TWI628602B - Noise suppression method of fingerprint collecting device - Google Patents

Abstract

A noise suppression method for a fingerprint collection device, comprising: (A) a processing unit controlling an S×T conversion unit to convert an M×N sensing unit, and each sensing signal generated by the S×T sensing unit is composed of S×T a digital signal, wherein each of the sensing signal groups includes an S×T sensing signal, and while the sensing signal group is converted, the processing unit controls the detection conversion unit to convert a sensing unit generated by the M×N sensing unit. The sensing signal is for detecting a digital signal; (B) the processing unit selects one of the digital signal groups converted by the S×T conversion unit as a reference digital signal group; and (C) the processing unit according to at least the digital signal and the detection digital position The signal obtains the first correction value and the second correction value, and corrects the digital signal group except the reference digital signal group according to the first correction value and the second correction value.

Description

Noise suppression method of fingerprint collecting device

The invention relates to a noise suppression method, in particular to a noise suppression method of a fingerprint collection device.

Existing fingerprint collection devices, such as capacitive fingerprint collection devices, include multiple sensing electrodes. The sensing electrodes sense the change in capacitance generated by the finger and convert it into the change in electrical signal. The existing fingerprint collection device is generally powered by a lithium battery, so the device will have a charging circuit, and the charging circuit has common-mode interference (common-mode noise) will generate common-mode noise (common-mode noise), common mode Noise will affect the sensing electrodes of the fingerprint collecting device, resulting in inaccurate values sensed by the sensing electrodes or causing false sensing signals, which makes the fingerprint image generated by the fingerprint collecting device blurred, thereby affecting the recognition effect .

In order to suppress, a plurality of analog-to-digital converters (ADC) will be added to the circuit of the fingerprint collection device to convert the electrical signals generated by the sensing electrodes into gray-scale values at the same time For digital signals, if the number of ADCs included in the circuit of the fingerprint collection device and the sensing electrodes are equal, there is no common mode interference.

However, too much ADC makes the hardware cost increase significantly, so the existing fingerprint collection device uses a small amount of ADC to reduce the cost to convert the sensing electrodes at different times by Time-Division Multiplexing (TDM). For example, three ADCs convert the electrical signals generated by the nine sensing electrodes with three ADCs at three different times, so that common-mode noise can exist in the final digital signal.

Therefore, how to reduce the common mode noise of the fingerprint collection device has become an urgent problem to be solved.

Therefore, the object of the present invention is to provide a noise suppression method for a fingerprint collection device that can reduce the common mode noise of the fingerprint collection device.

Therefore, the noise suppression method of the fingerprint collection device of the present invention is implemented by a fingerprint collection device, which includes an M × N array sensing unit, an S × T array conversion unit, a detection conversion unit and a A processing unit, the sensing unit is connected to the S × T conversion units and the detection conversion unit, and the processing unit is electrically connected to the S × T conversion units and the detection conversion unit, each sensing unit is used To generate a sensing signal, where M is a multiple of S, N is a multiple of T, and M × N> S × T, the sensing units of the M × N array can be divided into (M / S) × (N / T) array of sensing unit groups, each sensing unit group includes S × T sensing units, and the noise suppression method of the fingerprint collection device includes the following steps:

(A) The processing unit controls the S × T conversion units to sequentially convert the S × T sensing units in each of the N / T sensing unit groups in one of the M / S rows The generated sensing signal group including the S × T pen sensing signal is a digital signal group including the S × T pen digital signal, and the processing unit controls the S × T conversion units to convert the first to (N / T) -1 while the sensing signal group of the sensing unit group of one line, the processing unit also controls the detection conversion unit to convert the current conversion sensing unit adjacent to the S × T conversion units being converted A group, and a sensing signal generated by a sensing unit in a sensing unit group in a row below the current conversion sensing unit group is a detection digital signal;

(B) Select the converted digital signal group corresponding to the sensor unit group in the Kth row of the sensor unit group in the N / T row in the column as a reference digital signal group, K 1 ~ (N / T); and

(C) For each of the converted digital signal groups corresponding to the sensing unit group in the i-th row in the column, i = 1 ~ K-1, the processing unit is based on at least the S × T When the conversion unit converts the sensing signal group of the sensing unit group in the i-th row in the column, the target detection digital signal converted by the detection conversion unit and the S × T conversion units convert The digital signal corresponding to the target detection digital signal in the digital signal group of the sensing unit group corresponding to the i + 1th row in the column to obtain the converted corresponding to the ith row in the column A first correction value of the digital signal group of the sensing unit group of, and corrects the converted value according to the first correction value of the digital signal group of the sensing unit group corresponding to the i-th row in the column Each digital signal in the digital signal group of the sensing unit group corresponding to the i-th row in the column, and for the converted digital signal corresponding to the sensing unit group of the j-th row in the column For each of the groups, j = K + 1 ~ (N / T), the processing unit converts at least j-1 of the row according to the S × T conversion units The sensing signal group of the sensing unit group of the row, the target detection digital signal converted by the detection conversion unit and the S × T conversion units corresponding to the jth row in the column In the digital signal group of the sensing unit group of the corresponding digital signal corresponding to the target detection digital signal, obtain the digital signal group corresponding to the converted digital signal group corresponding to the sensing unit group of the jth row in the column A second correction value, and according to the second correction value of the digital signal group of the sensing unit group corresponding to the jth row in the column, correct the converted sense corresponding to the jth row in the column Each digital signal in the digital signal group of the test unit group.

Therefore, another object of the present invention is to provide a noise suppression method for a fingerprint collection device that can reduce common mode noise of the fingerprint collection device.

