideal FPS for Security Cameras
The frame rate, or the frequency of consecutive image frames, applies to film, computer graphics, security cameras, and motion capture systems. For surveillance cameras, the frame rate denotes the number of images captured per second. Currently, the recommended frame rate for balance between quality and smoothness is 15 fps. If there is a need for highspeed motion capture, 30 fps may be better but can have a negative impact on the quality of the video.
Balancing Frame Rate and Bandwidth
When it comes to IP cameras, frame rates and bitrates (the amount of data processed in a given time) are closely intertwined. A higher bitrate corresponds to superior video quality, with each resolution offering a maximum limit. For a 2-megapixel IP camera operating at peak quality, 15fps, and h265 video encoding, the bandwidth requirement is around 2,000 Kb/s at this resolution. 30 fps would double the bandwidth requirement to 4,000 Kb/s. Therefore, managing the frame rate involves monitoring the bandwidth demands of all the cameras in the system and ensuring they are within the NVR's (Network Video Recorder) incoming bandwidth limit.
Lowering the Bitrate or Frame Rate
If your system is bandwidth-strapped, you might consider lowering the bitrate or frame rate. A reduced bitrate will decrease the camera's bandwidth requirement, but it may degrade image quality. If this compromise is not desirable, reducing the frame rate could be a viable alternative. Unless you need highly detailed footage of fast-moving objects, a frame rate of 1 to 15 fps could suffice.
We hope this article was useful to you, please leave us a comment or feedback as it will help us improve our customer support center.