How to set line width in face tracking

[sliontc]

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How can I set the line width when draw the rectangle marker in Camshift Face Tracking?

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[blaisexen]

hi there,

as I understand you want to change or set the width or height or the rectangle?
if that, then here's the simplest sample I have,
http://www.mediafire.com/file/acyn37hihqodm3q/Accord.Face_Detection.zip

and here's the link I made an issue,
#456

[sliontc]

Thanks for your reply, but I think you misunderstand me. What I mean is how to set the "line" width, the thickness of the line, not the size of rectangle. Since I want to customize the tracker marker.

[blaisexen]

hi,
I think you should use LineMarker instead of RectanglesMarker?

[sliontc]

Actually, I have tried. But no result.

[sliontc]

public static void Polyline(UnmanagedImage image, List points, Color color);
The definition is not mentioned about the line width.

[blaisexen]

Ok,
would you send your code of face detection project.

[cesarsouza]

Hi @sliontc,

At this moment the RectanglesMarker class doesn't offer a width property to achieve this. However, adding support for this shouldn't be too difficult - if you are interested, I would accept pull requests implementing this change.

If you need to make only horizontal or vertical lines thicker (i.e. the borders of a rectangle), then the implementation should be straightforward. If, however, you would need to make lines at arbitrary angles thicker, then it would not be as simple.

But for the first case, maybe we can do as following:

• First, we add a new overload for the Rectangle method in the Drawing class that can accept a width parameter:

  public static void Rectangle(UnmanagedImage image, Rectangle rectangle, Color color, int width)

• Then, we can reuse almost exactly the same code as the original Rectangle function, except for the last part. In this part, instead of calling Line to do the job of drawing the lines on the image, we should change it to use FillRectangle, passing the rectangles that would represent the boundaries of the thick line we intend to draw (a thick line is just a very narrow and long rectangle).
• Then, we will just have to add a new property to the RectanglesMarker class to register the width and call the new Rectangle overload we have just created instead of the previous one.

Regards,
Cesar

[sliontc]

Great thanks for your tips. I will try to pull request.

[sliontc]

@cesarsouza I just submit a pull request.