Therefore, the noise suppression method of the fingerprint collection device of the present invention is implemented by a fingerprint collection device, which includes an M × N array sensing unit, an S × T array conversion unit, a detection conversion unit and a A processing unit, the sensing unit is connected to the S × T conversion units and the detection conversion unit, and the processing unit is electrically connected to the S × T conversion units and the detection conversion unit, each sensing unit is used To generate a sensing signal, where M is a multiple of S, N is a multiple of T, and M × N> S × T, the sensing units of the M × N array can be divided into (M / S) × (N / T) array of sensing unit groups, each sensing unit group includes S × T sensing units, and the noise suppression method of the fingerprint collection device includes the following steps:

(A) The processing unit controls the S × T conversion units to sequentially convert the S × T sensing units in each of the N / T sensing unit groups in one of the M / S rows The generated sensing signal group including the S × T pen sensing signal is a digital signal group including the S × T pen digital signal, and the processing unit controls the S × T conversion units to convert the first to (N / T) -1 while the sensing signal group of the sensing unit group of one line, the processing unit also controls the detection conversion unit to convert the current conversion sensing unit adjacent to the S × T conversion units being converted A group, and a sensing signal generated by a sensing unit in a sensing unit group in a row above the current conversion sensing unit group is a detection digital signal;

(B) Select the converted digital signal group corresponding to the sensor unit group in the Kth row of the sensor unit group in the N / T row in the column as a reference digital signal group, K 1 ~ (N / T); and

(C) For each of the converted digital signal groups corresponding to the sensing unit group in the i-th row in the column, i = 1 ~ K-1, the processing unit is based on at least the S × T When the conversion unit converts the sensing signal group of the sensing unit group in the i + 1th row in the column, the target detection digital signal converted by the detection conversion unit, and the S × T conversion units The converted digital signal corresponding to the target detection digital signal in the digital signal group corresponding to the sensing unit group in the i-th row in the column to obtain the converted i-th corresponding to the i-th in the column A first correction value of the digital signal group of the sensing unit group of the row, and correcting the converted according to the first correction value of the digital signal group corresponding to the sensing unit group of the i-th row in the column Of each digital signal in the digital signal group of the sensing unit group corresponding to the i-th row in the column, and for the converted digital number corresponding to the sensing unit group of the j-th row in the column For each of the signal groups, j = K + 1 ~ (N / T), the processing unit converts the jth in the row at least according to the S × T conversion units The sensing signal group of the sensing unit group of the target detection digital signal converted by the detection conversion unit, and the conversion of the S × T conversion units corresponding to the j-1 in the row In the digital signal group of the sensing unit group of the row, the digital signal corresponding to the target detected digital signal is obtained, and the digital signal group corresponding to the converted sensing unit group corresponding to the jth row in the column is obtained A second correction value, and according to the second correction value of the digital signal group of the sensing unit group corresponding to the jth row in the column, correct the converted value corresponding to the jth row in the column Each digital signal in the digital signal group of the sensing unit group.

Therefore, another object of the present invention is to provide a noise suppression method for a fingerprint collection device that can reduce common mode noise of the fingerprint collection device.

Therefore, the noise suppression method of the fingerprint collection device of the present invention is implemented by a fingerprint collection device, which includes an M × N array sensing unit, an S × T array conversion unit, a detection conversion unit and a A processing unit, the sensing unit is connected to the S × T conversion units and the detection conversion unit, and the processing unit is electrically connected to the S × T conversion units and the detection conversion unit, each sensing unit is used To generate a sensing signal, where M is a multiple of S, N is a multiple of T, and M × N> S × T, the sensing units of the M × N array can be divided into (M / S) × (N / T) array of sensing unit groups, each sensing unit group includes S × T sensing units, and the noise suppression method of the fingerprint collection device includes the following steps:

(A) The processing unit controls the S × T conversion units to sequentially convert the S × T sensing units in each of the M / S sensing unit groups in one row of the N / T rows The generated sensing signal group including the S × T pen sensing signal is a digital signal group including the S × T pen digital signal, and the processing unit controls the S × T conversion units to convert the first to (M / S)-the sensing signal group of the sensing unit group of the 1st row, the processing unit also controls the detection conversion unit to convert the current conversion sensing unit adjacent to the S × T conversion units being converted A group, and a sensing signal generated by a sensing unit in a sensing unit group in a row under the current conversion sensing unit group is a detection digital signal;

(B) Select the converted digital signal group corresponding to the sensing unit group in the Kth column of the sensing unit group in the M / S column in the row as a reference digital signal group, K 1 ~ (M / S); and

(C) For each of the converted digital signal groups corresponding to the sensing unit group in the i-th column of the row, i = 1 ~ K-1, the processing unit at least according to the S × T When the conversion unit converts the sensing signal group of the sensing unit group in the i-th column in the row, the target detection digital signal converted by the detection conversion unit and the S × T conversion units are converted The digital signal group corresponding to the target detection digital signal in the digital signal group corresponding to the sensing unit group of the i + 1th column in the row is obtained, corresponding to the converted i-th corresponding to the i-th row in the row A first correction value of the digital signal group of the sensing unit group of the column, and correcting the converted according to the first correction value of the digital signal group corresponding to the sensing unit group of the i-th column in the row Of each digital signal in the digital signal group of the sensing unit group corresponding to the i-th column in the row, and for the converted digital number corresponding to the sensing unit group of the j-th column in the row For each of the signal groups, j = K + 1 ~ (M / S), the processing unit converts the jth in the row at least according to the S × T conversion units In the sensing signal group of the sensing unit group of one column, the target detection digital signal converted by the detection conversion unit, and the conversion of the S × T conversion units corresponding to the jth in the row In the digital signal group of the sensing unit group of the row, the digital signal corresponding to the target detection digital signal is obtained, and the digital signal group corresponding to the converted sensing unit group corresponding to the jth column in the row is obtained A second correction value, and according to the second correction value of the digital signal group of the sensing unit group corresponding to the jth column in the row, correct the converted value corresponding to the jth column in the row Each digital signal in the digital signal group of the sensing unit group.

Therefore, another object of the present invention is to provide a noise suppression method for a fingerprint collection device that can reduce common mode noise of the fingerprint collection device.

Therefore, the noise suppression method of the fingerprint collection device of the present invention is implemented by a fingerprint collection device, which includes an M × N array sensing unit, an S × T array conversion unit, a detection conversion unit and a A processing unit, the sensing unit is connected to the S × T conversion units and the detection conversion unit, and the processing unit is electrically connected to the S × T conversion units and the detection conversion unit, each sensing unit is used To generate a sensing signal, where M is a multiple of S, N is a multiple of T, and M × N> S × T, the sensing units of the M × N array can be divided into (M / S) × (N / T) array of sensing unit groups, each sensing unit group includes S × T sensing units, and the noise suppression method of the fingerprint collection device includes the following steps:

(A) The processing unit controls the S × T conversion units to sequentially convert the S × T sensing units in each of the M / S sensing unit groups in one row of the N / T rows The generated sensing signal group including the S × T pen sensing signal is a digital signal group including the S × T pen digital signal, and the processing unit controls the S × T conversion units to convert the first to (M / S)-the sensing signal group of the sensing unit group of the 1st row, the processing unit also controls the detection conversion unit to convert the current conversion sensing unit adjacent to the S × T conversion units being converted A group, and a sensing signal generated by a sensing unit in the sensing unit group in a row above the current conversion sensing unit group is a detection digital signal;

