Dahua Thermal Cameras FAQ, Thermal cameras, which do not require a light source, are excellent for providing enhanced coverage in diverse environments, such as those with harsh conditions or extreme darkness. In addition, thermal cameras have long range detection and temperature measurement capabilities, allowing them to be used in conjunction with visible light cameras to achieve all-weather monitoring and comprehensive surveillance.
Dahua’s thermal cameras covers both thermal and visual cameras to meet different user demands. Thermal cameras are widely used in applications such as perimeter protection, protection of key components (electrical facilities, gas pumps, etc.) and over-heating detection in critical infrastructure, forest fire prevention, and other scenarios.
Visible light image #
Description:
Visible light image of the binocular heavy PTZ is normal at low magnification and completely blurred at maximum magnification. Click Manual Focus to ensure clear images.
Cause analysis:
The visible light focusing parameters are not configured to the best effect.
Solution:
Contact R&D technical support, reset visible light focusing parameters, re-take curves, and adjust focusing parameters.
Description:
For small stereo vision bullet cameras, there is no image under visible light and the picture is completely black, and occasionally flashes horizontal stripes. The image has no change when a handshakes in front of the lens, but there is stream and OSD information.
Cause analysis:
Poor or damaged contact for FPC wire under visible light.
Solution:
Description:
The stereo vision PTZ shows images under visible light, but the scene edge features abnormal color. Restarting the device and resetting the visible light parameters do not work.
Cause analysis:
Poor or damaged contact for FPC wire under visible light.
Solution:
Description:
The stereo vision heavy PTZ gives no image under visible light, the image has no change when a hand shakes before the lens, and the serial port prints are messy.
Cause analysis:
Visible light movement is damaged.
Solution:
Contact R&D technical support for instructions on replacing visible light movement, and then replace the movement.
Dahua Thermal Cameras FAQ #
Description:
In the low illumination scenes, there are relatively more noise points under visible light and the images show poor effects.
Cause analysis:
In low illumination scenes, due to insufficient illumination, visible light images have relatively more noise points.
Solution:
Increase the advanced noise reduction value. (It’s set by default that basic noise reduction is enabled.
Description:
Messy OSD information for visible light images of the binocular heavy PTZ (40 X visible light movement)
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Cause analysis:
The visible light movement program is old, leading to this problem occasionally.
Solution:
Upgrade the visible light movement program or turn off OSD information with tools.
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Description:
The visible light image has a red picture. Switching the black-white mode can take effect and the color is normal, but the image is always red in the color mode.
Cause analysis:
ICR switching anomaly under visible light
Solution:
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Description:
The zoom of visible light image of small binocular PTZ is invalid, but other functions are normal.
Cause analysis:
The main print switch is on.
Solution:
Enter serial port debugging mode or shell mode, and set dh_keyboard to 1.
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Description:
Visible light (movement version) is not clearly focused under large or small magnification, and manual focusing is invalid.
Cause analysis:
The curve of visible light lens is not taken well.
Solution:
1. Use the netSDK or ViscaClient tool to expand again the curve, generally by 15 steps;
2. If the visible light movement does not have enough margin and the expansion cannot work, replace the movement.
Thermal imaging #
Description:
In case of switching scenes, the thermal image might has ghost or is completely gray. The pesudo-color can be switched. The device restart and the recovery to defaults do not work.
Cause analysis:
The thermal imaging baffle is stuck.
Solution:
Click Shutter Correction in the FFC setting of the web interface. If the image cannot be restored, replace the thermal imaging baffle.
Description:
For binocular speed dome cameras, the thermal image has vertical lines, and these lines still exist after switching the baffle.
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Cause analysis:
The detector temperature is too high (60℃), resulting in high temperature noise.
Solution:
Upgrade movement program (versions after 20180724).
Description:
Thermal images show abnormal temperatures, which can be recovered to normal after restarting the device.
Cause analysis:
The thermal imaging movement program occasionally shows bugs.
