Viditronic IR Reflection Analysis · Possible Causes of IR Reflection Nearby barriers in the...

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ANALYSIS OF IR REFLECTION ANALYSIS OF IR REFLECTION Exemplified with image samples and a IR dome cover ”How to Clean” guide

Transcript of Viditronic IR Reflection Analysis · Possible Causes of IR Reflection Nearby barriers in the...

Page 1: Viditronic IR Reflection Analysis · Possible Causes of IR Reflection Nearby barriers in the environment Loose contact between the spongeringand Dustand/or grease reflect IR light

ANALYSIS OF IR REFLECTIONANALYSIS OF IR REFLECTION

Exemplified with image samples and ap g p

IR dome cover ”How to Clean” guide

Page 2: Viditronic IR Reflection Analysis · Possible Causes of IR Reflection Nearby barriers in the environment Loose contact between the spongeringand Dustand/or grease reflect IR light

Possible Causes of IR Reflection

Nearby barriers in the 

environment

Loose contact between the 

sponge ring and Dust and/or grease

environment reflect IR light

Interfering IR 

sponge ring and the dome cover, or missing foam ring

Dust and/or grease on the dome cover

light leaking into the lens, which caused whitened or foggy image

Page 3: Viditronic IR Reflection Analysis · Possible Causes of IR Reflection Nearby barriers in the environment Loose contact between the spongeringand Dustand/or grease reflect IR light

1. IR Leakage Caused by the Foam Ring• Severe circular reflection  occurs if the foam ring and the dome cover is 

Norm

a gnot attached seamlessly. 

• Users can not see the image clearly i h h i

al Foam Rin

without the Foam ring.

ngFoam

 

Foam Ring Loose

Ring Remoe‐contact

oved

Page 4: Viditronic IR Reflection Analysis · Possible Causes of IR Reflection Nearby barriers in the environment Loose contact between the spongeringand Dustand/or grease reflect IR light

Solution

1. Foam ring shall be required for IR dome camerag q

2. Foam ring and the dome cover shall be attached seamlessly. 

Page 5: Viditronic IR Reflection Analysis · Possible Causes of IR Reflection Nearby barriers in the environment Loose contact between the spongeringand Dustand/or grease reflect IR light

2. IR Leakage Caused by Nearby Barriers

Place a reflection surface (e.g. paper board) at approx 10cm next to the camera

N

at approx. 10cm next to the camera. Although the board is not displayed in the image scene, the reflection still interferes 

No Close B

the image.

arriers

Close BarriersThe safe reflection distance varies according to the focus video sceneaccording to the focus, video scene and shape of the barrier.  

Page 6: Viditronic IR Reflection Analysis · Possible Causes of IR Reflection Nearby barriers in the environment Loose contact between the spongeringand Dustand/or grease reflect IR light

Solution

Pay attention during installation and avoid reflection surface(s) near the IR LED panel of the camerapanel of the camera. 

Page 7: Viditronic IR Reflection Analysis · Possible Causes of IR Reflection Nearby barriers in the environment Loose contact between the spongeringand Dustand/or grease reflect IR light

3. IR Leakage Caused by Dirty Dome Cover

1. Dus

Dom

e

2. Cleasted and Ge Cover

an Dom

e Coreased 

over4. D

uste

3. Greas e d D

ome C

ed Dom

e C Cover

Cover

Page 8: Viditronic IR Reflection Analysis · Possible Causes of IR Reflection Nearby barriers in the environment Loose contact between the spongeringand Dustand/or grease reflect IR light

Analysis

1. Old dome cover with dust and grease, which caused IR reflection at night – the IR light reflects from the dome cover surface to the lens surface  and causes whitened image. 

2.  After  switching to a clean and new dome cover, the clearness of the image recovers and reflection is eliminated. 

3. If you touch the new dome cover with hands to create a greased surface, whitened images can be observed after this operation. Do not do that…

4. Scatter dust on the new dome cover to simulate a camera working under dusty environment. Regional whitened image can be observed on the dusted area. 

Conclusion: Grease is the main cause of dome cover reflection and whitened image, while dust enhances reflection effect regionally. 

Page 9: Viditronic IR Reflection Analysis · Possible Causes of IR Reflection Nearby barriers in the environment Loose contact between the spongeringand Dustand/or grease reflect IR light

Improving Plan 1

Precaution: the clean dome cover shall be protected by films during manufacturing, storage transmission and installation processes and the film shall only be removedstorage, transmission and installation processes, and the film shall only be removed after installation. Currently the protection film is 1cm smaller than the dome cover brim range and shall be enlarged to protect the entire dome bubble. 

Page 10: Viditronic IR Reflection Analysis · Possible Causes of IR Reflection Nearby barriers in the environment Loose contact between the spongeringand Dustand/or grease reflect IR light

Improving Plan 2 – How to Clean

Ho to CleanCle

How to Clean: Clean the dome cover with spraying glass cleaner and

ared with spraying glass cleaner and 

after ½ min. spray with clean water and then gently dry 

Napkin

with clean microfiber cloth. 

Di

Co

Clotirty Dom

e over

th+ Ethanool

Page 11: Viditronic IR Reflection Analysis · Possible Causes of IR Reflection Nearby barriers in the environment Loose contact between the spongeringand Dustand/or grease reflect IR light

Improving Plan 3

Improving by design:S t IR li ht d D i il t th b l IR S d D d iSeparate IR light and Dome cover, similar to the below IR Speed Dome design

No

IR Sn‐IR Speed

Speed Domd D

ome

me

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4. Summary‐ General Improving Plans

Use larger protection film to prevent the dome cover from exposure of dirtyUse larger protection film to prevent the dome cover from exposure of dirty 

environment, and with printed hinting message ‘Remove after installation’.

Training for installers and engineers to avoid environmental reflection caused by 

nearby barriers.

Beware of How to Clean the IR dome cover.

Further researches for other improving designs.