(B) Select the converted digital signal group corresponding to the sensing unit group in the Kth column of the sensing unit group in the M / S column in the row as a reference digital signal group, K 1 ~ (M / S); and

(C) For each of the converted digital signal groups corresponding to the sensing unit group in the i-th column of the row, i = 1 ~ K-1, the processing unit at least according to the S × T When the conversion unit converts the sensing signal group of the sensing unit group in the i + 1th column in the row, the target detection digital signal converted by the detection conversion unit, and the S × T conversion units The converted digital signal corresponding to the target detection digital signal in the digital signal group of the sensing unit group corresponding to the i-th column in the row to obtain the converted i-th corresponding to the i-th in the row A first correction value of the digital signal group of the sensing unit group of the column, and correcting the converted according to the first correction value of the digital signal group corresponding to the sensing unit group of the i-th column in the row Of each digital signal in the digital signal group of the sensing unit group corresponding to the i-th column in the row, and for the converted digital number corresponding to the sensing unit group of the j-th column in the row For each of the signal groups, j = K + 1 ~ (M / S), the processing unit converts the jth column in the row at least according to the S × T conversion units When sensing the signal group of the sensing unit group, the target detection digital signal converted by the detection conversion unit, and the S × T conversion units converted corresponding to the j-1th column in the row In the digital signal group of the sensing unit group of the corresponding digital signal of the target detection digital signal to obtain the digital signal group corresponding to the converted digital signal group corresponding to the sensing unit group of the jth column in the row A second correction value, and according to the second correction value of the digital signal group of the sensing unit group corresponding to the jth column in the row, correct the converted sense corresponding to the jth column in the row Each digital signal in the digital signal group of the test unit group.

The effect of the present invention is that the processing unit controls the S × T conversion units and the detection conversion unit to convert the sensing signals generated by the same sensing unit at different times to obtain the first correction value and the The second correction value is used to correct the digital signal group except the reference digital signal group with the first correction value and the second correction value to reduce common mode noise of the fingerprint collection device.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same number.

Referring to FIG. 1, a fingerprint collection device 1 for implementing the noise suppression method of the fingerprint collection device of the present invention is described. The fingerprint collection device 1 includes an M × N array sensing unit 111, an S × T array conversion unit 12, A detection conversion unit 13 and a processing unit 14, the sensing unit 111 is connected to the S × T conversion units 12 and the detection conversion unit 13, and the processing unit 14 is electrically connected to the S × T conversion units 12 and the detection and conversion unit 13, wherein M is a multiple of S, N is a multiple of T, and M × N> S × T, the sensing units 111 of the M × N array can be divided into (M / S) × (N / T) array of sensing unit groups 11, each sensing unit group 11 includes S × T sensing units 111 (as shown in FIG. 2).

The M × N sensing units 111 are, for example, detection electrodes, and each sensing unit 111 is used to generate a sensing signal.

The conversion units 12 of the S × T array and the detection conversion unit 13 are, for example, analog-to-digital converters (Analog-to-Digital Converter, ADC), and each conversion unit 12 is used to convert a sensing signal into a digital Signal, the detection and conversion unit 13 is used to convert a sensing signal into a detection digital signal.

A first embodiment of the noise suppression method of the fingerprint collection device of the present invention includes a digital signal generation procedure and a calibration procedure.

Referring to FIG. 1 and FIG. 3, the following describes the steps of the digital signal generating program of the first embodiment implemented by the fingerprint collecting device 1.

In step 201, the processing unit 14 controls the S × T conversion units 12 to convert the sensing signal group generated by the sensing unit group 11 of the first column, that is, m is set to 1.

In step 202, the processing unit 14 controls the S × T conversion units 12 to convert the sensing signal group generated by the sensing unit group 11 of the first row, that is, n is set to 1.

In step 203, the S × T sensing units 111 in the mth column and nth row sensing unit group 11 generate a sensing signal group including an S × T pen sensing signal.

In step 204, the processing unit 14 controls the S × T conversion units 12 to convert the sensing signal group into a digital signal group including S × T digital signals, and controls the S × T in the processing unit 14 At the same time, the conversion unit 12 converts the sensing signal group of the sensing unit group 11 in the mth column and nth row, the processing unit 14 also controls the detection conversion unit 13 to switch under the current conversion sensing unit group 11 The sensing signal generated by the sensing unit 111 in the sensing unit group 11 of one row is a detection digital signal.

In step 205, the processing unit 14 determines whether the sensing unit group 11 of the nth row is the sensing unit group 11 of the N / T row, that is, whether n = N / T. When the processing unit 14 determines that the sensing unit group 11 of the nth row is not the sensing unit group 11 of the N / T row, the flow proceeds to step 206. When the processing unit 14 determines that the sensing unit group 11 of the nth row is the sensing unit group 11 of the N / T row, the flow proceeds to step 207.

In step 206, for the sensing unit group 11 of the n + 1th row, n is set to n + 1. Thereafter, steps 203 to 205 are repeated until n = N / T.

In step 207, the processing unit 14 determines whether the sensing unit group 11 in the mth column is the sensing unit group 11 in the M / Sth column, that is, whether m = M / S. When the processing unit 14 determines that the sensing unit group 11 of the mth column is not the sensing unit group 11 of the M / Sth column, the flow proceeds to step 208. When the processing unit 14 determines that the sensing unit group 11 in the mth column is the sensing unit group 11 in the M / Sth column, the flow ends.

In step 208, for the sensing unit group 11 in the m + 1th row, that is, m is set to m + 1. Thereafter, steps 203 to 207 are repeated until m = M / S.

It should be noted that the first embodiment sets m = 1 and n = 1 to sequentially convert the sensing signal, but in other embodiments, m, n can randomly convert the sensing signal.

Referring to FIG. 1 and FIG. 4, the following describes the steps of the fingerprint acquisition device 1 implementing the calibration procedure of the first embodiment.

In step 301, the processing unit 14 corrects the digital signal group generated by the sensing unit group 11 in the first column, that is, sets m to 1.

In step 302, the processing unit 14 selects the digital signal group corresponding to the sensing unit group 11 of the Kth row in the mth column converted by the S × T conversion units 12 as a reference digital signal Group, where K 1 ~ (N / T).

