Finger sensor apparatus using image resampling and associated methods
View Patent ↗A finger sensor may include a plurality of finger image sensing arrays for generating a respective plurality of finger image data sets based upon sliding finger movement over the finger image sensing arrays, and a processor cooperating with the finger image sensing arrays. The processor may determine finger movement based upon the finger image data sets, and generate a resampled finger image data set by resampling the finger image data sets based upon the determined finger movement. The processor may further deskew the finger image data sets when generating the resampled finger image data set.
1. A finger sensor apparatus comprising:
a plurality of finger image sensing arrays for generating a respective plurality of finger image data sets based upon sliding finger movement over said plurality of finger image sensing arrays; and
a processor cooperating with said plurality of finger image sensing arrays for determining finger movement based upon the plurality of finger image data sets, and for generating a resampled finger image data set by resampling the plurality of finger image data sets based upon the determined finger movement by at least
using the determined finger movement to arrange the plurality of finger image data sets into a single array to thereby generate a supersampled finger image data array having a resolution greater than a resolution of each finger image data set, and
downsampling the supersampled finger image data array to generate a downsampled finger image data array having a resolution lower than the resolution of the supersampled finger image data array and thereby defining the resampled finger image data set.
2. The finger sensor apparatus according to claim 1 wherein said processor further deskews the plurality of finger image data sets when generating the resampled finger image data set.
3. The finger sensor apparatus according to claim 1 wherein said processor scans each of said plurality of finger image sensing arrays so that each finger image data set defines a complete finger image data set.
4. The finger sensor apparatus according to claim 1 wherein said processor determines finger movement based upon identifying and tracking at least one finger feature in each of the plurality of finger image data sets.
5. The finger sensor apparatus according to claim 4 wherein said processor determines finger movement in two dimensions.
6. The finger sensor apparatus according to claim 1 wherein said processor further determines a finger match based upon the resampled finger image data set and a stored finger image data set.
7. The finger sensor apparatus according to claim 1 further comprising a display; and wherein said processor generates a finger image on said display based upon the resampled finger image data set.
8. The finger sensor apparatus according to claim 1 wherein each of said plurality of finger image sensing arrays comprises a linear array of finger image sensing pixels.
9. The finger sensor apparatus according to claim 8 wherein each of said finger image sensing pixels comprises an integrated circuit finger image sensing pixel.
10. The finger sensor apparatus according to claim 1 further comprising a multiplexed data bus connected between said plurality of finger image sensing arrays and said processor.
11. The finger sensor apparatus according to claim 1 wherein said processor is separated from said plurality of finger image sensing arrays.
12. The finger sensor apparatus according to claim 1 wherein at least some adjacent ones of said plurality of finger image sensing arrays are arranged with a nonuniform spacing.
13. An electronic device comprising:
a housing; and
a finger sensor apparatus carried by said housing and comprising
a plurality of finger image sensing arrays for generating a respective plurality of finger image data sets based upon sliding finger movement over said plurality of finger image sensing arrays, each of said plurality of finger image sensing arrays comprising a linear array of integrated circuit finger image sensing pixels, and
a processor cooperating with said plurality of finger image sensing arrays for determining finger movement based upon the plurality of finger image data sets, and for generating a resampled finger image data set by resampling the plurality of finger image data sets based upon the determined finger movement by at least
using the determined finger movement to arrange the plurality of finger image data sets into a single array to thereby generate a supersampled finger image data array having a resolution greater than a resolution of each finger image data set, and
downsampling the supersampled finger image data array to generate a downsampled finger image data array having a resolution lower than the resolution of the supersampled finger image data array and thereby defining the resampled finger image data set.
14. The electronic device according to claim 13 wherein said processor further deskews the plurality of finger image data sets when generating the resampled finger image data set.
15. The electronic device according to claim 13 wherein said processor scans each of said plurality of finger image sensing arrays so that each finger image data set defines a complete finger image data set.
16. The electronic device according to claim 13 wherein said processor determines finger movement based upon identifying and tracking at least one finger feature in each of the plurality of finger image data sets.
17. The electronic device according to claim 13 wherein said processor further determines a finger match based upon the resampled finger image data set and a stored finger image data set.
18. The electronic device according to claim 13 further comprising a display carried by said housing; and wherein said processor generates a finger image on said display based upon the resampled finger image data set.
19. A finger sensing method comprising:
generating, using a processor, a respective plurality of finger image data sets based upon sliding finger movement over a plurality of finger image sensing arrays;
determining, using the processor, finger movement based upon the plurality of finger image data sets; and
generating, using the processor, a resampled finger image data set by resampling the plurality of finger image data sets based upon the determined finger movement by at least
using the determined finger movement to arrange the plurality of finger image data sets into a single array to thereby generate a supersampled finger image data array having a resolution greater than a resolution of each finger image data set, and
downsampling the supersampled finger image data array to generate a downsampled finger image data array having a resolution lower than the resolution of the supersampled finger image data array and thereby defining the resampled finger image data set.
20. The method according to claim 19 wherein generating the resampled finger image data further comprises deskewing the plurality of finger image data sets.
21. The method according to claim 19 wherein the processor scans each of the plurality of finger image sensing arrays so that each finger image data set defines a complete finger image data set.
22. The method according to claim 19 wherein determining finger movement comprises determining finger movement based upon identifying and tracking at least one finger feature in each of the plurality of finger image data sets.
23. The method according to claim 19 further comprising determining a finger match based upon the resampled finger image data set and a stored finger image data set.
24. The method according to claim 19 further comprising generating a finger image on a display based upon the resampled finger image data set.
25. The method according to claim 19 wherein each of the plurality of finger image sensing arrays comprises a linear array of finger image sensing pixels.
26. The method according to claim 25 wherein each of the finger image sensing pixels comprises an integrated circuit finger image sensing pixel.