fergenheimer said: @wittaj I have read your responses to this question a dozen times and believe it is also in the WIKI . I imagine that when you say "the same 1/2.8" sensor" you mean the same size and not same model sensor. If we were to look at the board on a quality camera, I suspect we would see different sensors. On a cheap camera, there might be the same lower resolution chip and an 8M might be uprezed in firmware. I wonder about sub streams. Are they just downrezed images? If so and I have them enabled is that always using processing power just like it does if we run an 8M camera at 4M? One day, I might have the time to try these things on my own. Until then, we rely on the experience of others. Thanks!Click to expand...True there can be superior and inferior sensors out there, so my comment is more about the actual size and not the model of the sensor.
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True there can be superior and inferior sensors out there, so my comment is more about the actual size and not the model of the sensor.But what we have seen is that outside of the 1/2.8" sensor, if somebody is going to the expense of putting together a camera with a 1/2.5" sensor or larger, they are not going to cheap out and will put in a quality sensor (although some have claimed that Hikvision uses a 1/1.8" sensor that isn't as good as what Dahua uses).We have found generally the cameras that follow the ideal MP/sensor ratio tend to put in better sensors AND have better firmware algorithms to address low light performance.So if two manufactures are using the same model sensor, then it comes down to firmware implementation as to how well the camera performs.It is somewhat common to see many cameras claim Starlight capabilities. Starlight and Starvis are simply a marketing term created by Sony for certain models of a Sony sensor.So we will see many 2MP cameras on the market claiming Starlight as their selling point. HDView, Dahua, Amcrest , Lorex, Reolink, and many no-name brands on Amazon and AliExpress use Starlight in their write-up.But does that mean these no-name cameras will perform as well as say a Dahua with the exact same Sony Starlight sensor?The answer is NO. This is an example from Reolink's marketing videos of their Starlight camera - do you see a person in this picture...yes, there is a person in this picture. This is why you cannot buy a system based on marketing terms like Starlight.... Could this provide anything useful for the police? Would this protect your home? The still picture looks great though except for the person and the blur of the vehicle... Will give you a hint - the person is in between the two columns:I have found there is a simple test to determine the quality of the firmware as it relates to the sensor - shutter speed!It has been shown that Reolink (and most consumer grade cameras) favor nice bright static images at night over performance. So at some point even if you can set shutter settings, the camera will override your input in favor of a nice bright image. This is done by slowing down the shutter and increasing the gain. So then you see what Reolinks are notorious for - ghost blur invisible person images at night and inability to capture plates.Same goes for most cameras claiming Starlight technology.So the difference between a better camera like say a Dahua and a Reolink or some no-name camera on Amazon with a Starlight sensor is that you can set parameters on the Dahua and it will hold. If you set parameters on these other cameras that would result in a darker image the algorithm internally says "idiot alert" and it won't let you set parameters that the firmware thinks will result in not displaying a nice bright image.It won't with the reolink...or any cheap camera. It will override your 1/10,000 shutter and favor a bright image. It is a good test to determine how good the camera is.But most consumer grade camera manufacturers know that consumers chase MP, so to keep costs down, they will put 1/3" or 1/2.8" sensors in the cameras. And 8MP on a 1/3" sensor looks great on default settings for a static image at night....and that is what the consumer looks at. No consumer then tests it with motion.It is always comical when a neighbor buys a camera and asks me to help them set it up. I set the shutter to 1/60 or 1/120 and the image gets darker (because the faster the shutter, the more light that is needed). And they always complain the image is too dark. So at some point they go back to auto settings and then capture a blur motion of the perp that door checked their car.Yes using substreams does use some camera processing power. On my one camera that has a system status screen, I have seen that about a 10% CPU jump when using substreams versus not substreams.But substreams and how they are used in a VMS is different than taking a mainstream and downrezing to a lower MP as the mainstream.I am a BI guy and before they added substreams, I turned off substreams in all my cameras - I figure turn everything off you aren't using to allow as much of the camera CPU to be used on what you do have turned on.But when BI introduced substreams, the CPU savings on the computer by using substreams far outweighed the advantages of not using substreams from the camera. As long as one isn't maxing out every rated spec of a camera (FPS, # of IVS rules, using MD and IVS, number of connections, etc.), then using substreams for a VMS system makes the most sense.
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