thermal image synk and lepton reboot problem using lepton 3.5 and rpi 4

[CHOI]

I am using a LEPTON 3.5 and breakout board v2.0 and a Raspberry Pi 4 model to acquire thermal images.
The code I am using was downloaded from the address below.
https://github.com/groupgets/LeptonModule

The problem is that if the image is out of sync, the lepton device reboots.
In this process, the image is not received properly for about 2-3 seconds.
So I would like to correct this part.

I looked it up and it seems to be related to the automatic calibration of the shutter, but there is no detailed explanation in the datasheet.

Please answer in which cases the image is out of sync and requires a reboot.
Please help me.

[sa...@pureengineering.com]

I would look at this code and see how the sync is handled.  

https://github.com/groupgets/purethermal1-uvc-capture

Basically you need to capture fast enough to not drop any frames all the time. 

[CHOI]

I am using a LEPTON 3.5 and breakout board v2.0 and a Raspberry Pi 4 model to acquire thermal images.

The code I'm using was downloaded from the address below.
https://github.com/groupgets/LeptonModule

I want to get the celsius temperature value.

First of all, when saving Lepton thermal raw data, unsigned 16 bits are stored on a scale from 0 to 255. 

To convert this to degrees Celsius, I proceeded with reference to the equation below.
Temperature = 28.4 + 16-bit raw *(36-28.4)/255

The problem is that the Celsius temperature is not accurate.
So, if you know any other way to store raw data from Lepton and convert it to celsius data, 

please help.

2022년 7월 12일 화요일 오전 12시 57분 16초 UTC+9에 sa...@pureengineering.com님이 작성: