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[I, C]Image cropping
Image cropping refers to remove of the outer parts of an image depending on the application.
1080p and 720p and 4CIF all have different aspect ratios, and often 1080p IP cameras use cropping for 720p video stream. But this result in different field of view.
DIP cameras use scaling to deal with these different aspect ratios. Instead of cropping out the images, it scales and streches the images maintaining the same field of view regardless of the resolution used.
DirectIP cameras talk to DirecIP NVRs using DirectIP protocol. They can discover each other on the same subnet automatically. This is called auto scanning. No IP address, subnet mask, gate way information settings are required for each IP cameras, which is a big time saving during the installation.
Bit rate is a little bit controversial. the codec engine is the game of using less bit rate for the equal or better video image quality. given the same codec profile, the bit rate roughly translates into the amount of information about the video image quality allowed to reconstruct the video image.
A reasonable and optimized bit rate is used in most IP camera codec engines. but sometimes, you meet an application that requires a lot higher fidelity. You can tackle it with higher mega pixel cameras, or you can tackle it with higher bit rates.
In DirectIP product, we use basic~very high quality that use bit rates optimized for most video surveillance applications. And 12Mbps@1080p@30IPS is one of the best that you will find.
codec comes in different capabilities. a profile is a collection of techniques used in a codec engine. the more sophisticated techniques are used, the higher compression efficiency, and the better codec profile with different bit rate. in H.264, typically base profile is used in lower cost codec engines, and main profile or high profile is used for more high end IP cameras.