Sometimes it is difficult to set-up a suitable backdrop and stand to allow automatic masking to work well (for example the stand may need to be a different colour to the backdrop). However completely manual masking can be tedious and error-prone.
3DSOM Pro provides a semi-automatic tool to make manual masking easier. The new "Magic Highlighter" tool allows you to quickly highlight the edges of the object using a wide "highlight" pen and 3DSOM Pro will refine the edge to get the precise mask.
Remove any existing mask using the Edit Masks toolbar. button from the
Select the button to enter "Magic Highlighter" mode. You will see the following popup tool palette...
Initially the button is selected so that the paint mode is set to apply the magic highlighter.
The button should be used to unpaint areas you previously marked with the magic highlighter.
The button refines the edge and display the resulting mask displayed previewed as a solid colour. Clicking on the image or a button will hide the preview and return to the edge highlighting display.
To correct this, you should select a small brush size and the button. Then unpaint an area inside the hole so that 3DSOM Pro can grow the hole up to the highlighted edges.
|Figure 4.2.4. Left: closeup with part of hole unpainted, Right: resulting mask correctly shows the hole region|
You can use the highlighter and unpaint tools to refine the results. For example if a dot from the calibration targets is visible in your previewed mask, you can unpaint part of the dot so that it is no longer included as shown below:
|Figure 4.2.6. Left: Refined highlighted region with dot partially unpainted, Right: Resulting mask is fixed|
3DSOM Pro also includes a shrinkwrap tool that allows a rough sketch containing a painted area completely outside the object to be "shrinkwrapped" onto the object. Note that this contrasts with the "Magic Highlighter" where the area painted should include the true boundary.
The outline can be very rough but make sure you don't touch the object you are trying to mask. If there are holes in the object shape you can also paint inside these areas to help the masking process.
Hit the button and drag the masking slider to interactively shrink-wrap the mask. Move the slider to the right to create more mask colour and to the left to create less mask colour.
For finer control you can modify the shrink-wrap threshold in a rectangular region of the image. Simply click the button. Then select the desired image region by dragging with the left mouse button. Now drag the masking slider to interactively set the threshold for the selected region only.
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