In step 303, the processing unit 14 detects the conversion unit when converting the sensing signal group of the sensing unit group 11 of the K-1th row in the mth column according to the S × T conversion units 12 13 converts the target detection digital signal, and the S × T conversion units 12 convert the digital signal group corresponding to the sensing unit group 11 of the Kth row in the mth column corresponding to the digital signal group corresponding to the The target detects the digital signal of the digital signal, and obtains the first of the digital signal group corresponding to the sensing unit group 11 of the K-1 row in the mth column converted by the S × T conversion units 12 A correction value, and according to the first correction value of the digital signal group corresponding to the sensing unit group 11 of the K-1th row in the mth column, correct the correspondences converted by the S × T conversion units 12 Each digital signal in the digital signal group of the sensing unit group 11 of the K-1 row in the mth column. It should be particularly noted that, in the first embodiment, the first correction value of the digital signal group of the sensing unit group 11 corresponding to the K-1th row in the mth column corresponds to the target detection digit The difference between the digital signal of the signal and the target detection digital signal, the processing unit 14 adds each digital signal in the digital signal group of the sensing unit group 11 of the K-1 row in the mth column to the corresponding The first correction value of the digital signal group of the sensing unit group 11 of the K-1th row in the mth column to correct the digital signal group of the sensing unit group 11 of the K-1th row in the mth column Every digital signal in.

In step 304, the processing unit 14 corrects the digital signal group generated by the sensing unit group 11 on the K-2th row, that is, sets x to K-2.

In step 305, when the processing unit 14 converts the sensing signal group of the sensing unit group 11 of the xth row in the mth column according to the S × T conversion units 12, the detection and conversion unit 13 detects The converted target detection digital signal, and the digital signal group of the sensing unit group 11 corresponding to the x + 1th row in the mth column converted by the S × T conversion units 12 corresponds to the target detection The digital signal of the digital signal and the first correction value of the digital signal group of the sensing unit group 11 corresponding to the x + 1th row in the mth column to obtain the sense corresponding to the xth row in the mth column The first correction value of the digital signal group of the measurement unit group 11 and correct the converted correspondence according to the first correction value of the digital signal group of the sensing unit group 11 corresponding to the xth row in the mth column Each digital signal in the digital signal group of the sensing unit group 11 in the xth row in the mth column. It should be particularly noted that, in the first embodiment, the first correction value of the digital signal group of the sensing unit group 11 corresponding to the x-th row in the m-th column corresponds to the target detection digital signal. The digital signal plus the difference between the first correction value of the digital signal group of the sensing unit group 11 corresponding to the x + 1th row in the mth column and the target detection digital signal.

In step 306, the processing unit 14 determines whether the sensing unit group 11 of the xth row is the sensing unit group 11 of the first row, that is, whether x = 1. When the processing unit 14 determines that the sensing unit group 11 in the xth row is not the sensing unit group 11 in the first row, the flow proceeds to step 307. When the processing unit 14 determines that the sensing unit group 11 in the xth row is the sensing unit group 11 in the first row, the flow proceeds to step 308.

In step 307, the processing unit 14 corrects the digital signal group generated by the sensing unit group 11 on the x-1th row, that is, sets x to x-1. After that, repeat steps 305 ~ 306 until x = 1.

In step 308, when the processing unit 14 converts the sensing signal group of the sensing unit group 11 of the Kth row in the mth column according to the S × T conversion units 12, the detection and conversion unit 13 detects The converted target detection digital signal, and the digital signal group of the sensing unit group 11 corresponding to the K + 1th row in the mth column converted by the S × T conversion units 12 corresponds to the digital signal group The target detects the digital signal of the digital signal, and obtains the first of the digital signal group corresponding to the sensing unit group 11 of the K + 1th row in the mth column converted by the S × T conversion units 12 Two correction values, and according to the second correction value of the digital signal group of the sensing unit group 11 corresponding to the K + 1th row in the mth column, correct the converted K + corresponding to the mth column Each digital signal in the digital signal group of the sensing unit group 11 of one line. It should be particularly noted that, in the first embodiment, the second correction value of the digital signal group of the sensing unit group 11 corresponding to the K + 1th row in the mth column is the target detection digital signal and Corresponding to the difference of the digital signals of the target detection digital signal, the processing unit 14 adds each digital signal in the digital signal group of the sensing unit group 11 of the K + 1th row in the mth column to the corresponding The first correction value of the digital signal group of the sensing unit group 11 of the K + 1th row in the mth column to correct the digital signal group of the sensing unit group 11 of the K-1th row of the mth column Every digital signal in.

In step 309, the processing unit 14 corrects the digital signal group generated by the sensing unit group 11 on the K + 2th row, that is, sets y to K + 2.

In step 310, the processing unit 14 detects the conversion unit according to the S × T conversion units 12 when converting the sensing signal group of the sensing unit group 11 of the y-1th row in the mth column The digital signal detected by the target detected by 13 and the S × T conversion units 12 converted by the sensing unit group 11 corresponding to the y-th row in the m-th column correspond to the target Detects the digital signal of the digital signal and the second correction value of the digital signal group of the sensing unit group 11 corresponding to the y-1th row in the mth column to obtain the corresponding y-th row in the mth column The second correction value of the digital signal group of the sensing unit group 11 and correct the converted value according to the second correction value of the digital signal group of the sensing unit group 11 corresponding to the y-th row in the m-th column Each digital signal in the digital signal group of the sensing unit group 11 corresponding to the y-th row in the m-th column. It should be particularly noted that, in the first embodiment, the second correction value of the digital signal group of the sensing unit group 11 corresponding to the y-th row in the m-th column is the target detection digital signal and the corresponding The difference between the digital signal of the target detection digital signal and the second correction value of the digital signal group corresponding to the sensing unit group 11 of the y-1th row in the mth column.

In step 311, the processing unit 14 determines whether the sensing unit group 11 of the y-th row is the sensing unit group 11 of the N / T-row, that is, whether y = N / T. When the processing unit 14 determines that the sensing unit group 11 of the y-th row is not the sensing unit group 11 of the N / T-row, the flow proceeds to step 312. When the processing unit 14 determines that the sensing unit group 11 of the y-th row is the sensing unit group 11 of the first row, the flow proceeds to step 313.

In step 312, the processing unit 14 corrects the digital signal group generated by the sensing unit group 11 of the y + 1th row, that is, y is set to y + 1. Thereafter, steps 310 to 311 are repeated until y = N / T.

