OAK Thermal measurement compensation

AlessandroB

Hi,

Normally when using a thermal camera some additional data should be provided, such as emissivity, reflected temperature, relative humidity and working distance. In many cases, a pixel-by-pixel correction is automatically applied too in order to compensate for the particular pixel behavior.

I din't find the way to set those values with OAK Thermal. Is that possible? If not, can you share the values of emissivity and reflected temperature that are applied?

Many thanks.

Alessandro

jakaskerl

AlessandroB
I believe it's a LUT at the moment. These parameters are exposed on the depthai v3 if you are interested.

Thanks,
Jaka

AlessandroB

Hi jakaskerl ,

Can you please suggest some specific documentation/examples about those parameters in depthai v3? I'm unable to find anything.

Thanks!

jakaskerl

AlessandroB

    struct ThermalAmbientParams {
        /// Distance to the measured object. unit:cnt(128cnt=1m), range:0-25600(0-200m)
        std::optional<uint16_t> distance;

        /// Reflection temperature. unit:K, range:230-500(high gain), 230-900(low gain)
        std::optional<uint16_t> reflectionTemperature;

        /// Atmospheric temperature. unit:K, range:230-500(high gain), 230-900(low gain)
        std::optional<uint16_t> atmosphericTemperature;

        /// Emissivity. unit:1/128, range:1-128(0.01-1)
        std::optional<uint8_t> targetEmissivity;

        /// Atmospheric transmittance. unit:1/128, range:1-128(0.01-1)
        std::optional<uint8_t> atmosphericTransmittance;

        /// Gain mode, low or high.
        std::optional<ThermalGainMode> gainMode;
        DEPTHAI_SERIALIZE(ThermalAmbientParams, distance, reflectionTemperature, atmosphericTemperature, targetEmissivity, atmosphericTransmittance, gainMode);
    };

We'll be adding this do the docs as well.

Thanks,
Jaka

AlessandroB

Hi jakaskerl ,

does this struct affect the thermal map produced by the device or does it correct the temperature map in postprocessing on the host?

Thanks,

Alessandro

jakaskerl

AlessandroB
Should be on-device.

AlessandroB

Hi @jakaskerl ,

thanks!