What is claimed is:
1. A method of discriminating a latent fingerprint residual on an imaging surface of an optical fingerprint input apparatus, which acquires a fingerprint image by an backlight illuminated onto a fingerprint and reflected therefrom, the method comprising the steps of:
acquiring an image without illuminating the backlight onto the imaging surface;
detecting an existence of a fingerprint from the acquired image; and
discriminating the fingerprint, if detected, to be a latent fingerprint detected due to an external light.
2. The method of claim 1, wherein the step of acquiring an image is performed by receiving an entire screen of an image.
3. The method of claim 1, wherein the step of acquiring an image is performed by receiving only a part of an image from the tip thereof.
4. The method of claim 1, wherein the step of acquiring an image is performed by receiving only a part of an image by using a windowing function of an image sensor.
5. The method of any one of claims 1 to 4, wherein the step of detecting an existence of a fingerprint comprises the sub-steps of:
calculating a sum of differences between gray levels of adjacent pixels of the acquired image on an X axis or a Y axis of a coordinate;
comparing the calculated sum of the gray levels with a pre-set reference value; and
discriminating that a fingerprint has been detected if the sum of the gray levels is greater than the reference value.
6. The method of any one of claims 1 to 4, wherein the step of detecting an existence of a fingerprint comprises the sub-steps of:
calculating a sum of differences between gray levels with respect to the acquired image;
comparing the calculated sum of the gray levels with a pre-set reference value; and
discriminating that a fingerprint has been detected if the sum of the gray levels is less than the reference value.
7. The method of any one of claims 1 to 4, wherein the step of detecting an existence of a fingerprint comprises the sub-steps of:
calculating an average value and a dispersion value of gray levels with respect to the acquired image; and
discriminating that a fingerprint has been detected if the calculated average value is less than a first reference value and the calculated dispersion value is greater than a second reference value.
8. A method of discriminating a latent fingerprint residual on an imaging surface of an optical fingerprint input apparatus, which acquires a fingerprint image by an backlight illuminated onto a fingerprint and reflected therefrom, the method comprising the steps of:
acquiring an image by illuminating an backlight onto the imaging surface;
detecting an existence of a fingerprint from the acquired image;
acquiring an image under an off state of the backlight if a fingerprint has been detected;
detecting an existence of a fingerprint from the acquired image; and
discriminating that the fingerprint, if detected, is a latent fingerprint detected due to an external light.
9. The method of claim 8, wherein the step of acquiring an image is performed by receiving an entire screen of an image.
10. The method of claim 8. wherein the step of acquiring an image is performed by receiving only a part of an image from the tip thereof.
11. The method of claim 8, wherein the step of acquiring an image is performed by receiving only a part of an image by using a windowing function of an image sensor.
12. The method of any one of claims 8 to 11, wherein the step of detecting an existence of a fingerprint comprises the sub-steps of:
calculating a sum of differences between gray levels of adjacent pixels of the acquired image on an X axis or a Y axis of a coordinate;
comparing the calculated sum of the gray levels with a pre-set reference value; and
discriminating that a fingerprint has been detected if the sum of the gray levels is greater than the reference value.
13. The method of any one of claims 8 to 11, wherein the step of detecting an existence of a fingerprint comprises the sub-steps of:
calculating a sum of differences between gray levels with respect to the acquired image;
comparing the calculated sum of the gray levels with a pre-set reference value; and
discriminating that a fingerprint has been detected if the sum of the gray levels is less than the reference value.
14. The method of any one of claims 8 to 11, wherein the step of detecting an existence of an fingerprint comprises the sub-steps of:
calculating an average value and a dispersion value of gray levels with respect to the acquired image; and
discriminating that a fingerprint has been detected if the calculated average value is less than a first reference value and the calculated dispersion value is greater than a second reference value.
