CN105069899A - Currency detection method and currency detection device - Google Patents
Currency detection method and currency detection device Download PDFInfo
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- CN105069899A CN105069899A CN201510482012.7A CN201510482012A CN105069899A CN 105069899 A CN105069899 A CN 105069899A CN 201510482012 A CN201510482012 A CN 201510482012A CN 105069899 A CN105069899 A CN 105069899A
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Abstract
The embodiment of the invention discloses a currency detection method and a currency detection device. The currency detection method comprises the steps of: selecting an image in an ultraviolet fluorescent area of paper currency to be detected, and positioning the ultraviolet fluorescent area of the image according to a preset algorithm; acquiring local minimums of the image in the ultraviolet fluorescent area after positioning, wherein the local minimums are characteristic characters of the paper currency to be detected; and determining the authenticity of the paper currency to be detected according to an interval difference value between the local minimums and an interval difference value between characteristic characters of genuine currency, and detecting characteristic positions of the ultraviolet fluorescent area by adopting local minimums of a projection graph in the vertical direction, thereby greatly increasing the robustness.
Description
Technical field
The technical field of embodiment of the present invention banknote tester, particularly relates to a kind of method and banknote tester of currency examine.
Background technology
In existing technology, the detection of the Ultraluminescence region true and false just detects according to its bright dark degree, and the gray average in Ultraluminescence region comparatively wants high in other region, detects more rough.
Another kind of mode is the gray average by calculating Ultraluminescence region, judges its true and false, and algorithm is simply rough, meticulous not, does not judge according to its corresponding feature, easily causes erroneous judgement to the bank note that some is faked.
Summary of the invention
The object of the embodiment of the present invention is the method and the banknote tester that propose a kind of currency examine, is intended to solve the problem of the accuracy how improving the Ultraluminescence identification note true and false.
For reaching this object, the embodiment of the present invention by the following technical solutions:
A method for currency examine, described method comprises:
Select the image in the Ultraluminescence region of bank note to be detected, position according to the Ultraluminescence region of the algorithm pre-set to described image;
Obtain the local minimum of the image in the described Ultraluminescence region behind location, described local minimum is the characteristic character of described bank note to be detected;
According to the interval difference between the interval difference between described local minimum and the characteristic character of genuine note, determine the true and false of described bank note to be detected.
Preferably, the Ultraluminescence region of the algorithm that described basis pre-sets to described image positions, and comprising:
If meet if ((Hpixel [i+1]-Hpixel [i] >h_th) & & (Hpixel [i+2]-Hpixel [i] >h_th)), then determine that i is the left-hand line border in described Ultraluminescence region;
Wherein, Hpixel [i] represent the i-th row row and, Hpixel [i+1] represent the i-th+1 row arrange and, Hpixel [i+2] represent the i-th+2 row arranged with, h_th represents the threshold value determining left-hand line border.
Preferably, described according to the interval difference between the interval difference between described local minimum and the characteristic character of genuine note, determine the true and false of described bank note to be detected, comprising:
If the interval difference between the interval difference of described local minimum and the characteristic character of genuine note is identical, then determine that described bank note to be detected is true;
If the interval difference between the interval difference of described local minimum and the characteristic character of genuine note is different, then determine that described bank note to be detected is false.
Preferably, described method also comprises:
Determine the region that the metal wire of described bank note to be detected blocks;
The local minimum of described bank note to be detected is determined in the region of blocking according to the metal wire of described bank note to be detected.
Preferably, describedly determine the region that the metal wire of described bank note to be detected blocks, to comprise:
If max_val-mean_l>th or max_val-mean_r>th, then determine that the region selected is the region that metal wire blocks;
Wherein, max_val represents selection area, mean_l representation feature point range left side apportion and average, mean_r representation feature point range right-hand column and average, th represents threshold value.
A kind of banknote tester, described banknote tester comprises:
Locating module, for selecting the image in the Ultraluminescence region of bank note to be detected, positions according to the Ultraluminescence region of the algorithm pre-set to described image;
Acquisition module, for obtaining the local minimum of the image in the described Ultraluminescence region behind location, described local minimum is the characteristic character of described bank note to be detected;
First determination module, for according to the interval difference between the interval difference between described local minimum and the characteristic character of genuine note, determines the true and false of described bank note to be detected.
