That to me Mark just screams insufficient bandwidth. Looking at the 4mp screenshot, the image is over sharpened and full of artefacts - a particular area that stands out in comparison between the two is the road. All of what I'm seeing points to over compression. That might not be BI but it could be Dahua's in camera compression rate. I rather suspect looking at it they're trying to compress too much info into too little bandwidth.Dr. Looney2S: A or B...1 or 2
I found it to be surprisingly good. I don't get a lot of traffic after dark, but it did well the the few times I was able to try it out. Since, there is new firmware, I will test that more in depth, as I now have a little more free time. I have plenty of moving tree shadows to give it a work out during the day.Hi @looney2ns, thanks for your efforts in this review.
From your testing, do you have any comments on how well the AI (people, vehicle detection) worked, especially at night?
The ability to discriminate between people and cats/dogs would mean I could stop all the false PIR triggering of external lights due to animals.
Yes, they were using the same compression, I also did a trial using different compression types to see if that was the cause, but it didn't cahnge anything.Thank you, CCTVCam! I knew there was something bothering me about the 4mp vs. the 2mp images, but did not know how to put it into words--much less have a technical explanation for it. I think you've nailed it. This may explain why some of us look at the A/B images and are underwhelmed with the newer product's images.
I note @SecuritySeeker made similar comments wrt to some low-light images a page back.
@looney2ns: I don't recall, or recall if you even mentioned it, but both cameras were using the same compression, yes? (Not that I expect you'd make such a n00b mistake, but, with @CCTVCam's remarks, the question must be asked.)
Andy, I'm not comparing the 4.0-AI VS eg. the 5231R-ZE, I mean that the SmartIR, even on the ultra series, such as the HFW8232E-ZE, or the HFW81230E-Z, IMHO, is not even close to the Smart IR of the Hikvision DS-2CD2042WD-I, and I'm not an Hikvision fan, since I bought the first dahua camera (from you), I've only bought dahua...dahua guy told me Smart IR is same as the current IR Auto we use on the new 4.0AI camera.
The trouble with the same compression is it's trying to fit twice as much picture detail information into the same amount of bandwidth ie 4 million pixels worth instead of 2 million pixels worth. So technically, on paper it's not the same compression, theoretically you've doubled it (or by doing so, halved the quality) ie so whilst the available space has remained the same, the amount of information you have to fit into it has doubled. In turn, that means more information has to discarded and recreated as a texture reference (with mistakes) to get it to fit.Yes, they were using the same compression, I also did a trial using different compression types to see if that was the cause, but it didn't cahnge anything.
@EMPIRETECANDY has recently obtained new firmware for the cam, and It has fixed some original issue's, such as "auto" Ir not working. I've not had time to do a new side by side, but will very soon.
The stills with the eye chart were taken directly from the sd cards on the cam.
Loryta is my registered brand in US , empiretech still under registering. All will be by us. All are dahua original International updated cams.I believe these cameras are on Amazon but they say they are by Loryta . What is Loryta ?
Are there differences between Andy directly, Aliexpress, and Amazon? Looks like they all sold by Andy.