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 How to copy vectors between layers in ImageEn?
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27 Posts

Posted - Sep 08 2019 :  20:00:35  Show Profile  Reply
Hello everyone!

On my system, I apply some filters and lastly I call adaptiveThreshold. From the image with all filters applied, the user draws vectors to identify the objects in the image.

However, I do not want the user to identify the objects in the filtered image, but in the original image.

So when the user draws a vector, such as a line in the original image, it needs to be cloned at exactly the same position in the filtered image that will be hidden.

One solution I thought was to use a layer, where layer 0 would be the original image and layer 1 would be the image with the filters applied.


1) How do I clone the original image into a new layer that has exactly the same dimensions and position as the original image?

2) How do I apply filters only to layer 1 always leaving layer 0 as visible?

3) How do I get vectors drawn on layer 0 to be copied (cloned) to layer 1 in the same position?

Thanks in advance for the help!



4714 Posts

Posted - Sep 10 2019 :  01:13:41  Show Profile  Reply

That should be largely straight forward.

1. You can use:

// Clone layer 0
iLayer := ImageEnView2.LayersAdd( ImageEnView1.Layers[ 0 ].Kind );
ImageEnView2.Layers[ iLayer ].Assign( ImageEnView1.Layers[ 0 ] );

2. ImageEnProc methods are applied to the bitmap of the active layer. If LayersCurrent = 1, then the filter will apply only to layer 1 bitmap

3. Assuming you don't want it is real time, you can do

// Assign layers from one ImageEnView to another (but not background image)
// Note: ImageEnView2.assign( ImageEnView1 ) will assign all content including layers
for I := 1 to ImageEnView1.LayersCount - 1 do
  // Append layer of same time
  iLayer := ImageEnView2.LayersAdd( ImageEnView1.Layers[ i ].Kind );

  // Assign all properties
  ImageEnView2.Layers[ iLayer ].Assign( ImageEnView1.Layers[ i ] );

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