Preferably, described locating module is used for:
If meet if ((Hpixel [i+1]-Hpixel [i] >h_th) & & (Hpixel [i+2]-Hpixel [i] >h_th)), then determine that i is the left-hand line border in described Ultraluminescence region;
Wherein, Hpixel [i] represent the i-th row row and, Hpixel [i+1] represent the i-th+1 row arrange and, Hpixel [i+2] represent the i-th+2 row arranged with, h_th represents the threshold value determining left-hand line border.
Preferably, described determination module, comprising:
First determining unit, if identical for the interval difference between the interval difference of described local minimum and the characteristic character of genuine note, then determines that described bank note to be detected is true;
Second determining unit, if different for the interval difference between the interval difference of described local minimum and the characteristic character of genuine note, then determines that described bank note to be detected is false.
Preferably, described device also comprises:
Second determination module, for determining the region that the metal wire of described bank note to be detected blocks;
3rd determination module, the local minimum of described bank note to be detected is determined in the region for blocking according to the metal wire of described bank note to be detected.
Preferably, described second determination module, for:
If max_val-mean_l>th or max_val-mean_r>th, then determine that the region selected is the region that metal wire blocks;
Wherein, max_val represents selection area, mean_l representation feature point range left side apportion and average, mean_r representation feature point range right-hand column and average, th represents threshold value.
The embodiment of the present invention, by selecting the image in the Ultraluminescence region of bank note to be detected, positions according to the Ultraluminescence region of the algorithm pre-set to described image; Obtain the local minimum of the image in the described Ultraluminescence region behind location, described local minimum is the characteristic character of described bank note to be detected; According to the interval difference between the interval difference between described local minimum and the characteristic character of genuine note, determine the true and false of described bank note to be detected, thus adopting the local minimum of vertical direction perspective view to detect Ultraluminescence provincial characteristics position, robustness is greatly enhanced.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of method first embodiment of embodiment of the present invention currency examine;
Fig. 2 is the schematic diagram of the Ultraluminescence area image of a kind of 100 yuan notes that the embodiment of the present invention provides;
Fig. 3 is the schematic flow sheet of method second embodiment of embodiment of the present invention currency examine;
Fig. 4 is the schematic diagram that a kind of metal wire that the embodiment of the present invention provides blocks;
Fig. 5 is the high-level schematic functional block diagram of embodiment of the present invention banknote tester;
Fig. 6 is the high-level schematic functional block diagram of the embodiment of the present invention first determination module 503;
Fig. 7 is the high-level schematic functional block diagram of embodiment of the present invention banknote tester.
Embodiment
Below in conjunction with drawings and Examples, the embodiment of the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the embodiment of the present invention, but not the restriction to the embodiment of the present invention.It also should be noted that, for convenience of description, illustrate only the part relevant to the embodiment of the present invention in accompanying drawing but not entire infrastructure.
Embodiment one
It is the schematic flow sheet of method first embodiment of embodiment of the present invention currency examine with reference to figure 1, Fig. 1.
In embodiment one, the method for described currency examine comprises:
Step 101, selects the image in the Ultraluminescence region of bank note to be detected, positions according to the Ultraluminescence region of the algorithm pre-set to described image;
Preferably, the Ultraluminescence region of the algorithm that described basis pre-sets to described image positions, and comprising:
If meet if ((Hpixel [i+1]-Hpixel [i] >h_th) & & (Hpixel [i+2]-Hpixel [i] >h_th)), then determine that i is the left-hand line border in described Ultraluminescence region;
Wherein, Hpixel [i] represent the i-th row row and, Hpixel [i+1] represent the i-th+1 row arrange and, Hpixel [i+2] represent the i-th+2 row arranged with, h_th represents the threshold value determining left-hand line border.
Step 102, obtain the local minimum of the image in the described Ultraluminescence region behind location, described local minimum is the characteristic character of described bank note to be detected;
Step 103, according to the interval difference between the interval difference between described local minimum and the characteristic character of genuine note, determines the true and false of described bank note to be detected.
Preferably, described according to the interval difference between the interval difference between described local minimum and the characteristic character of genuine note, determine the true and false of described bank note to be detected, comprising:
If the interval difference between the interval difference of described local minimum and the characteristic character of genuine note is identical, then determine that described bank note to be detected is true;
If the interval difference between the interval difference of described local minimum and the characteristic character of genuine note is different, then determine that described bank note to be detected is false.