In step 313, the processing unit 14 determines whether the sensing unit group 11 in the mth column is the sensing unit group 11 in the M / Sth column, that is, whether m = M / S. When the processing unit 14 determines that the sensing unit group 11 of the mth column is not the sensing unit group 11 of the M / Sth column, the flow proceeds to step 314. When the processing unit 14 determines that the sensing unit group 11 in the mth column is the sensing unit group 11 in the M / Sth column, the flow ends.

In step 314, for the sensing unit group 11 of the m + 1th row, that is, m is set to m + 1. Thereafter, steps 302 to 313 are repeated until m = M / S.

The second embodiment of the noise suppression method of the fingerprint collection device of the present invention is essentially a variation of the first embodiment, and includes a digital signal generation procedure and a calibration procedure. The digital signal generation procedure includes steps 401-408 (such as FIG. 5), wherein steps 401 to 403 and 405 to 408 are similar to steps 201 to 203 and 205 to 208 of the first embodiment respectively (see FIG. 3). The calibration procedure includes steps 501 to 514 (see FIG. 6), where steps 501, 502, 504, 506, 507, 509, and 511 to 514 are similar to steps 301, 302, 304, 306, 307 of the first embodiment, respectively , 309 and 311 ~ 314 (see Figure 4).

Referring to FIG. 1 and FIG. 5, the following describes the difference between the digital signal generation procedure of the second embodiment and the digital signal generation procedure of the first embodiment.

In step 404, the processing unit 14 controls the S × T conversion units 12 to convert the sensing signal group into a digital signal group including S × T digital signals, and controls the S × T in the processing unit 14 At the same time, the conversion unit 12 converts the sensing signal group of the sensing unit group 11 of the mth column and nth row, the processing unit 14 also controls the detection and conversion unit 13 to switch over the current conversion sensing unit group 11 The sensing signal generated by the sensing unit 111 in the sensing unit group 11 of one row is a detection digital signal.

Referring to FIGS. 1 and 6, the following describes the correction procedure of the second embodiment that is different from the correction procedure of the first embodiment.

In step 503, when the processing unit 14 converts the sensing signal group of the sensing unit group 11 of the Kth row in the mth column according to the S × T conversion units 12, the detection and conversion unit 13 detects The converted target detection digital signal, and the digital signal group converted by the S × T conversion units 12 corresponding to the sensing unit group 11 of the K-1th row in the mth column corresponds to the The target detects the digital signal of the digital signal, and obtains the first of the digital signal group corresponding to the sensing unit group 11 of the K-1 row in the mth column converted by the S × T conversion units 12 A correction value, and according to the first correction value of the digital signal group corresponding to the sensing unit group 11 of the K-1th row in the mth column, correct the correspondences converted by the S × T conversion units 12 Each digital signal in the digital signal group of the sensing unit group 11 of the K-1 row in the mth column. It should be particularly noted that, in the second embodiment, the first correction value of the digital signal group corresponding to the sensing unit group 11 of the K-1th row in the mth column is the target detection digital signal and The difference of the digital signal corresponding to the target detected digital signal.

In step 505, the processing unit 14 detects the conversion unit when converting the sensing signal group of the sensing unit group 11 of the x + 1 row in the mth column according to the S × T conversion units 12 The target detection digital signal converted by 13 and the S × T conversion units 12 converted by the sensing unit group 11 corresponding to the xth row in the mth column correspond to the target detection in the digital signal group 11 The digital signal of the digital signal and the first correction value of the digital signal group of the sensing unit group 11 corresponding to the x + 1th row in the mth column to obtain the sense corresponding to the xth row in the mth column The first correction value of the digital signal group of the measurement unit group 11 and correct the converted correspondence according to the first correction value of the digital signal group of the sensing unit group 11 corresponding to the xth row in the mth column Each digital signal in the digital signal group of the sensing unit group 11 in the xth row in the mth column. It should be particularly noted that, in the second embodiment, the first correction value of the digital signal group corresponding to the sensing unit group 11 of the xth row in the mth column is the target detection digital signal plus the corresponding The difference between the first correction value of the digital signal group of the sensing unit group 11 in the x + 1 row in the mth column and the digital signal corresponding to the target detection digital signal.

In step 508, the processing unit 14 detects the conversion unit according to the S × T conversion units 12 when converting the sensing signal group of the sensing unit group 11 of the K + 1th row in the mth column 13 converts the target detection digital signal, and corresponds to the digital signal group of the sensing unit group 11 converted by the S × T conversion units 12 corresponding to the K + 1th row in the mth column The digital signal of the digital signal is detected at the target to obtain the digital signal group corresponding to the sensing unit group 11 corresponding to the K + 1th row in the mth column converted by the S × T conversion units 12 The second correction value, and according to the second correction value of the digital signal group corresponding to the sensing unit group 11 of the K + 1th row in the mth column, correct the converted value corresponding to the mth in the mth column Each digital signal in the digital signal group of the sensing unit group 11 of the K + 1 row. It should be particularly noted that, in the second embodiment, the second correction value of the digital signal group of the sensing unit group 11 corresponding to the K + 1th row in the mth column corresponds to the target detection digit The difference between the digital signal of the signal and the digital signal detected by the target.

In step 510, the processing unit 14 converts the detection conversion unit 13 according to the S × T conversion units when converting the sensing signal group of the sensing unit group 11 of the y-th row in the m-th column The detected digital signal of the target, the digital signal group of the sensing unit group 11 corresponding to the y-1th row in the mth column converted by the S × T conversion units 12 corresponds to the target detection The digital signal of the digital signal and the second correction value of the digital signal group of the sensing unit group 11 corresponding to the y-1th row in the mth column to obtain the sense corresponding to the yth row in the mth column The second correction value of the digital signal group of the measurement unit group 11 and correct the converted correspondence according to the second correction value of the digital signal group of the sensing unit group 11 corresponding to the y-th row in the m-th column Each digital signal in the digital signal group of the sensing unit group 11 in the y-th row in the m-th column. It should be particularly noted that in the second embodiment, the second correction value of the digital signal group of the sensing unit group 11 corresponding to the y-th row in the m-th column corresponds to that of the target detection digital signal The digital signal is added to the difference between the second correction value of the digital signal group of the sensing unit group 11 corresponding to the y-1th row in the mth column and the target detection digital signal.

The third embodiment of the noise suppression method of the fingerprint collection device of the present invention includes a digital signal generation procedure and a calibration procedure. The digital signal generation procedure includes steps 601-608 (see FIG. 7), of which steps 601-603 and 605 ~ 608 is similar to steps 201-203 and 205-208 of the first embodiment respectively (see FIG. 3).

