Detection of opposite voices

[kulisak12]

I was transcribing a score that has two voices per staff, using notes of opposite directions.
When the voices are close to each other, Audiveris often only detects one of them.

I tried searching the constants for some penalties that may come into play, but I did not manage to get better results.
Do you have any idea why this is happening?

Files to reproduce:

• small example from above
• larger scan where the detection fails in many different cases

[hbitteur]

@kulisak12
Strictly speaking, in this example, the un-recognized notes are not "close to each other". We have one single note head shared by two opposite chord stems.
This canonical configuration is called "shared heads" and described in this handbook section.

To my knowledge, the OMR engine should be able to detect this case. I will check your examples.