Concrete, be the schematic diagram of the Ultraluminescence area image of a kind of 100 yuan notes that the embodiment of the present invention provides with reference to figure 2, Fig. 2.
First (left character of " 18 " character is " 8 ", the minimal value of the right figure high order end of corresponding diagram 2, and this feature is comparatively obvious, can position according to this feature of minimal value to it to orient the position of " 9 " in the left figure of Fig. 2.
According to " 9 " position, orient further feature point, 5 positions at fluorescence area as shown in Figure 2, then carry out feature detection.If have more than 2 or 2 not meet decision condition in 5 unique points, then think that fluorescence area is differentiated unsuccessfully.Here the major way of feature detection is that minimum point detects.
The embodiment of the present invention, by selecting the image in the Ultraluminescence region of bank note to be detected, positions according to the Ultraluminescence region of the algorithm pre-set to described image; Obtain the local minimum of the image in the described Ultraluminescence region behind location, described local minimum is the characteristic character of described bank note to be detected; According to the interval difference between the interval difference between described local minimum and the characteristic character of genuine note, determine the true and false of described bank note to be detected, thus adopting the local minimum of vertical direction perspective view to detect Ultraluminescence provincial characteristics position, robustness is greatly enhanced.
Embodiment two
It is the schematic flow sheet of method second embodiment of embodiment of the present invention currency examine with reference to figure 3, Fig. 3.
On the basis of embodiment one, the method for described currency examine also comprises:
Step 104, determines the region that the metal wire of described bank note to be detected blocks;
Preferably, describedly determine the region that the metal wire of described bank note to be detected blocks, to comprise:
If max_val-mean_l>th or max_val-mean_r>th, then determine that the region selected is the region that metal wire blocks;
Wherein, max_val represents selection area, mean_l representation feature point range left side apportion and average, mean_r representation feature point range right-hand column and average, th represents threshold value.
Step 105, the local minimum of described bank note to be detected is determined in the region of blocking according to the metal wire of described bank note to be detected.
Concrete, be the schematic diagram that a kind of metal wire that the embodiment of the present invention provides blocks with reference to figure 4, Fig. 4.For the region that metal wire blocks, its gray-scale value is low compared with other place, if max_val-mean_l>th or max_val-mean_r>th, then think exist magnetic stripe cover situation, though the non-minimal value of unique point is also judged to be to be true herein.Max_val represent selection area (can choose unique point row left and right each 10 row) row and maximal value, the average of mean_l representation feature point range left side apportion and (desirable left side 10 arranges), mean_r representation feature point range right-hand column and average, th represents threshold value (herein desirable 1200).
The embodiment of the present invention, by selecting the image in the Ultraluminescence region of bank note to be detected, positions according to the Ultraluminescence region of the algorithm pre-set to described image; Obtain the local minimum of the image in the described Ultraluminescence region behind location, described local minimum is the characteristic character of described bank note to be detected; According to the interval difference between the interval difference between described local minimum and the characteristic character of genuine note, determine the true and false of described bank note to be detected, thus adopting the local minimum of vertical direction perspective view to detect Ultraluminescence provincial characteristics position, robustness is greatly enhanced; Meanwhile, when introducing metal wire blocks feature detection place, the feature detection low according to metal wire gray-scale value goes out the situation that metal wire blocks, and improves the precision of algorithm.
Embodiment three
With reference to the high-level schematic functional block diagram that figure 5, Fig. 5 is embodiment of the present invention banknote tester.
In embodiment three, described banknote tester comprises:
Locating module 501, for selecting the image in the Ultraluminescence region of bank note to be detected, positions according to the Ultraluminescence region of the algorithm pre-set to described image;
Preferably, described locating module 501 for:
If meet if ((Hpixel [i+1]-Hpixel [i] >h_th) & & (Hpixel [i+2]-Hpixel [i] >h_th)), then determine that i is the left-hand line border in described Ultraluminescence region;
Wherein, Hpixel [i] represent the i-th row row and, Hpixel [i+1] represent the i-th+1 row arrange and, Hpixel [i+2] represent the i-th+2 row arranged with, h_th represents the threshold value determining left-hand line border.