15. A method of discriminating a latent fingerprint residual on an imaging surface of an optical fingerprint input apparatus, which acquires a fingerprint image by an backlight illuminated onto a fingerprint and reflected therefrom, the method comprising the steps of:
acquiring an image while switching on and off the backlight onto the imaging surface;
detecting an existence of a fingerprint with respect to the image part acquired under an on state of the backlight;
detecting an existence of a fingerprint with respect to the image part acquired under an off state of the backlight; and
discriminating that the fingerprint, if detected from both image parts acquired under an on state and off state of the backlight, is a latent fingerprint detected due to an external light.
16. The method of claim 15, wherein the step of acquiring an image is performed by receiving an entire screen of an image.
17. The method of claim 15, wherein the step of acquiring an image is performed by receiving only a part of an image from the tip thereof.
18. The method of claim 15. wherein the step of acquiring an image is performed by receiving only a part of an image by using a windowing function of an image sensor.
19. The method of any one of claims 5 to 18, wherein the step of detecting an existence of a fingerprint comprises the sub-steps of:
calculating a sum of differences between gray levels of adjacent pixels of the acquired image on an X axis or a Y axis of a coordinate;
comparing the calculated sum of the gray levels with a pre-set reference value; and
discriminating that a fingerprint has been detected if the sum of the gray levels is greater than the reference value.
20. The method of any one of claims 15 to 18. wherein the step of detecting an existence of a fingerprint comprises the sub-steps of:
calculating a sum of differences between gray levels with respect to the acquired image;
comparing the calculated sum of the gray levels with a pre-set reference value; and
discriminating that a fingerprint has been detected if the sum of the gray levels is less than the reference value.
21. The method of any one of claims 15 to 18, wherein the step of detecting an existence of a fingerprint comprises the sub-steps of:
calculating an average value and a dispersion value of gray levels with respect to the acquired image; and
discriminating that a fingerprint has been detected if the calculated average value is less than a first reference value and the calculated dispersion value is greater than a second reference value.
22. An apparatus for discriminating a latent fingerprint residual on an imaging surface of a fingerprint input apparatus. which acquires a fingerprint image by an backlight illuminated onto a fingerprint and reflected therefrom, the apparatus comprising:
backlight control means for controlling switching on and off of the backlight;
image acquisition means for acquiring a fingerprint image without illuminating the backlight onto the imaging surface;
fingerprint detection means for detecting an existence of a fingerprint from the image acquired by the image acquisition means; and
fingerprint discriminating means for discriminating that the fingerprint, if detected by the fingerprint detection means, is a latent fingerprint detected due to an external light.
23. The apparatus of claim 22, wherein the image acquisition means receives an entire screen of an image.
24. The apparatus of claim 22, wherein the image acquisition means receives only a part of an image from the tip thereof.
25. The apparatus of claim 22, wherein the image acquisition means receives only a part of an image by using a windowing function of an image sensor.
26. The apparatus of any one of claims 22 to 25, wherein the fingerprint detection means comprises:
calculating means for adding differences between gray levels of adjacent pixels of the acquired image on an X axis or a Y axis of a coordinate;
comparing means for comparing the added value with a pre-set reference value; and
discriminating means for discriminating that a fingerprint has been detected if the added value is less than the pre-set reference value.
27. The apparatus of any one of claims 22 to 25, wherein the fingerprint detection means comprises:
calculating means for adding gray levels with respect to the acquired image;
comparing means for comparing the added value with a pre-set reference value; and
discriminating means for discriminating that a fingerprint has been detected if the added value is less than the pre-set reference value.
28. The apparatus of any one of claims 22 to 25, wherein the fingerprint detection means comprises:
calculating means for calculating an average value and a dispersion value of gray levels with respect to the acquired image; and
discriminating means for discriminating that a fingerprint has been detected if the calculated average value is less than a first reference value and the calculated dispersion value is greater than a second reference value.
29. An apparatus for discriminating a latent fingerprint residual on an imaging surface of an optical fingerprint input apparatus, which acquires a fingerprint image by an backlight illuminated onto a fingerprint and reflected therefrom, the apparatus comprising:
backlight control means for controlling switching on and off of the backlight;
image acquisition means for acquiring a fingerprint image without illuminating an backlight onto an imaging surface under a control by the backlight control means;
fingerprint detection means for detecting an existence of a fingerprint from the image acquired by the image acquisition means;
wherein, if the fingerprint detection means has detected fingerprint, the image acquisition means re-acquire the image without illuminating the backlight onto the imaging surface; and latent fingerprint discrimination means for discriminating a fingerprint, if detected by the fingerprint acquisition means from the re-acquired image, to be a latent fingerprint detected due to an external light.
