Methods and apparatus to capture photographs using mobile devices
View Patent ↗Methods and apparatus to capture photographs using mobile devices are disclosed. An example apparatus includes a photograph capturing controller to capture a photograph with a mobile device. The apparatus further includes a blurriness analyzer to determine a probability of blurriness of the photograph. The example apparatus also includes a photograph capturing interface to prompt a user to capture a new photograph when the probability of blurriness exceeds a blurriness threshold.
1. An apparatus comprising:
a photograph capturing controller to capture a first photograph with a mobile device;
a blurriness analyzer to determine a probability of blurriness of the first photograph at a time when the first photograph is captured, the probability of blurriness based on an analysis of a subset of multiple areas of the first photograph, the subset excluding a region of the first photograph associated with an auto-focus operation of the mobile device; and
a photograph capturing interface to prompt a user, prior to displaying the first photograph to the user, to capture a new photograph to replace the first photograph when the probability of blurriness exceeds a blurriness threshold.
2. The apparatus of claim 1 , wherein the blurriness analyzer is to determine the probability of blurriness by:
applying an edge detection filter to the first photograph;
identifying pixels having a pixel value above a pixel value threshold;
estimating a variance of pixel values corresponding to the identified pixels within a first area of the multiple areas of the first photograph, the variance of the pixel values is a first variance of a plurality of variances of the pixel values, the first variance associated with the first area of the first photograph; and
determining the probability of blurriness based on the estimated variance.
3. The apparatus of claim 2 , wherein the blurriness analyzer is to determine the probability of blurriness by applying a logistic model to the plurality of variances of the pixel values corresponding to the multiple areas of the first photograph.
4. The apparatus of claim 1 , wherein the blurriness analyzer is to divide the first photograph into the multiple areas.
5. The apparatus of claim 4 , wherein the multiple areas within the subset are spaced apart from a central region of the first photograph.
6. The apparatus of claim 4 , wherein the multiple areas within the subset are adjacent sides of the first photograph.
7. The apparatus of claim 1 , further including, when the probability of blurriness exceeds the blurriness threshold, a communications interface to transmit the new photograph without the first photograph to a data collection facility.
8. A non-transitory computer readable medium comprising instructions that, when executed, cause a mobile device to at least:
capture a first photograph;
determine a probability of blurriness of the first photograph at a time when the first photograph is captured, the probability of blurriness based on an analysis of a subset of multiple areas of the first photograph, the subset excluding a region of the first photograph associated with an auto-focus operation of the mobile device; and
prompt a user, before displaying the first photograph, to capture a new photograph to replace the first photograph when the probability of blurriness exceeds a blurriness threshold.
9. The non-transitory computer readable medium of claim 8 , wherein the instructions further cause the mobile device to determine the probability of blurriness by:
applying an edge detection filter to the first photograph;
identifying pixels having a pixel value above a pixel value threshold;
estimating a variance of pixel values corresponding to the identified pixels within a first area of the multiple areas of the first photograph, the variance of the pixel values is a first variance of a plurality of variances of the pixel values, the first variance associated with the first area of the first photograph; and
determining the probability of blurriness based on the estimated variance.
10. The non-transitory computer readable medium of claim 9 , wherein the instructions are further to cause the mobile device to determine the probability of blurriness by applying a logistic model to the plurality of variances of the pixel values corresponding to the multiple areas of the first photograph.
11. The non-transitory computer readable medium of claim 8 , wherein the instructions are further to cause the mobile device to divide the first photograph into the multiple areas.
12. The non-transitory computer readable medium of claim 11 , wherein the multiple areas within the subset are spaced apart from a central region of the first photograph.
13. The non-transitory computer readable medium of claim 11 , wherein the multiple areas within the subset are adjacent sides of the first photograph.
14. The non-transitory computer readable medium of claim 8 , wherein, when the probability of blurriness exceeds the blurriness threshold, the instructions are further to cause the mobile device to transmit the new photograph to a data collection facility, and not to transmit the first photograph to the data collection facility.
15. A method comprising:
capturing, by executing an instruction with a processor, a first photograph with a mobile device;
determining, by executing an instruction with the processor, a probability of blurriness of the first photograph at a time when the first photograph is captured, the probability of blurriness based on an analysis of a subset of multiple areas of the first photograph, the subset excluding a region of the first photograph associated with an auto-focus operation of the mobile device; and
prompting, by executing an instruction with the processor, a user to capture a new photograph to replace the first photograph when the probability of blurriness exceeds a blurriness threshold, the prompting occurring before the first photograph is displayed to the user.
16. The method of claim 15 , wherein the determining of the probability of blurriness includes:
applying an edge detection filter to the first photograph;
identifying pixels having a pixel value above a pixel value threshold;
estimating a variance of pixel values corresponding to the identified pixels within a first area of multiple areas of the first photograph, the variance of the pixel values is a first variance of a plurality of variances of the pixel values, the first variance associated with the first area of the first photograph; and
determining the probability of blurriness based on the estimated variance.
17. The method of claim 16 , wherein the determining of the probability of blurriness includes applying a logistic model to the plurality of variances of the pixel values corresponding to the multiple areas of the first photograph.
18. The method of claim 15 , further including dividing the first photograph into the multiple areas.
19. The method of claim 18 , wherein the multiple areas within the subset are spaced apart from a central region of the first photograph.
20. The method of claim 15 , further including, when the probability of blurriness exceeds the blurriness threshold, transmitting the new photograph to a data collection facility without transmitting the first photograph.