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A method is described to precisely and quickly focus a video camera on any 2 or 3 dimensional image or scene during real time digital image capture.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
73% of the total text.
Page 1 of 1
Focus Window for Real Time Digital Image Capture
A method is described to precisely and quickly focus a video camera on any
2 or 3 dimensional image or scene during real time digital image capture.
When capturing a video image using a standard NTSC or RGB camera, one
of the difficulties often encountered is focusing the camera quickly and accurately
on a given subject. Many times the image is of low definition or contrast and,
when viewed though the camera or on a display monitor (some low cost cameras
do not have "through the lens" viewfinders), is very difficult to precisely focus in a
timely manner. In other cases, the image being captured is from a 3-dimensional
source (live), and focusing also becomes a problem of trying to select the image
plane (near or far objects in the actual scene) or area (as displayed on a monitor
in 2 dimensions) to focus on.
The method described provides a manual or automatic placement of a focus
area or window on the display monitor that will identify a sub-section of the image
on which to concentrate an image focus algorithm.
In manual placement, the size and location of this window can be varied over
the image by the operator as required to select the desired focus area and is
overlayed (simultaneously displayed) on the actual image to indicate location.
Once positioned, a focus algorithm calculates (from the focus window) and
displays an indication of "nearness to focus" in real time as the operator adjusts
the camera focus rin...