raspberryFocus

Small program to focus the lens of a raspberry pi camera without a monitor attached

This program measures how sharp is the image of a raspberry camera, and outouts this to the console.

MeasureFocus tries to give a measure of sharpness of the raspberry camera. This enables you to focus the raspberry camera without the need for a live-view.

How it works

MeasureFocus measures the sharpness by summing all the gradients in the image. This is programmed in python for flexibility, combined with C for speed.

How to install:

1. copy all files to some directory on your raspberry
2. sudo python MDGImageLibSetup.py build
3. sudo python MDGImageLibSetup.py install

How to use:

1. Aim your camera at your target
2. Run 'python focus.py'
3. Change the focus until you find the highest number. There are a few caveats:
   • Try not to change the aim of the camera. The sharpness number is dependend on what it is watching
   • Make sure the lighting conditions do not change while aiming
   • There is always some randomness in the numbers; this is because of noise in the camera

Notes

By default, the program looks at the center of the pi camera. You can change this by alterting the source code in focus.py

0.0 0.33 0.66 1

0.0  0.33   0.66   1
......|......|......
......|......|......
------+------+------ 0.33
......|xxxxxx|......
......|xxxxxx|......
------+------+------ 0.66
......|......|......
......|......|...... 1.00
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