Feature descriptor for robust facial expression recognition
First Claim
1. A method of generating a feature descriptor for facial expression recognition, the method comprising:
- generating a plurality of gradient based images with different scales and orientations from a facial image;
selecting a portion of an image corresponding to each action unit in each of the plurality of gradient based images;
determining, by a processor, an appearance of at least one facial event in the selected portion of the image using coded appearance values; and
determining a geometry of the at least one facial event in the selected portion of the image using a spin wheel structure to obtain a feature descriptor for each action unit for facial expression recognition.
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Abstract
A method and system for generating a feature descriptor for robust facial expression recognition pre-processes a facial image using a Gaussian filter to smooth the facial image. Then, gradient based images at M scales and N orientations are generated from the pre-processed facial image. Further, a portion of an image corresponding to each action unit is selected from each of the gradient based images. Thereafter, appearance of at least one facial event in the selected portion of the image is captured. Also, a geometry of the at least one facial event in the selected portion of image is determined to obtain a feature descriptor for each action unit for robust facial expression recognition.
16 Citations
17 Claims
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1. A method of generating a feature descriptor for facial expression recognition, the method comprising:
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generating a plurality of gradient based images with different scales and orientations from a facial image; selecting a portion of an image corresponding to each action unit in each of the plurality of gradient based images; determining, by a processor, an appearance of at least one facial event in the selected portion of the image using coded appearance values; and determining a geometry of the at least one facial event in the selected portion of the image using a spin wheel structure to obtain a feature descriptor for each action unit for facial expression recognition. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus comprising:
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a processor; and a memory coupled to the processor, wherein the memory comprises a facial descriptor generation module, wherein the facial descriptor generation module instructs the processor to perform a method comprising; generating a plurality of gradient based images with different scales and orientations from a facial image; selecting a portion of an image corresponding to each action unit in each of the plurality of gradient based images; determining an appearance of at least one facial event in the selected portion of the image using coded appearance values; and determining a geometry of the at least one facial event in the selected portion of the image using a spin wheel structure to obtain a feature descriptor for each action unit for facial expression recognition. - View Dependent Claims (7, 8, 9, 10)
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11. A non-transitory computer-readable storage medium having executable program stored therein, that when executed by a processor of a computing device, cause the computing device to perform the method comprising:
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generating a plurality of gradient based images with different scales and orientations from a facial image; selecting a portion of an image corresponding to each action unit in each of the plurality of gradient based images; determining an appearance of at least one facial event in the selected portion of the image using coded appearance values; and determining a geometry of the at least one facial event in the selected portion of the image using a spin wheel structure to obtain a feature descriptor for each action unit for facial expression recognition. - View Dependent Claims (12, 13, 14, 15)
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16. A method of recognizing a facial expression of an image, the method comprising:
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generating a plurality of gradient-based images from the image; selecting a portion, corresponding to an action unit, from one of the plurality of gradient-based images; determining, by a processor, an appearance of a facial event in the selected portion of the image using coded appearance values; and determining a geometry of the facial event using a spin wheel structure to obtain a feature descriptor for the action unit. - View Dependent Claims (17)
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Specification