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Required configuration
What's new?
Software setup
Document setup
Launching OMeR
1. making a picture file
2. building a document
3. Computing a document
4. Improving recognition
How to order
Technical information
Problem report
Printable manual

symbol marks changed chapters.


Fourth step 

Improving recognition


When you view or  listen the result of an OMeR computation with Melody/Harmony, you can find some  lacking symbols.

This can be improved.


We are going to see here how to use "areas" to help OMeR in its recognition process.

For example, if OMeR misses an accidental, you can use the Inject tool in
Melody/Harmony to add the accidental at the right place.

But if OMeR does not recognize the time signature, this will disrupt the whole computation because many symbols will be shifted or omitted to match the wrong time signature.
In the same way; some elements like text or dynamics can disrupt OMeR and generate a result that cannot be easily amended using Melody/Harmony.

Reminder : symbols that are recognized by OMeR but removed later in order to match the page setup are displayed in red. Symbols recognized by OMeR but modified later in term of duration are displayed in orange.

To avoid this, we can use substitution areas. An area defines a special behavior of the computation at a given location. Areas are saved along with the document.
You can open the Area palette using "Windows>Area tools"
You can delete all the areas in a page using "Areas>Delete all areas in this page"

This palette provide several editing modes :

add an area

remove an area

move and resize an area

The right part of the window defines all the symbols you can add using the add mode.

  • Disabling area
  • Clefs
  • Note heads
  • Accidentals
  • Numbers
  • Dot
  • Rests
  • Break symbols
  • Ornaments
Use the horizontal scroll bar to browse the symbols.

Tip : To remove quickly an area without switching in remove mode, click the area with the shift key down (or using right mouse button)

Deactivating image parts

If the image include graphics that can disrupt OMeR (lyrics, annotation, dynamics...) they can be removed from the computation by using the

tool, then clicking on page. This part will not be processed.

Helping symbol recognition

Select the symbol in the palette. Then, click the page, keep the mouse button down and define the area. The symbol is displayed in red color, centered on the area. When computing, the computed symbol will be substituted by the one you defined.
Please note, you don't have to adjust accurately the "forced" symbol. Even a very small intersection is sufficient.
On the other hand, you cannot add a symbol where there is nothing on the page, or use an area to change a note pitch.
(See the step by step video tutorial about this topic.)

Helping barline recognition

When a vertical barline is not recognized by OMeR, the two bars will be merged into one.  We can notice this looking at the bar number displayed by OMeR after computation. Generally, when this happens, notes of the two bars cannot fit into only one bar so some notes are removed (displayed in orange).
The best way to avoid this error, is to add a bar line at the right position.
(See the step by step video tutorial about this topic.)

Helping time signature recognition

If the time signature is not correctly recognized, bar duration will be wrong and symbols will be removed (in orange). As we saw in a previous chapter, we can force time signature using the general document setup. We can also use areas to add the right numbers at the right place.
(See the step by step video tutorial about this topic.)

Fine computation adjustment

Some computation setup are pre-adjusted to a medium value, suitable for a majority of scores. The computation palette (Windows>Computation tools) enables to adjust these settings to your score. These adjustments are saved in the document.

Beam width

If beams are not found, particularly with multiple lines, or if OMeR finds beam where there is not, you can adjust this value.
(See the step by step video tutorial about this topic.)

Maximum beam tilt

OMeR do not compute thick lines with a big tilt. You can adjust this value here.

Tip : Video tutorials show you, step by step, many of the basic concepts introduced here : "Windows>Tutorials"


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