[PD] mean color value of a video grid

[IOhannes m zmoelnig]

hi

vincent rioux wrote:
> 
> pix_video (to read a stream from a webcam e.g.)
> 8 pix_crop (to divide the image)
> pix_snap to take a snapshot as a picture.
> pix_mean_color to compute the mean value.

[pix_snap] is unneeded here: this object will grab the render-buffer 
(what you see in the gemwindow) and make it available as a pix-buf.
the output of [pix_video] is exactly that kind of image that is needed 
by pix_mean_color.


> Moreover would it be possible to compute these values on a more complex 
> shape than a rectangle?

images in Gem are always rectangular.
so there are 2 ways to acchieve what you want:
- make [pix_mean_color] operate on "sub-shapes" of the rectangle image 
(neither currently possible with this object nor planned)
- set the unwanted pixels (those between the bounding rectangle and the 
borders of your more complex form) with a pixel-mask to some constant 
value. the offset you are introducing by this is constant (like the 
surrounding pixels) and can therefore be eliminated.


fmasdr
IOhannes