Field-tested settings and mounting rules for low-voltage, gate, and security contractors. Use this guide alongside the site survey for any barrier-gate or roadside ClavePoint install.
You control two of them. ClavePoint handles the third.
The software that reads plate characters. ClavePoint uses a local OCR engine with rule-based diagnostics and review tools. You don't configure this during normal installation.
Frame rate, shutter speed, resolution, and IR illumination. A blurred, overexposed, or low-contrast image cannot be corrected in software. Getting these settings right at the camera is the only way to ensure clean input to the OCR engine.
Where you mount the camera and what angle it points at determines everything downstream. The best camera in the world, improperly placed, will underperform a budget camera that is correctly positioned.
The minimum camera settings you need for reliable plate reads in each situation.
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Barrier / Gate
HOA, parking, car wash
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Urban / Street
Lot entry, enforcement
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Vehicle speed
How fast cars are moving when the camera reads them
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Stopped or near-stopped | Moving at street speed |
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Photos per second
More photos = more chances to get a clean read as the car passes
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At least 5 per second | At least 15 per second |
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Freeze speed
How quickly each photo is taken — too slow and moving plates blur like a long-exposure photo
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1/250 sec minimum | 1/500 sec minimum |
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How far away the camera reads
Distance from camera to where it reads the plate
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~13 ft (4 m) | ~40 ft (12 m) |
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Lanes covered
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One lane | One or two lanes |
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Image quality (one lane, 10 ft wide)
Think of it like TV resolution — HD is enough for one lane
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1280 × 960 (standard HD) | |
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Image quality (two lanes, 20 ft wide)
Full HD covers a wider area without losing plate detail
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1920 × 1080 (full HD) | |
Two angles matter. Here's what they mean in plain English.
Think of tilting your head to look at something on the floor. Tilt too far and you're looking straight down — a license plate photographed at a steep angle looks squished and the letters become hard to read.
Imagine trying to read a name tag on someone's chest. Face-on is easy. If they're turned sideways, the tag looks narrower and harder to read. Same principle with license plates — the more the camera is off to the side, the harder the letters are to read.
Four settings to configure before any ClavePoint install.
Frame rate determines how many chances the OCR engine gets to read the plate as the vehicle passes through the field of view. More frames = more opportunities = higher confidence reads.
Higher resolution increases CPU load — don't set frame rate higher than your scenario requires.
A slow shutter speed causes motion blur on moving plates — the number one source of misreads in the field. The faster the vehicle, the faster the shutter needs to be.
Resolution and lens focal length work together to produce the right plate character size in the image. The OCR engine needs plate characters to be 25–35 pixels tall on USA plates. Too small and it misses detail; too large and you waste processing cycles.
Always select the correct lens focal length for your read distance. Don't use excess resolution — it increases CPU load without improving accuracy.
License plate reads at night or in direct sunlight require IR illumination to produce clear, evenly lit images. Most dedicated LPR cameras include built-in IR. Standard IP cameras often require an external IR illuminator.
Short read distance (~4 m). Vehicles stopping or near-stopped. Single lane. Most HOA, parking, and car wash gates fall here.
Medium read distance (~12 m). Moving vehicles at street speed. Parking enforcement, lot entries, and access lane monitoring.
Same rules whether you're doing a gate or a street-side install.
When a camera looks steeply down at a plate, the letters appear squished and the plate recognition engine starts making mistakes. The steeper the angle, the worse it gets. Keep the camera positioned so it's looking at the plate fairly level — not staring straight down at it like you're looking at your feet.
A camera that's looking from the side at a passing car will see a plate that looks narrower and more distorted — similar to trying to read a book that's angled away from you. Mount the camera so it's pointing mostly toward approaching vehicles, not across the lane.
Site conditions and vehicle factors beyond camera settings.
High-contrast objects in the frame behind vehicles can fool the OCR into trying to read them. Clear the read zone background of:
Never aim the camera directly at a light source. These will overexpose the image and wash out the plate:
Note: IR illumination directly at the camera (from another source) can also overexpose IR-sensitive cameras.
Some misreads are not a camera or software issue — they are physical:
Front plates are generally cleaner than rear plates — rear plates accumulate road spray. Use front-read where possible.
Run through this before mounting anything.
This checklist is interactive — click items to mark them complete.
Concrete answers for contractors, IT, and HOA boards before the site survey.
The lens has to make the plate fill enough of the frame to be readable. Use a varifocal lens so the installer can fine-tune after mounting.
Wired Cat6 with PoE is supported up to 100 m / 328 ft from the PoE switch. Use outdoor-rated Cat6 with surge protection on any cable that leaves the building.
Beyond 328 ft, use a point-to-point wireless bridge instead of trying to extend Ethernet. Fiber is also an option for long campus runs but the contractor should size it.
ClavePoint is tuned for gates where vehicles stop, crawl, or roll through at low speed. A 10–15 fps stream with the right shutter is enough for plates at gate speeds; faster frame rates do not improve reads at a stop bar but they do increase CPU and bandwidth.
If the lane has rolling traffic (drive-through car wash entry, no stop bar) tell us during the site survey — the camera placement and exposure profile change.
Appliance sizing is confirmed during quote. One to two active 1080p ALPR streams are typical for small gate sites; more lanes or multi-gate sites may need larger hardware.
Each 1080p H.264 camera at 10–15 fps typically uses 2–5 Mbps. Storage stays small because we keep plate text and event metadata by default; image storage is off unless you turn it on in the data-retention settings.
Some public-sector, federally funded, or sensitive sites require documented camera, recorder, or component status before purchase.
HOAs, private car washes, and private parking lots often do not have the same procurement requirements, but some boards still ask for component documentation. Exact SKU and component status are confirmed in the quote when required.
Paper / temp tags: readable when clean and flat, but they fade and curl. Tell residents to upgrade to a metal plate as soon as the state issues it.
Motorcycles: smaller rear-only plates, often angled. Read rates are lower than cars. We recommend a secondary access method (PIN, remote, or pedestrian gate) for motorcycle-heavy sites.
Vanity / specialty plates: read fine when the characters are standard. Heavily stylized graphics or tinted plate covers reduce accuracy — ask residents to remove plate covers.
Dirty or damaged plates: the dashboard flags low-confidence reads so staff can follow up with the owner.
Yes. The whitelist, blacklist, and event log live on your appliance and can be exported by an admin from the dashboard. ClavePoint does not sell plate data; external access is governed by customer-enabled support, integrations, legal obligations, and applicable terms.
For board governance, we recommend a periodic export of the approved-plate list so the HOA, car wash, or operator has an offline copy independent of the appliance.
Send a gate photo, the camera location, and a quick note on power and conduit. We will confirm the simplest install path before you order hardware.