UPDATING A MODEL OF A PARTICIPANT OF A THREE DIMENSIONAL VIDEO CONFERENCE CALL

1 . A method for updating a model of a participant of a three dimensional (3D) video conference, the method comprises:

obtaining images of the participant during the 3D video conference;

determining, by a change detector and based on the images, whether one or more captured expressions of the participant are modeled properly by a model of the participant, the model of the participant is accessible to a participant device;

sending one or more captured expressions information to a computerized system other than the participant device, wherein the sending is executed under privacy restrictions, and when determining that the one or more captured expressions are not modeled properly by the model of the participant; and

receiving from the computerized system an updated model of the user.

2 . The method according to claim 1 , wherein the model of the user was generated based on training expressions, wherein the one of more captured expressions are not modeled properly when they differ from the training expressions.

3 . The method according to claim 1 , wherein the one or more captured expressions information comprises one or more images that captured the one or more captured expressions.

4 . The method according to claim 3 , wherein the privacy restrictions restrict a number of one or more images sent to the computerized system.

5 . The method according to claim 3 , wherein the privacy restrictions restrict information embedded in the one or more images sent to the computerized system.

6 . The method according to claim 3 , wherein the privacy restrictions prevent sending one or more images that enable a reconstruction of a content of the 3D video conference.

7 . The method according to claim 1 , comprising determining one or more parameters of the one or more captured expressions; wherein the determining of whether the one or more captured expressions of the participant are modeled properly is based on values of the one or more parameters.

8 . The method according to claim 7 , wherein the one or more captured expressions information comprises the one or more parameters.

9 . A non-transitory computer readable medium for updating a model of a participant of a three dimensional (3D) video conference, the non-transitory computer readable medium stores instructions that once executed by a processing circuit cause the processing circuit to execute steps, the steps comprising:

obtaining images of the participant during the 3D video conference;

determining, by a change detector and based on the images, whether one or more captured expressions of the participant are modeled properly by a model of the participant, the model of the participant is accessible to a participant device;

sending one or more captured expressions information to a computerized system other than the participant device, wherein the sending is executed under privacy restrictions, and when determining that the one or more captured expressions are not modeled properly by the model of the participant; and

receiving from the computerized system an updated model of the user

10 . The non-transitory computer readable medium according to claim 9 , wherein the model of the user was generated based on training expressions, wherein the one of more captured expressions are not modeled properly when they differ from the training expressions.

11 . The non-transitory computer readable medium according to claim 9 , wherein the one or more captured expressions information comprises one or more images that captured the one or more captured expressions.

12 . The non-transitory computer readable medium according to claim 11 , wherein the privacy restrictions restrict a number of one or more images sent to the computerized system.

13 . The non-transitory computer readable medium according to claim 11 , wherein the privacy restrictions restrict information embedded in the one or more images sent to the computerized system.

14 . The non-transitory computer readable medium according to claim 11 , wherein the privacy restrictions prevent sending one or more images that enable a reconstruction of a content of the 3D video conference.

15 . The non-transitory computer readable medium according to claim 9 , that stores instructions for determining one or more parameters of the one or more captured expressions; wherein the determining of whether the one or more captured expressions of the participant are modeled properly is based on values of the one or more parameters.

16 . The non-transitory computer readable medium according to claim 15 , wherein the one or more captured expressions information comprises the one or more parameters.

17 . A computerized system non-transitory computer readable medium for updating a model of a participant of a three dimensional (3D) video conference, the non-transitory computer readable medium stores instructions that once executed by a processing circuit cause the processing circuit to execute steps, the steps comprising:

obtaining a non-riggable model of the face of the person;

performing a first approximation process that comprises generating an intermediate variable model that approximates the non-riggable model, using an interactive variable model infrastructure; wherein the generating comprises iteratively changing shape parameters of the intermediate model until fulfilling a proximity condition; and

performing a second approximation process that comprises generating the variable model, by iteratively modifying vertices.