NONLINEAR SCALING IN VIDEO CONFERENCING

• US 20160255306A1
• Filed: 05/10/2016
• Published: 09/01/2016
• Est. Priority Date: 02/25/2013
• Status: Active Grant

• Current Assignee: Williams, Herold
• Original Assignee: Williams, Herold
• Inventors: Williams, Herold
• Granted Patent: US 9,667,914 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06T 2200/16 involving adaptation to the client's capabilities
• CPC Class Codes: G06T 2207/10016 Video; Image sequence
• CPC Class Codes: G06T 2207/30196 Human being; Person
• CPC Class Codes: G06T 3/40 Scaling of whole images or parts thereof, e.g. expanding or contracting
• CPC Class Codes: G06T 3/4092 Image resolution transcoding, e.g. by using client-server architectures
• CPC Class Codes: H04N 1/387 Composing, repositioning or otherwise geometrically modifying originals
• CPC Class Codes: H04N 7/147 Communication arrangements, e.g. identifying the communication as a video-communication, intermediate storage of the signals selecting H04Q
• CPC Class Codes: H04N 7/15 Conference systems
• CPC Class Codes: H04N 7/152 Multipoint control units therefor

Abstract

A method for video teleconferencing comprises receiving a starting image with a number of rows and a number of columns. The starting image is downscaled with a dual-axis warping function to create a scaled image with a number of rows fewer than the number of rows of the starting image and a number of columns fewer than the number of columns in the starting image. Then, a transmission image is created from the scaled image.

Claims

1. A method for video teleconferencing, the method comprising:

receiving a starting image with a number of rows and a number of columns;

down-scaling, with a processor, the starting image to create a scaled image with a number of rows fewer than the number of rows of the starting image and a number of columns fewer than the number of columns in the starting image, wherein the down-scaling includes a dual-axis warping; and

creating a transmission image from the scaled image.

2. The method of claim 1 further including:

compressing the transmission image; and

transmitting the compressed transmission image.

3. The method of claim 2, wherein:

compressing the transmission image includes compressing the transmission image with a codec; and

down-scaling the starting image includes down-scaling the starting image independently of the codec.

4. The method of claim 1 further including:

transmitting the transmission image;

receiving the transmitted transmission image;

creating a down-scaled image from the received transmission image;

up-scaling the down-scaled image to create a first up-scaled image; and

displaying the up-scaled image.

5. The method of claim 4 further including:

compressing the transmission image with a first codec, wherein the compressing occurs after the down-scaling; and

decompressing the received transmission image with a second codec, wherein the decompressing occurs before the up-scaling.

6. The method of claim 4, wherein:

down-scaling the first starting image further includes down-scaling the starting image with a nonlinear down-scaling equation; and

up-scaling the first down-scaled image further includes up-scaling the down-scaled image using an inverse of the nonlinear down-scaling equation.

7. The method of claim 1, wherein:

performing dual-axis scaling on the starting image occurs concurrently with down-scaling the starting image.

8. The method of claim 1, wherein:

performing dual-axis scaling on the starting image occurs serially to down-scaling the starting image.

9. The method of claim 1, wherein:

down-scaling the starting image includes down-scaling the starting image to create the first scaled image with a number of rows equal to half of the number of rows of the first starting image.

10. A computer readable storage device with an executable program for video teleconferencing stored thereon, wherein the program instructs a processor to perform:

receiving a starting image with a number of rows and a number of columns;

down-scaling, with a processor, the starting image to create a scaled image with a number of rows fewer than the number of rows of the starting image and a number of columns fewer than the number of columns in the starting image, wherein the down-scaling includes a dual-axis warping; and

creating a transmission image from the scaled image.

11. The computer readable storage device of claim 10 further including:

compressing the transmission image; and

transmitting the compressed transmission image.

12. The computer readable storage device of claim 11, wherein:

compressing the transmission image includes compressing the transmission image with a codec; and

down-scaling the starting image includes down-scaling the starting image independently of the codec.

13. The computer readable storage device of claim 10 further including:

transmitting the transmission image;

receiving the transmitted transmission image;

creating a down-scaled image from the received transmission image;

up-scaling the down-scaled image to create a first up-scaled image; and

displaying the up-scaled image.

14. The computer readable storage device of claim 13 further including:

compressing the transmission image with a first codec, wherein the compressing occurs after the down-scaling; and

decompressing the received transmission image with a second codec, wherein the decompressing occurs before the up-scaling.

15. The computer readable storage device of claim 13, wherein:

down-scaling the first starting image further includes down-scaling the starting image with a nonlinear down-scaling equation; and

up-scaling the first down-scaled image further includes up-scaling the down-scaled image using an inverse of the nonlinear down-scaling equation.

16. The computer readable storage device of claim 10, wherein:

performing dual-axis scaling on the starting image occurs concurrently with down-scaling the starting image.

17. The computer readable storage device of claim 10, wherein:

performing dual-axis scaling on the starting image occurs serially to down-scaling the starting image.

18. The computer readable storage device of claim 10, wherein:

down-scaling the starting image includes down-scaling the starting image to create the first scaled image with a number of rows equal to half of the number of rows of the first starting image.