For an image to be classified as 2K Extreme HD, it must have about 2000 horizontal pixels and for 4K Ultra HD resolution it must have about 4000 horizontal pixels.
Industry standards typically include the 2K Extreme HD pixel ratio of 2048 x 1536 and 4K Ultra HD as 4096 x 2160.
4K Ultra HD technology guaranteed:
IPC2128SR3-DPF40 is a 4k Mini Bullet IP
Smart IR , up to 30 m (98 ft) IR distance
Optical glass window with higher light transmittance
IR anti-reflection window to increase the infrared transmittance
2D/3D DNR (Digital Noise Reduction)
Up to 120 dB WDR (Wide Dynamic Range Compression
Ultra 265,H.265, H.264, MJPEG
Embedded smart algorithm