30. The apparatus of claim 29, wherein the image acquisition means receives an entire screen of an image.
31. The apparatus of claim 29, wherein the image acquisition means receives only a part of an image from the tip thereof.
32. The apparatus of claim 29, wherein the image acquisition means receives only a part of an image by using a windowing function of an image sensor.
33. The apparatus of any one of claims 29 to 32, wherein the fingerprint detection means comprises:
calculating means for adding differences between gray levels of adjacent pixels of the acquired image on an X axis or a Y axis of a coordinate;
comparing means for comparing the added value with a pre-set reference value; and
discriminating means for discriminating that a fingerprint has been detected if the added value is greater than the pre-set reference value.
34. The apparatus of any one of claims 29 to 32. wherein the fingerprint detection means comprises:
calculating means for adding gray levels with respect to the acquired image;
comparing means for comparing the added value with a pre-set reference value; and
discriminating means for discriminating that a fingerprint has been detected if the added value is less than the pre-set reference value.
35. The apparatus of any one of claims 29 to 32, wherein the fingerprint detection means comprises:
calculating means for calculating an average value and a dispersion value of gray levels with respect to the acquired image; and
discriminating means for discriminating that a fingerprint has been detected if the calculated average value is less than a first reference value and the calculated dispersion value is greater than a second reference value.
36. An apparatus for discriminating a latent fingerprint residual on an imaging surface of an optical fingerprint input apparatus, which acquires a fingerprint image by an backlight illuminated onto a fingerprint and reflected therefrom, the apparatus comprising:
backlight control means for controlling switching on and off of the backlight;
image acquisition means for acquiring an image acquiring an image while switching on and off the backlight onto the imaging surface;
fingerprint detection means for detecting an existence of a fingerprint with respect to the image parts acquired under an on state of the backlight and under an off state of the backlight, respectively; and
latent fingerprint discriminating means for discriminating that the fingerprint, if detected from both image parts acquired under an on state and off state of the backlight, is a latent fingerprint detected due to an external light.
37. The apparatus of claim 36, wherein the image acquisition means receives an entire screen of an image.
38. The apparatus of claim 36, wherein the image acquisition means receives only a part of an image from the tip thereof.
39. The apparatus of claim 36, wherein the image acquisition means receives only a part of an image by using a windowing function of an image sensor.
40. The apparatus of any one of claims 36 to 39, wherein the fingerprint detection means comprises:
calculating means for adding differences between gray levels of adjacent pixels of the acquired image on an X axis or a Y axis of a coordinate;
comparing means for comparing the added value with a pre-set reference value; and
discriminating means for discriminating that a fingerprint has been detected if the added value is greater than the pre-set reference value.
41. The apparatus of any one of claims 36 to 39, wherein the fingerprint detection means comprises:
calculating means for adding gray levels with respect to the acquired image;
comparing means for comparing the added value with a pre-set reference value; and
discriminating means for discriminating that a fingerprint has been detected if the added value is less than the pre-set reference value.
42. The apparatus of any one of claims 36 to 39, wherein the fingerprint detection means comprises:
calculating means for calculating an average value and a dispersion value of gray levels with respect to the acquired image; and
discriminating means for discriminating that a fingerprint has been detected if the calculated average value is less than a first reference value and the calculated dispersion value is greater than a second reference value.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A rotational speed control system, comprising:
at least one or more motor drive chains each comprising:
rotational speed instructing means outputting a rotational speed instructing signal setting a motor rotational speed;
a first motor driver receiving said rotational speed instructing signal from said rotational speed instructing means and driving a motor corresponding to itself based on said rotational speed instructing signal; and
at least one second motor driver capable of communicating with said first motor driver in a digital value, receiving said rotational speed instructing signal from said first motor driver and driving a motor corresponding to itself based on said rotational speed instructing signal, and
central monitoring means monitoring the operations of said first and second motor drivers in units of said motor drive chains by communicating with said first motor driver of each of said motor drive chains, wherein
said motor drive chains include a plurality of motor drive chains, and
said first motor driver of each of said plurality of motor drive chains interrupts communication with said central monitoring means when an abnormal condition occurs in the motor drive chain to which it belongs.
