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System and method of real time insertions into video using adaptive occlusion with a synthetic reference image
| Details |
Inventors: Astle, Brian; Das, Subhodev;
Assignee: Princeton Video Image, Inc. (Lawrenceville, NJ)
Primary Examiner: Flynn; Nathan
Assistant Examiner: Srivastava; Vivek
Attorney, Agent or Firm: Woodbridge & Associates
A system and method for realtime occlusion processing for seamlessly and realistically blending an inserted image such as an advertisement into a region of a live broadcast image without obscuring the action of the live image. The average color and intensity of a synthetic reference image containing at least some of the region to be replaced is compared to the average color and intensity of the current live broadcast image to determine the difference between the two images. The resulting difference image obtained from processing the current image and synthetic, reference image determines areas of the intended insertion region within the current image which are obscured by live action. The processor then generates an occlusion mask based on the difference image and only those pixels that are unoccluded within the intended insertion region are allowed to be inserted into the live broadcast. |
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DETAILED DESCRIPTION The invention comprises a method of real time insertion of a video image into a live video broadcast using adaptive occlusion with a synthetic reference image.
This system is usable in varying light conditions, and allows insertion with occlusion on surfaces which are reasonably uniform in color and texture, such as tennis courts, the wall behind home plate on a baseball field, or even grass or turf on a soccer or football stadium.
The present application utilizes the term reference image in a different manner from the following previous related applications: U.
S.
Provisional Application No.
60/000,279 filed Jun.
16, 1995 entitled "APPARATUS AND METHOD OF INSERTING IMAGES INTO TELEVISION DISPLAYS"; U.
S.
patent application Ser.
No.
08/563,598 filed Nov.
28, 1995 entitled "SYSTEM AND METHOD FOR INSERTING STATIC AND DYNAMIC IMAGES INTO A LIVE VIDEO BROADCAST"; U.
S.
patent application Ser.
No.
08/381,088 filed Jan.
31, 1995 entitled "LIVE VIDEO INSERTION SYSTEM"; and U.
S.
patent application Ser.
No.
08/580,892 filed Dec.
29, 1995 entitled "METHOD OF TRACKING SCENE MOTION FOR LIVE VIDEO INSERTION SYSTEMS".
In those applications the term reference image was used to describe a collection of coordinate values which signified the conditions of a playing field absent game action and occlusion due to game action.
This coordinate representation is also, more properly, called the reference array and is merely a geometric, coordinate-framework used in searching, tracking and placing an advertisement or other indicia into a live broadcast.
In this sense the reference image is merely a convenience to help the operator relate to the reference array.
However, in the occlusion processing of the present invention, the system operates on a modified actual image taken prior to the game which is also referred to as the reference image.
The image used in occlusion processing is more properly called the occlusion reference image.
In the occlusion processing described herein, the occlusion reference image is operated on prior to use by the system, through spatial-filtering, or by the operator manually adjusting pixel values in various regions using well known software tools to generate a simplified variant of the occlusion reference image, properly referred to as a synthetic occlusion reference image
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Ring Tones 
