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Update ROI-Configuration.md

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2023-01-08 13:36:18 +01:00
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@@ -18,8 +18,17 @@ Please proceed in the following order!
Don't forget to save after each step!
### Image Sharpness
Ensure a sharp image of the camera by adjusting the focal length of the ESP OV2640 camera.
**Adjust the focus for the clearest possible image** See [these instructions](https://github.com/jomjol/water-meter-picture-provider/blob/master/ESP32-CAM_Lens_Modification.md) for help.
Ensure a sharp image of the camera by adjusting the focal length of the ESP OV2640 camera. **Adjust the focus for the clearest possible image!**
In order to use it for reading a meter, the focal-length of the OV2640 camera has to be manipulated, as by default it only results in sharp image for distance bigger than ~40cm, causing the image of the water meter to be too small for automated readout processing.
**ATTENTION:** this modification will void any warranty, as the sealing of the lens objective is broken!
**ATTENTION:** This modification will render the camera unsuitable for general, web-cam type applications unless the focal length is changed back to the original setting.
![](img/focus_adjustment.jpg)
Remove the fixing glue of the OV2640 lens with a sharp knife. After this you can screw the lens in and out. Rotating it by about a quarter of a turn counterclockwise results in a focus plane of about 10cm. You need to figure out your best setting with a little bit of trial and error for your specific environment.
### Horizontal Alignment
Ensure an **exact horizontal alignment** of the number via the alignment / reference setup:
@@ -71,4 +80,3 @@ Here an example:
| :heavy_check_mark: **Okay** | <img width="125" alt="dig-class100_OK" src="https://user-images.githubusercontent.com/412645/199028380-7623776e-59b9-4356-ab55-3852253609df.png"> |
| :x: **Not** Okay | <img width="125" alt="dig-class100_NOK" src="https://user-images.githubusercontent.com/412645/199028469-3a69ed31-e5c9-4038-a8dc-6d44a42437ed.png"> |