CLIAMS:We claim:
1. A method for determining emotions of a user using a camera, the method comprising:
receiving, by a processor of an emotion detection system, at least one image of the user from the camera;
detecting, by the processor, at least one region of interest of the user in the at least one image;
generating, by the processor, a video plethysmographic waveform by analyzing the at least one region of interest;
determining, by the processor, at least one physiological characteristic based on the video plethysmographic waveform; and
determining, by the processor, the emotions of the user by comparing the at least one physiological characteristic with predefined physiological characteristics defined for each emotion.

2. The method as claimed in claim 1, wherein the region of interest comprises uncovered body parts of the user.

3. The method as claimed in claim 1, wherein the at least one physiological characteristic comprises at least one of a peripheral capillary oxygen saturation (SPO2), a respiratory rate, and a heart rate of the user.

4. The method as claimed in claim 1, wherein the video plethysmographic waveform is generated based on pixel variations of the image, corresponding to each of the at least one region of interest.

5. The method as claimed in claim 1, wherein the emotions of the user is one of happiness, sadness, fear, anger, surprise and disgust.

6. The method as claimed in claim 1, wherein the predefined physiological characteristics defined for the each emotion are updated based on a feedback received on the emotions determined for the user.

7. An emotion detection system for determining emotions of a user using a camera comprising:
a processor;
a memory communicatively coupled to the processor, wherein the memory stores processor-executable instructions, which, on execution, cause the processor to:
receive at least one image of the user from the camera;
detect at least one region of interest of the user in the at least one image;
generate a video plethysmographic waveform by analyzing the at least one region of interest;
determine at least one physiological characteristic based on the video plethysmographic waveform; and
determine the emotions of the user by comparing the at least one physiological characteristic with predefined physiological characteristics defined for each emotion.

8. The emotion detection system as claimed in claim 7, wherein the region of interest comprises uncovered body parts of the user.

9. The emotion detection system as claimed in claim 7, wherein the at least one physiological characteristic comprises at least one of a peripheral capillary oxygen saturation (SPO2), a respiratory rate, and a heart rate of the user.

10. The emotion detection system as claimed in claim 7, wherein the video plethysmographic waveform is generated based on pixel variations of the image, corresponding to each of the at least one region of interest.

11. The emotion detection system as claimed in claim 7, wherein the emotions of the user is one of happiness, sadness, fear, anger, surprise and disgust.

12. The emotion detection system as claimed in claim 7, wherein the predefined physiological characteristics defined for the each emotion are updated based on a feedback received on the emotions determined for the user.

13. A non-transitory computer readable medium including instructions stored thereon that when processed by a processor cause an emotion detection system for determining emotions of a user using a camera by performing acts of:
receiving at least one image of the user from the camera;
detecting at least one region of interest of the user in the at least one image;
generating a video plethysmographic waveform by analysing the at least one region of interest;
determining at least one physiological characteristic based on the video plethysmographic waveform; and
determining the emotions of the user by comparing the at least one physiological characteristic with predefined physiological characteristics defined for each emotion.

Dated this 27th day of June, 2015

SHWETHA A CHIMALGI
OF K & S PARTNERS
AGENT FOR THE APPLICANT
,TagSPECI:FIELD OF THE DISCLOSURE
The present subject matter is related, in general to human behavior detection, and more particularly, but not exclusively to emotion detection system and method for determining emotions of a user using a camera.