2. The rotational speed control system according to claim 1, wherein in each of said motor drive chains,
an in-chain wiring connecting said first motor driver and said second motor driver to each other is further provided.
3. The rotational speed control system according to claim 1, wherein
said first motor driver includes:
a communicationcontrol circuit driving said motor corresponding to itself based on said rotational speed instructing signal and capable of communicating with said central monitoring means;
a connector connected to said central monitoring means; and
switches interposed between said connector and said communicationcontrol circuit, and
said switches are interrupted in said motor drive chain in which an abnormal condition occurs.
4. The rotational speed control system according to claim 3, wherein
said second motor driver includes a communicationcontrol circuit capable of communicating with said communicationcontrol circuit of said first motor driver in a digital value via in-chain wiring, and driving said motor corresponding to itself based on said rotational speed instructing signal.
5. A rotational speed control system, comprising:
at least one or more motor drive chains each comprising:
rotational speed instructing means outputting a rotational speed instructing signal setting a motor rotational speed;
a first motor driver receiving said rotational speed instructing signal from said rotational speed instructing means and driving a motor corresponding to itself based on said rotational speed instructing signal; and
at least one second motor driver capable of communicating with said first motor driver in a digital value, receiving said rotational speed instructing signal from said first motor driver and driving a motor corresponding to itself based on said rotational speed instructing signal, and
central monitoring means monitoring the operations of said first and second motor drivers in units of said motor drive chains by communicating with said first motor driver of each of said motor drive chains, wherein in said motor drive chain,
said second motor driver includes a plurality of second motor drivers, each of which is set with a unique identification code, and
said identification codes and said rotational speed instructing signal are transmitted from said first motor driver to said second motor drivers.
6. The rotational speed control system according to claim 5, wherein
said identification codes and said rotational speed instructing signal are transmitted from said second motor drivers to said first motor driver in said motor drive chain.
7. The rotational speed control system according to claim 5, wherein
a code corresponding to a failure that occurred in said second motor driver is transmitted from said second motor driver to said first motor driver.
8. A rotational speed control system, comprising:
at least one or more motor drive chains each comprising:
rotational speed instructing means outputting a rotational speed instructing signal setting a motor rotational speed;
a first motor driver receiving said rotational speed instructing signal from said rotational speed instructing means and driving a motor corresponding to itself based on said rotational speed instructing signal; and
at least one second motor driver capable of communicating with said first motor driver in a digital value, receiving said rotational speed instructing signal from said first motor driver and driving a motor corresponding to itself based on said rotational speed instructing signal, and
central monitoring means monitoring the operations of said first and second motor drivers in units of said motor drive chains by communicating with said first motor driver of each of said motor drive chains, wherein in said motor drive chain,
said second motor driver is divided into a plurality of sub-motor drive chains, and each of said sub-motor drive chains is set with a unique identification code, and
said identification codes and said rotational speed instructing signal are transmitted from said first motor driver to said sub-motor drive chains.
9. A rotational driving system, comprising:
the rotational speed control system recited in any one of claims 1, 2 and 3 to 8; and
motors in accordance with the same specifications that are provided correspondingly to respective ones of said motor drivers and the rotational speeds thereof are controlled by said motor drivers corresponding to themselves.
10. An air blow system, comprising:
the rotational driving system recited in claim 9, and
a plurality of fans in accordance with the same specifications that are provided correspondingly to respective ones of said motors and rotationally driven by said motors corresponding to themselves.
11. A clean bench (CB) comprising the air blow system recited in claim 10.
12. An outdoor unit (300) of an air conditioner comprising the air blow system recited in claim 10.