Referring to FIGS. 1 and 7, the following describes the digital signal generation process of the third embodiment that is different from the digital signal generation process of the first embodiment.

In step 604, the processing unit 14 controls the S × T conversion units 12 to convert the sensing signal group into a digital signal group including S × T digital signals, and controls the S × T in the processing unit 14 At the same time, the conversion unit 12 converts the sensing signal group of the sensing unit group 11 in the mth column and nth row, the processing unit 14 also controls the detection conversion unit 13 to switch under the current conversion sensing unit group 11 The sensing signal generated by the sensing unit 111 in the sensing unit group 11 of a row is a digital detection signal.

Referring to FIG. 1 and FIG. 8, the following describes the flow of steps of the fingerprint collection device 1 implementing the calibration procedure of the third embodiment.

In step 701, the processing unit 14 corrects the digital signal group generated by the sensing unit group 11 of the first row, that is, sets n to 1.

In step 702, the processing unit 14 selects the digital signal group corresponding to the sensing unit group 11 of the Kth column in the nth row converted by the S × T conversion units 12 as the reference digital signal Group, where K 1 ~ (M / S).

In step 703, the processing unit 14 detects the conversion unit when converting the sensing signal group of the sensing unit group 11 of the K-1 column in the nth row according to the S × T conversion units 12 13 converts the target detection digital signal, and the S × T conversion units 12 convert the digital signal group corresponding to the sensing unit group 11 of the Kth column in the nth row corresponding to the digital signal group corresponding to the The target detects the digital signal of the digital signal, and obtains the digital signal group corresponding to the sensing unit group 11 of the K-1 column in the nth row converted by the S × T conversion units 12 A correction value, and correct the correspondences converted by the S × T conversion units 12 according to the first correction value of the digital signal group corresponding to the sensing unit group 11 of the K-1 column in the nth row Each digital signal in the digital signal group of the sensing unit group 11 in the K-1 column in the nth row. It should be particularly noted that, in the third embodiment, the first correction value of the digital signal group of the sensing unit group 11 corresponding to the K-1th column in the nth row corresponds to the target detection digit The difference between the digital signal of the signal and the target detection digital signal, the processing unit 14 adds each digital signal in the digital signal group of the sensing unit group 11 of the K-1 column in the nth row to the corresponding The first correction value of the digital signal group of the sensing unit group 11 of the K-1 column in the nth row to correct the digital signal group of the sensing unit group 11 of the K-1 column in the nth row Every digital signal in.

In step 704, the processing unit 14 corrects the digital signal group generated by the sensing unit group 11 in the K-2 column, that is, sets x to K-2.

In step 705, according to the S × T conversion units 12 converting the sensing signal group of the sensing unit group 11 in the nth row and the xth column, the processing unit 14 detects The converted target detection digital signal, and the digital signal group converted by the S × T conversion units 12 corresponding to the sensing unit group 11 in the x + 1th column in the nth row corresponds to the target detection The digital signal of the digital signal is measured, and the first correction value of the digital signal group of the sensing unit group 11 corresponding to the x + 1th column in the nth row to obtain the sense corresponding to the xth column in the nth row The first correction value of the digital signal group of the measurement unit group 11 and correct the converted correspondence according to the first correction value of the digital signal group of the sensing unit group 11 corresponding to the xth column in the nth row Each digital signal in the digital signal group of the sensing unit group 11 in the xth column in the nth row. It should be particularly noted that in the third embodiment, the first correction value of the digital signal group corresponding to the sensing unit group 11 of the xth column in the nth row corresponds to the target detection digital signal The digital signal is added to the difference between the first correction value of the digital signal group corresponding to the sensing unit group 11 of the x + 1 column in the nth row and the target detection digital signal.

In step 706, the processing unit 14 determines whether the sensing unit group 11 in the x-th column is the sensing unit group 11 in the first column, that is, whether x = 1. When the processing unit 14 determines that the sensing unit group 11 in the xth row is not the sensing unit group 11 in the first row, the flow proceeds to step 707. When the processing unit 14 determines that the sensing cell group 11 in the xth column is the sensing cell group 11 in the first column, the flow proceeds to step 708.

In step 707, the processing unit 14 corrects the digital signal group generated by the sensing unit group 11 in the x-1 column, that is, sets x to x-1. After that, steps 705 ~ 706 are repeated until x = 1.

In step 708, according to the S × T conversion units 12 when converting the sensing signal group of the sensing unit group 11 of the Kth column in the nth row, the processing unit 14 detects The converted target detection digital signal, and the digital signal group converted by the S × T conversion units 12 corresponding to the sensing unit group 11 of the K + 1th column in the nth row corresponds to the digital signal group The target detects the digital signal of the digital signal, and obtains the first of the digital signal group corresponding to the sensing unit group 11 of the K + 1th column in the nth row converted by the S × T conversion units 12 Two correction values, and according to the second correction value of the digital signal group corresponding to the sensing unit group 11 of the K + 1 column in the nth row, correct the converted K + corresponding to the nth row Each digital signal in the digital signal group of the sensing unit group 11 of one row. It is important to note that in the third embodiment, the second correction value of the digital signal group corresponding to the sensing unit group 11 of the K + 1th column in the nth row is the target detection digital signal and Corresponding to the difference of the digital signals of the target detection digital signal, the processing unit 14 adds each digital signal in the digital signal group of the sensing unit group 11 of the K + 1 column in the nth row to the corresponding The first correction value of the digital signal group of the sensing unit group 11 in the K + 1 column in the nth row to correct the digital signal group of the sensing unit group 11 in the K-1 column in the nth row Every digital signal in.

In step 709, the processing unit 14 corrects the digital signal group generated by the sensing unit group 11 in the K + 2th column, that is, sets y to K + 2.

In step 710, the processing unit 14 detects the conversion unit when converting the sensing signal group of the sensing unit group 11 of the y-1 column in the nth row according to the S × T conversion units 12 The converted digital signal of the target detected by 13 and the digital signal group of the sensing unit group 11 converted by the S × T conversion units 12 corresponding to the y-th column in the nth row corresponds to the target Detects the digital signal of the digital signal and the second correction value of the digital signal group corresponding to the sensing unit group 11 of the y-1 column in the nth row to obtain the corresponding y column in the nth row The second correction value of the digital signal group of the sensing unit group 11 and correct the converted value according to the second correction value of the digital signal group of the sensing unit group 11 corresponding to the yth column in the nth row Each digital signal in the digital signal group of the sensing unit group 11 corresponding to the y column in the nth row. It should be particularly noted that, in the third embodiment, the second correction value of the digital signal group corresponding to the sensing unit group 11 of the y-th column in the n-th row is the target detection digital signal and the corresponding The difference between the digital signal of the target detection digital signal and the second correction value of the digital signal group corresponding to the sensing unit group 11 of the y-1 column in the nth row.