Acquisition module 502, for obtaining the local minimum of the image in the described Ultraluminescence region behind location, described local minimum is the characteristic character of described bank note to be detected;
First determination module 503, for according to the interval difference between the interval difference between described local minimum and the characteristic character of genuine note, determines the true and false of described bank note to be detected.
Preferably, with reference to figure 6, Fig. 6 be the high-level schematic functional block diagram of the embodiment of the present invention first determination module 503.
Described first determination module 503, comprising:
First determining unit 601, if identical for the interval difference between the interval difference of described local minimum and the characteristic character of genuine note, then determines that described bank note to be detected is true;
Second determining unit 602, if different for the interval difference between the interval difference of described local minimum and the characteristic character of genuine note, then determines that described bank note to be detected is false.
Concrete, be the schematic diagram of the Ultraluminescence area image of a kind of 100 yuan notes that the embodiment of the present invention provides with reference to figure 2, Fig. 2.
First (left character of " 18 " character is " 8 ", the minimal value of the right figure high order end of corresponding diagram 2, and this feature is comparatively obvious, can position according to this feature of minimal value to it to orient the position of " 9 " in the left figure of Fig. 2.
According to " 9 " position, orient further feature point, 5 positions at fluorescence area as shown in Figure 2, then carry out feature detection.If have more than 2 or 2 not meet decision condition in 5 unique points, then think that fluorescence area is differentiated unsuccessfully.Here the major way of feature detection is that minimum point detects.
The embodiment of the present invention, by selecting the image in the Ultraluminescence region of bank note to be detected, positions according to the Ultraluminescence region of the algorithm pre-set to described image; Obtain the local minimum of the image in the described Ultraluminescence region behind location, described local minimum is the characteristic character of described bank note to be detected; According to the interval difference between the interval difference between described local minimum and the characteristic character of genuine note, determine the true and false of described bank note to be detected, thus adopting the local minimum of vertical direction perspective view to detect Ultraluminescence provincial characteristics position, robustness is greatly enhanced.
Embodiment four
With reference to the high-level schematic functional block diagram that figure 7, Fig. 7 is embodiment of the present invention banknote tester.
On the basis of embodiment three, described banknote tester also comprises:
Second determination module 504, for determining the region that the metal wire of described bank note to be detected blocks;
Preferably, described second determination module 504, for:
If max_val-mean_l>th or max_val-mean_r>th, then determine that the region selected is the region that metal wire blocks;
Wherein, max_val represents selection area, mean_l representation feature point range left side apportion and average, mean_r representation feature point range right-hand column and average, th represents threshold value.
3rd determination module 505, the local minimum of described bank note to be detected is determined in the region for blocking according to the metal wire of described bank note to be detected.
Concrete, be the schematic diagram that a kind of metal wire that the embodiment of the present invention provides blocks with reference to figure 4, Fig. 4.For the region that metal wire blocks, its gray-scale value is low compared with other place, if max_val-mean_l>th or max_val-mean_r>th, then think exist magnetic stripe cover situation, though the non-minimal value of unique point is also judged to be to be true herein.Max_val represent selection area (can choose unique point row left and right each 10 row) row and maximal value, the average of mean_l representation feature point range left side apportion and (desirable left side 10 arranges), mean_r representation feature point range right-hand column and average, th represents threshold value (herein desirable 1200).
The embodiment of the present invention, by selecting the image in the Ultraluminescence region of bank note to be detected, positions according to the Ultraluminescence region of the algorithm pre-set to described image; Obtain the local minimum of the image in the described Ultraluminescence region behind location, described local minimum is the characteristic character of described bank note to be detected; According to the interval difference between the interval difference between described local minimum and the characteristic character of genuine note, determine the true and false of described bank note to be detected, thus adopting the local minimum of vertical direction perspective view to detect Ultraluminescence provincial characteristics position, robustness is greatly enhanced; Meanwhile, when introducing metal wire blocks feature detection place, the feature detection low according to metal wire gray-scale value goes out the situation that metal wire blocks, and improves the precision of algorithm.
Below the know-why of the embodiment of the present invention is described in conjunction with specific embodiments.These describe the principle just in order to explain the embodiment of the present invention, and can not be interpreted as the restriction to embodiment of the present invention protection domain by any way.Based on explanation herein, those skilled in the art does not need to pay other embodiment that performing creative labour can associate the embodiment of the present invention, these modes all by fall into the embodiment of the present invention protection domain within.