Solution:
Contact R&D technical support to upgrade the movement to the latest supporting movement program. Before upgrading, confirm the lens parameters on the advanced interface. After upgrading, confirm again whether the parameters are changed. If any, modify them manually.
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Description:
In the low temperature scenes, the thermal imaging effect is relatively poor, and also different at night and during the day.
Cause analysis:
In low temperature scenes, the target temperature difference is relatively small and the image contrast is relatively low. The temperature is lower at night than during the day, resulting in a slightly worse imaging effect at night.
Solution:
The contrast, sharpness and detail enhancement parameters of the thermal imaging channel can be appropriately increased (noise points will be relatively obvious if the parameters are too high).
Description:
In outdoor scenes, the thermal image is relatively blurred compared with the indoor one.
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Cause analysis:
In outdoor scenes, there are many moving objects, and it is better to set a high dynamic scene.
Solution:
For outdoor environment, it is recommended to set a high dynamic scene. For indoor environment, it is recommended to set a low dynamic scene.
Description:
In the scene with extremely high humidity in rainy and foggy days, the thermal image is especially blurred and cannot show the target clearly.
Normal weather Rainy and foggy days (high humidity)
Cause analysis:
In rainy and foggy days with high humidity, the target temperature difference is extremely small. Since thermal imaging is based on received thermal radiation, the imaging effect will be relatively poor.
Solution:
In rainy and foggy days with high humidity, the thermal image has poor but normal imaging effects.
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Description:
For binocular PTZ, there is no image under thermal imaging, and the picture is completely black. The stream is normal, and the picture does not change when a hand shakes in front of lens.
Cause analysis:
The old movement program may lock itself occasionally.
Solution:
Upgrade the programs in the following order:
1. Main program: 2.6.01.05.04502 General_TPC-NYX-Phoebe_EngItlSpnFrn_NP_V2.622.0000000.7.R.181029.zip
2. Movement program: 2.6.01.99.00077 General_TPC-NYX5800-BX_V1.000.0000000.5.R.181016.zip
3. PTZ MCU program: 2.6.02.05.00249 General_TPC-SD8X20B-HN_MCU_V2.200.0000000.9.R.180915.zip
4. Clear configuration.
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Description:
There is no obvious improvement by adjusting the image parameters.
Cause analysis:
The main program version of thermal imaging does not match the movement program version.
Solution:
According to the device, upgrade the supporting main program and movement program.
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Description:
Blurred screen under thermal imaging and abnormal color bar output.
Cause analysis:
Abnormal data output of thermal imaging movement.
Solution:
First try to restart the thermal imaging movement to see if it can be restored. If not, replace it.
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Description:
Information in yellow font is displayed at the upper left corner of the thermal image.
Cause analysis:
The thermal imaging movement program is old, leading to this problem occasionally.
Solution:
Body temperature Monitor #
Check the device version, the system version is 20200313 and later, the thermal camera version is 20200306 and later
Referring to the picture on the right, the position of the face comparison frame does not match the actual position of the face, and the recognition frame needs to be moved to the face
How to move the face frame?
Step 1: Click the image adjustment icon to enable the adjustment interface
Step 2: Click the up, down, left and right icons to move the face frame to the actual face position
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Adjust Horizontal Zoom and Vertical Zoom to appropriate thresholds (if the background is high temperature, set the horizontal/vertical zoom to 50), the face frame needs to be on the face (without hair) and there should be no background high temperature interference.
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Need help on site to test. The character stands 2 meters behind the black body, and draws the minimum size based on the size of the target face. After the drawing is completed, stick to the position 2 meters away from the black body, so that the character can be detected normally when one step forward, and no longer detected when one step backward.
Set the Snap Angle Filter and set the face angle to an appropriate threshold. If there are many high-temperature environments in the background, it is recommended to set the reference value to 20. At the same time, turning on the “Only Measure Forehead Temp” function can effectively reduce the false alarm caused by the background high temperature.
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Check the device version, the system version is 20200313 and later, the thermal camera version is 20200306 and later.
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Changed the Temp Lower Limit lower from 32ºC to 25ºC. (The factory default value is 32ºC).In order to avoid the situation that the camera does not detect or detects less.