In step 711, the processing unit 14 determines whether the sensing unit group 11 in the y-th row is the sensing unit group 11 in the M / S-row, that is, whether y = M / S. When the processing unit 14 determines that the sensing unit group 11 of the y-th row is not the sensing unit group 11 of the M / S-th row, the flow proceeds to step 712. When the processing unit 14 determines that the sensing unit group 11 in the y-th column is the sensing unit group 11 in the first column, the flow proceeds to step 713.

In step 712, the processing unit 14 corrects the digital signal group generated by the sensing unit group 11 of the y + 1th column, that is, sets y + 1 to y + 1. Thereafter, steps 710 to 711 are repeated until y = M / S.

In step 713, the processing unit 14 determines whether the sensing unit group 11 of the nth row is the sensing unit group 11 of the N / T row, that is, whether n = N / T. When the processing unit 14 determines that the sensing unit group 11 of the nth row is not the sensing unit group 11 of the N / T row, the flow proceeds to step 714. When the processing unit 14 determines that the sensing unit group 11 of the nth row is the sensing unit group 11 of the N / T row, the flow ends.

In step 714, for the sensing unit group 11 of the n + 1th row, n is set to n + 1. After that, steps 702 to 713 are repeated until n = N / T.

The fourth embodiment of the noise suppression method of the fingerprint collection device of the present invention is essentially a variation of the third embodiment, and includes a digital signal generation procedure and a correction procedure. The digital signal generation procedure includes steps 801-808 (such as FIG. 9), wherein steps 801-803 and 805-808 are similar to steps 601-603 and 605-608 of the third embodiment respectively (see FIG. 3). The calibration procedure includes steps 901 to 914 (see FIG. 10), where steps 901, 902, 904, 906, 907, 909, and 911 to 914 are similar to steps 701, 702, 704, 706, 707 of the third embodiment, respectively , 709 and 711 ~ 714 (see Figure 4).

Referring to FIG. 1 and FIG. 9, the following describes the difference between the digital signal generation procedure of the fourth embodiment and the digital signal generation procedure of the third embodiment.

In step 804, the processing unit 14 controls the S × T conversion units 12 to convert the sensing signal group into a digital signal group including S × T pen digital signals, and controls the S × T in the processing unit 14 At the same time, the conversion unit 12 converts the sensing signal group of the sensing unit group 11 of the mth column and nth row, the processing unit 14 also controls the detection and conversion unit 13 to switch over the current conversion sensing unit group 11 The sensing signal generated by the sensing unit 111 in the sensing unit group 11 of a row is a digital detection signal.

Referring to FIGS. 1 and 6, the following describes the correction procedure of the fourth embodiment that is different from the correction procedure of the third embodiment.

In step 903, when the processing unit 14 converts the sensing signal group of the sensing unit group 11 of the Kth column in the nth row according to the S × T conversion units 12, the detection and conversion unit 13 detects The converted target detection digital signal, and the digital signal group converted by the S × T conversion units 12 corresponding to the sensing unit group 11 of the K-1th column in the nth row corresponds to the digital signal group The target detects the digital signal of the digital signal, and obtains the digital signal group corresponding to the sensing unit group 11 of the K-1 column in the nth row converted by the S × T conversion units 12 A correction value, and correct the correspondences converted by the S × T conversion units 12 according to the first correction value of the digital signal group corresponding to the sensing unit group 11 of the K-1 column in the nth row Each digital signal in the digital signal group of the sensing unit group 11 in the K-1 column in the nth row. It should be particularly noted that, in the fourth embodiment, the first correction value of the digital signal group corresponding to the sensing unit group 11 of the K-1 column in the nth row is the target detection digital signal and The difference of the digital signal corresponding to the target detected digital signal.

In step 905, the processing unit 14 detects the conversion unit when converting the sensing signal group of the sensing unit group 11 of the x + 1 column in the nth row according to the S × T conversion units 12 The target detection digital signal converted by 13 and the S × T conversion units 12 converted by the sensing unit group 11 corresponding to the xth column in the nth row correspond to the target detection in the digital signal group 11 The digital signal of the digital signal is measured, and the first correction value of the digital signal group of the sensing unit group 11 corresponding to the x + 1th column in the nth row to obtain the sense corresponding to the xth column in the nth row The first correction value of the digital signal group of the measurement unit group 11 and correct the converted correspondence according to the first correction value of the digital signal group of the sensing unit group 11 corresponding to the xth column in the nth row Each digital signal in the digital signal group of the sensing unit group 11 in the xth column in the nth row. It should be particularly noted that, in the fourth embodiment, the first correction value of the digital signal group corresponding to the sensing unit group 11 of the xth column in the nth row is the target detection digital signal plus the corresponding The difference between the first correction value of the digital signal group of the sensing unit group 11 in the x + 1 column in the nth row and the digital signal corresponding to the target detection digital signal.

In step 908, the processing unit 14 detects the conversion unit according to the S × T conversion units 12 when converting the sensing signal group of the sensor unit group 11 of the K + 1 column in the nth row 13 converts the target detection digital signal, and corresponds to the digital signal group converted by the S × T conversion units 12 corresponding to the sensing unit group 11 of the K + 1th column in the nth row Detect the digital signal of the digital signal at the target to obtain the digital signal group corresponding to the sensing unit group 11 corresponding to the K + 1th column in the nth row converted by the S × T conversion units 12 And the second correction value corresponding to the digital signal group of the sensing unit group 11 corresponding to the K + 1th column in the nth row, correcting the converted value corresponding to the nth in the nth row Each digital signal in the digital signal group of the sensing unit group 11 of the K + 1 row. It should be particularly noted that, in the fourth embodiment, the second correction value of the digital signal group of the sensing unit group 11 corresponding to the K + 1th column in the nth row corresponds to the target detection digit The difference between the digital signal of the signal and the digital signal detected by the target.

