Methods and apparatus to perform image classification based on pseudorandom features

1. A method comprising:

generating first and second pseudorandom numbers;

extracting a first feature of an image based on the first and second pseudorandom numbers, wherein extracting the first feature of the image comprises:

identifying a location of a region of the image based on the first and second pseudorandom numbers; and

computing an average of pixels of the identified region;

determining whether a classification for the image is known; and

in response to a known classification of the image, updating a classification model used to classify a second image.

2. A method as defined in claim 1 , wherein generating the first pseudorandom number further comprises:

resetting a pseudorandom number generation seed;

generating a pseudorandom number sequence using the pseudorandom number generation seed; and

selecting the first pseudorandom number from the pseudorandom number sequence.

3. A method as defined in claim 1 , further comprising:

in response to an unknown classification of the image:

forming an image feature vector based on the first feature;

scaling the image feature vector with one or more classification parameters; and

classifying the image based on the scaled image feature vector.

4. A method as defined in claim 3 , wherein classifying the image further comprises:

providing the first feature into a support vector machine, wherein the support vector machine determines in which identified location the first feature is located; and

classifying the image based on the support vector machine determination.

5. A method as defined in claim 1 , wherein the classification comprises a gender of a person.

6. A method as defined in claim 1 , wherein extracting the first feature further comprises:

computing at least one of a distance between eyes, a dimension of an area defined by eyes and a nose, or a mouth dimension.

7. A method as defined in claim 1 , wherein updating the classification model further comprises updating one or more image vector scale factors.

8. A method as defined in claim 1 , wherein updating the classification model further comprises updating one or more classification hyperplanes.

9. An apparatus comprising:

a pseudorandom number generator to generate one or more pseudorandom numbers;

a feature extractor to extract a first feature of an image based on the one or more pseudorandom numbers by identifying a region of the image based on the one or more pseudorandom numbers and computing an average of pixels of the identified region;

an image classifier to determine whether a classification for the image is known, and in response to a known classification of the image, updating one or more classification parameters, wherein the one or more classification parameters are used to classify a second image.

10. An apparatus as defined in claim 9 , wherein the pseudorandom number generator is to:

reset a pseudorandom number generation seed;

generate a pseudorandom number sequence using the pseudorandom number generation seed; and

select the first pseudorandom number from the pseudorandom number sequence.

11. An apparatus as defined in claim 9 , wherein the feature extractor is to compute at least one of a distance between eyes, a dimension of an area defined by eyes and a nose, or a mouth dimension.

12. An apparatus as defined in claim 9 , wherein the image classifier is to update one or more image vector scale factors.

13. An apparatus as defined in claim 9 , wherein, in response to an unknown classification of the image, the image classifier is to:

form an image feature vector based on the first feature;

scale the image feature vector with one or more classification parameters; and

classify the image based on the scaled image feature vector.

14. An apparatus as defined in claim 13 , wherein the image classifier is to:

determine in which identified location the first feature is located; and

classify the image based on the determination.

15. A tangible computer readable storage device or storage disc comprising machine-readable instructions which, when executed, cause a machine to at least:

generate one or more pseudorandom numbers;

extract a first feature of an image based on the one or more pseudorandom numbers by identifying a region of the image based on the one or more pseudorandom numbers and computing an average of pixels of the identified region;

determine whether a classification for the image is known; and

in response to a known classification of the image, update one or more classification parameters, wherein the one or more classification parameters are used to classify a second image.

16. A tangible computer readable storage device or storage disc as defined in claim 15 , wherein the instructions further cause the machine to:

reset a pseudorandom number generation seed;

generate a pseudorandom number sequence using the pseudorandom number generation seed; and

select the first pseudorandom number from the pseudorandom number sequence.

17. A tangible computer readable storage device or storage disc as defined in claim 15 , wherein the instructions further cause the machine to:

to compute at least one of a distance between eyes, a dimension of an area defined by eyes and a nose, or a mouth dimension.

18. A tangible computer readable storage device or storage disc as defined in claim 15 , wherein the instructions further cause the machine to:

to update one or more image vector scale factors.

19. A tangible computer readable storage device or storage disc as defined in claim 15 , wherein the instructions further cause the machine to:

form an image feature vector based on the first feature;

scale the image feature vector with one or more classification parameters; and

classify the image based on the scaled image feature vector.

20. A tangible computer readable storage device or storage disc as defined in claim 19 , wherein the instructions further cause the machine to:

determine in which identified location the first feature is located; and

classify the image based on the determination.