Non-Body temperature Monitor #
Solution: Set the Target Radiation Coefficient in the rule and the Target Radiation Coefficient in the global setup to the same value. Please refer to the picture below
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Reason: When the device reaches the temperature threshold of cryogenic protection (default is 10ºC), it will trigger the cryogenic protection function and affect the zoom and focus of the visible light channel.
Solution: Turn the heater on to automatic heating mode and set the turn-on temperature to -8ºC.Restart the device after the device warms up
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Solution: There are occasional bugs in Thermal Camera version, mostly in older camera movements. Need to go to GDP to download the latest movement program upgrade
General Issue #
Reason: Browser plug-in compatibility issues
Solution: Reinstall the plugin after deleting the plugin, file directory: C:\Program Files (x86)\webrec
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Reason: The flash chip program is lost or damaged
Solution: Need after-sales maintenance, replace a new flash chip or replace the motherboard
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Reason: BF2221 judges whether to turn on the fill light according to the visible light image. Under certain lighting conditions, the fill light is not sensitive to turn on.
Solution: Download the latest baseline: DH_TPC-BF2221-TB_Chn_P_V2.630.0000000.11.R.210803 and later version
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Reason: The device periodically performs shutter calibration, but the shutter is not actually moving
Solution: If the device program is older, you can upgrade to 20210323.bin and later to observe. If the fault does not recover, it is a block fault, and the equipment needs to be returned for repair.
Solution:
1) Replug the visible channel FPC cable
2) Replace the visible channel FPC line
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Matching problem #
Reason: In Onvif’s baseline library, when the NVR subscribes to an event, onvif will automatically enable the motion detection.
Solution: Connect the thermal camera to the NVR in private mode or submit the weOR process for customization
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Reason: bugs in old programs
Solution: Upgrade the program of the equipment to the corresponding latest baseline program
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Reason: Older versions of ODM test tools do not support H.265 encoding mode
Solution:
1) Set the encoding mode of the device to H.264
2) Update ODM test tool
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Supporting #
Description:
The thermal imaging device is connected to NVR in Onvif mode, and the NVR is restarted. The accessed thermal imaging device will automatically enable the motion detection.
Cause analysis:
In the ONVIF baseline library, when NVR subscribes to an event, ONVIF automatically enable the motion detection.
Solution:
The thermal imaging device accesses NVR in private mode or initiates customization based on customization requirements.
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Description:
When the resolution of visible light channel is changed to D1, false alarm will be triggered in motion detection.
Cause analysis:
The device program needs upgrade.
Solution:
Upgrade the program.
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Description:
The restart occurs irregularly, when BF2120-T is connected to EVS and Platform 8900.
Cause analysis:
Obtain the printing information of the device as follows:
The “Cloud Upgrade” timer has been timed out, causing the device to restart.
Solution:
1: Clear the device configuration, and do not check options such as “Cloud Upgrade.”
2：Use CGI command: http://Device IP/cgi-bin/configManager.cgi?action=setConfig&_DHCloudUpgradeRecord_.AutoCheck=0
Others #
Description:
Visible light and thermal images of small binocular bullet cameras are abnormal, but with stream and OSD information.
Cause analysis:
Transmission failure for main board and movement signal.
Solution:
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Description:
256*192 channel products (with binocular fusion). After the anti-dither EIS function is enabled, binocular fusion effect is not accurate.
Before enabling the anti-dither EIS function.
Enable the anti-dither EIS function.
After enabling the anti-dither EIS function.
Cause analysis:
After enabling the anti-dither EIS function.
Solution:
Disable the anti-dither EIS.
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Description:
The highest temperature in the thermal imaging rule box of temperature measuring device is inconsistent with that in the picture.
Cause analysis:
The change of the target radiation coefficient in the temperature survey rule box leads to the inconsistency between the highest temperature in the rule box and that in the picture.
Solution:
If the target radiation coefficient is restored to 0.97 by default, the highest temperature in the temperature survey rule box will be consistent with that in the picture.
