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I'm trying to extract digits from an analog electricity meter.

I have for example following picture:

I know that the lightning on this picture isn't equal everywhere, but it's really hard to get this equal due to reflection and etc.

When I'm performing Grayscale, Gaussian Blur & Canny Edge on this image, I can't get a decent result. The issue is that I either have to put the Canny Edge treshold too high which causes some digits unreadable or either have to put the Canny Edge treshold too low which causes too much details to be included in the image.

Example of too high treshold:

Code: Imgproc.Canny(image, imgCanny, 60, 60/3);

Example of too low treshold:

Code: Imgproc.Canny(image, imgCanny, 35, 50/3);

Is there any way to perform some kind of 'Adaptive Treshold Canny Edge' on this? Thanks!

I'm trying to extract digits from an analog electricity meter.

I have for example following picture:

I know that the lightning on this picture isn't equal everywhere, but it's really hard to get this equal due to reflection and etc.

When I'm performing Grayscale, Gaussian Blur & Canny Edge on this image, I can't get a decent result. The issue is that I either have to put the Canny Edge treshold too high which causes some digits unreadable or either have to put the Canny Edge treshold too low which causes too much details to be included in the image.

Example of too high treshold:

Code: Imgproc.Canny(image, imgCanny, 60, 60/3);

Example of too low treshold:

Code: Imgproc.Canny(image, imgCanny, 35, 50/3);35/3);

Is there any way to perform some kind of 'Adaptive Treshold Canny Edge' on this? Thanks!

I'm trying to extract digits from an analog electricity meter.

I have for example following picture:

I know that the lightning on this picture isn't equal everywhere, but it's really hard to get this equal due to reflection and etc.

When I'm performing Grayscale, Gaussian Blur & Canny Edge on this image, I can't get a decent result. The issue is that I either have to put the Canny Edge treshold too high which causes some digits unreadable or either have to put the Canny Edge treshold too low which causes too much details to be included in the image.

Example of too high treshold:

Code: Imgproc.Canny(image, imgCanny, 60, 60/3);

Example of too low treshold:

Code: Imgproc.Canny(image, imgCanny, 35, 35/3);

Is there any way to perform some kind of 'Adaptive Treshold Canny Edge' on this? Thanks!