Claims (10)
1. a method for currency examine, is characterized in that, described method comprises:
Select the image in the Ultraluminescence region of bank note to be detected, position according to the Ultraluminescence region of the algorithm pre-set to described image;
Obtain the local minimum of the image in the described Ultraluminescence region behind location, described local minimum is the characteristic character of described bank note to be detected;
According to the interval difference between the interval difference between described local minimum and the characteristic character of genuine note, determine the true and false of described bank note to be detected.
2. method according to claim 1, is characterized in that, the Ultraluminescence region of the algorithm that described basis pre-sets to described image positions, and comprising:
If meet if ((Hpixel [i+1]-Hpixel [i] >h_th) & & (Hpixel [i+2]-Hpixel [i] >h_th)), then determine that i is the left-hand line border in described Ultraluminescence region;
Wherein, Hpixel [i] represent the i-th row row and, Hpixel [i+1] represent the i-th+1 row arrange and, Hpixel [i+2] represent the i-th+2 row arranged with, h_th represents the threshold value determining left-hand line border.
3. method according to claim 1, is characterized in that, described according to the interval difference between the interval difference between described local minimum and the characteristic character of genuine note, determines the true and false of described bank note to be detected, comprising:
If the interval difference between the interval difference of described local minimum and the characteristic character of genuine note is identical, then determine that described bank note to be detected is true;
If the interval difference between the interval difference of described local minimum and the characteristic character of genuine note is different, then determine that described bank note to be detected is false.
4. the method according to claims 1 to 3 any one, is characterized in that, described method also comprises:
Determine the region that the metal wire of described bank note to be detected blocks;
The local minimum of described bank note to be detected is determined in the region of blocking according to the metal wire of described bank note to be detected.
5. method according to claim 4, is characterized in that, describedly determines the region that the metal wire of described bank note to be detected blocks, to comprise:
If max_val-mean_l>th or max_val-mean_r>th, then determine that the region selected is the region that metal wire blocks;
Wherein, max_val represents selection area, mean_l representation feature point range left side apportion and average, mean_r representation feature point range right-hand column and average, th represents threshold value.
6. a banknote tester, is characterized in that, described banknote tester comprises:
Locating module, for selecting the image in the Ultraluminescence region of bank note to be detected, positions according to the Ultraluminescence region of the algorithm pre-set to described image;
Acquisition module, for obtaining the local minimum of the image in the described Ultraluminescence region behind location, described local minimum is the characteristic character of described bank note to be detected;
First determination module, for according to the interval difference between the interval difference between described local minimum and the characteristic character of genuine note, determines the true and false of described bank note to be detected.
7. device according to claim 6, is characterized in that, described locating module is used for:
If meet if ((Hpixel [i+1]-Hpixel [i] >h_th) & & (Hpixel [i+2]-Hpixel [i] >h_th)), then determine that i is the left-hand line border in described Ultraluminescence region;
Wherein, Hpixel [i] represent the i-th row row and, Hpixel [i+1] represent the i-th+1 row arrange and, Hpixel [i+2] represent the i-th+2 row arranged with, h_th represents the threshold value determining left-hand line border.
8. device according to claim 6, is characterized in that, described first determination module, comprising:
First determining unit, if identical for the interval difference between the interval difference of described local minimum and the characteristic character of genuine note, then determines that described bank note to be detected is true;
Second determining unit, if different for the interval difference between the interval difference of described local minimum and the characteristic character of genuine note, then determines that described bank note to be detected is false.
9. the device according to claim 6 to 8 any one, is characterized in that, described device also comprises:
Second determination module, for determining the region that the metal wire of described bank note to be detected blocks;
3rd determination module, the local minimum of described bank note to be detected is determined in the region for blocking according to the metal wire of described bank note to be detected.
10. device according to claim 9, is characterized in that, described second determination module, for:
If max_val-mean_l>th or max_val-mean_r>th, then determine that the region selected is the region that metal wire blocks;
Wherein, max_val represents selection area, mean_l representation feature point range left side apportion and average, mean_r representation feature point range right-hand column and average, th represents threshold value.
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| CN201510482012.7A CN105069899B (en) | 2015-08-03 | 2015-08-03 | The method and banknote tester of a kind of currency examination |
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