Camera View

On viewing the image it become immediately apparent that the lighting is not ideal in this situation. Even for humans the digital numbers (in this case 77.0) are hard to read.

The first task is to segment the digits from the rest of the scene. Note that there are many ways to accomplish this task and the specific modules you may use may differ from this approach.

To begin our segmentation we need to remove the lighting issue. To do this we use the Adaptive_Threshold module. Adding this module converts the above image to:

The parameters of the adaptive thresholding should be set to approximately the width of one of the digits in order to extract out the digit. We found 20 to be an appropriate window size.

One can easily see that the adaptive threshold does a great job of eliminating any lighting issues and highlights the digits from the background.

But you can notice we've still got some cleanup to do ....