# \[License Plate Recognition\] Exposure Settings for LPF sensor module (best practice)

**URL:** https://community.mobotix.com/t/license-plate-recognition-exposure-settings-for-lpf-sensor-module-best-practice/3451
**Category:** General FAQ
**Created:** [December 21, 2020, 1:47pm UTC](https://community.mobotix.com/t/license-plate-recognition-exposure-settings-for-lpf-sensor-module-best-practice/3451 "2020-12-21T13:47:45Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Mx-PhilippH](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.mobotix.com/mx-philipph/32/10382_2.png) [@Mx-PhilippH](https://community.mobotix.com/u/Mx-PhilippH)
#### Post date: [December 21, 2020, 1:47pm UTC](https://community.mobotix.com/t/license-plate-recognition-exposure-settings-for-lpf-sensor-module-best-practice/3451/1 "2020-12-21T13:47:45Z")

</div>

In this article, we will explain the **recommended exposure settings** for the usage of an **LPF sensor module for license plate recognition**.

The settings are suitable for use **both during the day and at night**.  
We would like to point out that the recommended settings will most likely not fit perfectly for all installations. Therefore, they must always be **tested and accepted by the customer**.

**NOTE:** Due to the properties of the Long Pass Filter (LPF), make sure that the camera is **equipped with an infrared functional module** (optional: external infrared illuminator) and that this is **continuously active** (no camera automatic).

**1) Recommended exposure settings:**

Please note the following excerpt from the configuration of a camera for license plate recognition.  
Parameters that must be adjusted for the use of an LPF sensor module are:

- Automatic Contrast: Off
- Average brightness: 40%
- Minimum Average Brightness: 20%
- Night Improvement: Off
- Sensor Gain Range: High
- Exposure Time: Max 1/250, Min. 1/16000

 ![1](https://canada1.discourse-cdn.com/flex030/uploads/mobotix/original/2X/a/a7d2689de80cf3058eb87119f251d410164b77d5.png)

 ![2](https://canada1.discourse-cdn.com/flex030/uploads/mobotix/original/2X/8/8138b845b35000c5984b416104d3c052b13a352e.png)

**2) Expected Result**

The following images show the expected results of the exposure setup with LPF sensor module during day and at night.

- 4K LPF Sensor Module during day:

 ![LPF_Image_Day_4KDN_20201221](https://canada1.discourse-cdn.com/flex030/uploads/mobotix/original/2X/f/fd998b8a4d18eebf053228df879092951021ce13.jpeg)

- 4K LPF Sensor Module at night:

 ![LPF_Image_Night_4KDN_20201221](https://canada1.discourse-cdn.com/flex030/uploads/mobotix/original/2X/b/b2077004f931371871266e02d6e7e0954d8626af.jpeg)