Setup advice and questions

Your concept of less light but faster processing is a little flawed....

A camera on the proper MP/sensor ratio will have a faster processor than a camera on a less than ideal MP/sensor ratio.

That is why we stress so much proper MP/sensor ratios.

In addition to the smaller sensor with higher MP needing more light, that camera also has a slower processor because it is a budget camera, so if anything it would be slower not faster.

Blur is reduced by faster shutter speed.

The faster the shutter, the more light that is needed.

Therefore the larger sensor lets in more light, thus a faster shutter can be ran, thus less blur...

Keep in mind IPVM is a tool in the toolbox and not a perfect comparison between cameras. It is a guide but I wouldn't count on the images being that clear, especially after about 30 feet.

The IPVM is a tool in the toolbox. After about 30 feet, I wouldn't trust the quality you see on the IPVM tool. Keep in mind they are using the same stock images regardless of camera or distance. So you can take a picture of a person at 15 feet with the tool and then use the zoom of the camera and get the same PPF/PPM number at 170 feet out and it will show the same quality. The sensors are not large enough for that to be possible.

As an example, for a 4mm lens, this is what IPVM said the plate should look like at 75 feet:



And here is what it really is from my 4mm camera at 75 feet:

Yea, I didnt type that very well. I get it on the light buckets, i have an understanding of how. its the "how much do i need" that im working on. And your posts on the importance of MP and LPR cam settings selection is are very helpful.

This might help to visualize sensor size and MP density:

Think of it this way -

Assuming the lenses are the same optical clarity, F stop, for this comparison.

If a light of an arbitrary value, say 100, comes through the lens it is distributed over 2 million pixels in a 2MP camera. That means .00005 of the available light reaches each pixel. If that same combination of lens and sensor SIZE is a 4MP only half as much light, .000025, will be available for each pixel of those four million.
Another way to look at it is imagine you're looking through a piece of 1/4"x1/4" mesh which I'll say is a 2MP sensor. Then you replace that mesh with a regular window screen. Less light gets through because of the finer mesh and we can say that's a 4MP resolution on the same sensor size as the 2MP.

Yes, there's more to it than that. The electronics of the camera come into play as well, IE how ell it can "amplify" the video without introducing noise or other artifacts. The quality of the sensor, itself, and how well it responds to light. From there it gets even more technical, but the basics of sensor size and resolution are the biggest factors IMHO.

@wittaj I think you have one of the cameras linked below. Can you confirm for me that this camera can infact operate fully with just PoE? The pics of the cam with the yellow comp RCA connection is throwing me off.

Slick said:

@wittaj I think you have one of the cameras linked below. Can you confirm for me that this camera can infact operate fully with just PoE? The pics of the cam with the yellow comp RCA connection is throwing me off.

https://www.amazon.com/dp/B07RJQT9NB/?coliid=I2TUGK6UDKV9GO&colid=1Q0D2NA5UMDUI&psc=1&ref_=lv_ov_lig_dp_it

Click to expand...

Yes, that is fully POE. That yellow RCA is if you wanted to hook an external speaker to it.

wittaj said:

Yes, that is fully POE. That yellow RCA is if you wanted to hook an external speaker to it.

Click to expand...

cool thanks. Thatll be my LPR cam, great balance