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CameraWebServer-still

This is a modified version of this Arduino IDE ESP32-CAM CameraWebServer example from:

File/Examples/ESP32/Camera/CameraWebServer

that allows capturing a ESP32-CAM image to a file from the command line.

The steps to use are:

  • put your Wifi SSID and password in CameraWebServer-still.ino
  • compile and upload to the ESP32-CAM in Arduino IDE
  • get the camera web server URL after 'reset' from the Serial Monitor
  • run curl from the command line to capture a single still image:

curl URL/capture >image-file.jpg

Convert the color output jpeg image to grayscale

The camera image software runs only on grayscale images and ESP32-CAM images are color.

  • Build and install the C jpegsrc.vversion.tar.gz library for jpeg image reading/writing.

  • Run with this command to convert the image from color to grayscale:

jpegtran -grayscale -outfile outfile.jpg infile.jpg

camera_capture.sh

This script does both of the above after installing the ijg.org library. It captures an image and converts it to grayscale.

The usage is

./camera_capture.sh URL image-root

where

  • URL is as above
  • image-root is the root of the output filename

and it produces:

  • image-root.jpg is the color image from the capture
  • image-root-gray.jpg is the grayscale version of that image

so running

./camera_capture.sh http://10.33.32.20 image

produces the color image file image.jpg and the grayscale image file image-gray.jpg.

Hardware

This is a good ESP32-CAM board to get. This shows how to hook the board into a computer via micro-USB, download the Arduino IDE to set up the camera. You can then download this software into the Arduino IDE and continue the steps from above.