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ESPHome Feature Request Tracker
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ESP32 Camera Color Picker #844

Open hansjochensen opened 4 years ago

hansjochensen commented 4 years ago

Describe the problem you have/What new integration you would like

I want to read the single RGB or the luminance values of a specified pixel of an ESP32 camera picture directly within ESPhome, similar to a Color Picker. Provide a pixel coordinate (x,y) and get one of the RGB values in return. Please describe your use case for this integration and alternatives you've tried:

I read my 3-phase Ferres power meter by detecting the red section of the revolving disk inside. My trials with luminance and RGB boards were not successful. Instead I installed an ESP32 Camera to detect the red stripe. It works fine, but is cumbersome and not suitable for higher power consumption. My current approach inside Home Assistant: Crop the camera image at the ROI to 1 pixel and save it every second as a jpg file. Read the byte containing the DC-part of the FFT luminance encoding with a commandline sensor using tail and hexdump. The sensor value varies sufficiently enough to detect a complete resolution of the disk, which is in my case equivalent to the consumption of 8 Watt. Additional context

Such a feature would allow an ESP32 camera to act as a generic sensor in other application domains too.

hansjochensen commented 4 years ago

Shown are the original image and three cop results. The red pixel is detected and increases the revolutions counter. ferres

JeeCee1 commented 4 years ago

Hi Hans, what an awesome solution! Os your code online?