In step 910, the processing unit 14 detects the signal conversion group of the sensor unit group 11 of the y-th column in the nth row according to the S × T conversion units 12 The converted target detects the digital signal, and the digital signal group corresponding to the sensing unit group 11 of the y-1 column in the nth row converted by the S × T conversion units 12 corresponds to the target Detects the digital signal of the digital signal and the second correction value of the digital signal group corresponding to the sensing unit group 11 of the y-1 column in the nth row to obtain the corresponding y column in the nth row The second correction value of the digital signal group of the sensing unit group 11 and correct the converted value according to the second correction value of the digital signal group of the sensing unit group 11 corresponding to the yth column in the nth row Each digital signal in the digital signal group of the sensing unit group 11 corresponding to the y column in the nth row. It should be particularly noted that, in the fourth embodiment, the second correction value of the digital signal group corresponding to the sensing unit group 11 of the y-th column in the nth row corresponds to the target detection digital signal. The digital signal is added to the difference between the second correction value of the digital signal group corresponding to the sensing unit group 11 of the y-1 column in the nth row and the target detection digital signal.

It should be particularly noted that, in other embodiments, the fingerprint collection device 1 may include multiple detection and conversion units 13. Referring to FIGS. 1 and 11, for example, assume that the fingerprint collection device 1 includes two detection conversion units 13, and M = 3, N = 9, S = 1, and T = 3. The processing unit 14 controls the 1 × 3 conversion units 12 to convert the sensing signals generated by the (1,1) (1,2) (1,3) sensing unit 111 while controlling the detection conversion units 13 Convert (1, 4) (2, 2) the sensing signal generated by the sensing unit 111. Similarly, when the 1 × 3 conversion units 12 convert (1, 4) (1, 5) (1, 6) the sensing signal generated by the sensing unit 111, the detection conversion units 13 are simultaneously controlled to convert ( 1,7) (2,5) If there is no adjacent sensing unit on the right or below of the sensing signal generated by the sensing unit 111, the detection and conversion units 13 are not converted, and so on. The processing unit 14 selects the (1,1) (1,2) (1,3) sensing unit as the reference digital signal group.

Taking the first column as an example, when the processing unit 14 converts the digital signal group in the first column and the first row according to the 1 × 3 conversion units 12, one of the detection conversion units 13 converts (1, 4 ) The digital signal generated by the sensing signal generated by the sensing unit 111, and the 1 × 3 conversion units 12 when converting the digital signal group in the first column and the second row, the 1 × 3 conversion units 12 One of them converts (1, 4) the difference between the digital signals generated by the sensing signals generated by the sensing unit 111 to obtain the correction value of the digital signal group in the first column and the second row. The processing unit 14 converts (1, 7) the sensing unit 111 generated by one of the detection conversion units 13 according to the 1 × 3 conversion units 12 when converting the digital signal group in the first column and the second row The digital signal generated by the sensing signal plus the correction value of the digital signal group in the first column and the second row, and the 1 × 3 conversion units 12 when converting the digital signal group in the first column and the third row, the One of the 1 × 3 conversion units 12 converts the difference of the digital signals generated by the (1, 7) sensing signals generated by the sensing unit 111 to obtain the correction value of the digital signal group in the first column and the third row.

Taking the first line as an example, the processing unit 14 converts one of the detection conversion units 13 according to the 1 × 3 conversion units 12 when converting the digital signal group in the first column and the first row (2, 2) The digital signal generated by the sensing signal generated by the sensing unit 111 and the 1 × 3 conversion units 12 convert the digital signal group of the second column and the first row when the 1 × 3 conversion units 12 convert One converts the difference of the digital signals generated by the sensing signals generated by the (2, 2) sensing unit 111 to obtain the correction value of the digital signal group in the second column and the first row. The processing unit 14 converts the (3, 2) sensing unit 111 generated by one of the detection conversion units 13 according to the 1 × 3 conversion units 12 when converting the digital signal group in the second column and the first row The digital signal generated by the sensing signal plus the correction value of the digital signal group in the second column and first row, and the 1 × 3 conversion units 12 when converting the digital signal group in the third column and first row, the One of the 1 × 3 conversion units 12 converts the difference of the digital signals generated by the (3, 2) sensing unit 111 to obtain the correction value of the digital signal group in the third column and the first row.

In summary, the noise suppression method of the fingerprint collection device of the present invention is generated by the processing unit 14 controlling the S × T conversion units 12 and the detection conversion unit 13 to convert the same sensing unit 111 at different times Sensing signals to obtain the first correction value and the second correction value, thereby correcting the digital signal group except the reference digital signal group with the first correction value and the second correction value to reduce the The common mode noise of the fingerprint collection device 1 can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention, and the scope of implementation of the present invention cannot be limited by this, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still classified as Within the scope of the invention patent.

1‧‧‧ Fingerprint collection device
301 ~ 314‧‧‧Step
11‧‧‧Sense unit group
401 ~ 408‧‧‧Step
111‧‧‧sensing unit
501 ~ 514‧‧‧Step
12‧‧‧ Conversion unit
601 ~ 608‧‧‧Step
13‧‧‧detect conversion unit
701 ~ 714‧‧‧ steps
14‧‧‧Processing unit
801 ~ 808‧‧‧Step
201 ~ 208‧‧‧Step
901 ~ 914‧‧‧Step

Other features and functions of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: FIG. 1 is a block diagram illustrating a fingerprint collection device used to implement the noise suppression method of the fingerprint collection device of the present invention FIG. 2 is a schematic diagram illustrating the sensing unit of the M × N array of the fingerprint collection device; FIG. 3 is a flowchart illustrating a digital signal of a first embodiment of the noise suppression method of the fingerprint collection device of the present invention Generation procedure; FIG. 4 is a flowchart illustrating a correction procedure of the first embodiment of the noise suppression method of the fingerprint collection device of the present invention; FIG. 5 is a flowchart illustrating the noise suppression method of the fingerprint collection device of the present invention A digital signal generation procedure of a second embodiment of FIG .; FIG. 6 is a flowchart illustrating a correction procedure of the second embodiment of the noise suppression method of the fingerprint collection device of the present invention; FIG. 7 is a flowchart illustrating A digital signal generation procedure of a third embodiment of the noise suppression method of the fingerprint collection device of the present invention; FIG. 8 is a flowchart illustrating the fingerprint of the present invention A correction procedure of the third embodiment of the noise suppression method of the set device; FIG. 9 is a flowchart illustrating a digital signal generation procedure of a fourth embodiment of the noise suppression method of the fingerprint collection device of the present invention; 10 is a flowchart illustrating a calibration procedure of the third embodiment of the noise suppression method of the fingerprint collection device of the present invention; and FIG. 11 is a schematic diagram illustrating the 3 × 9 array sensing unit of the fingerprint collection device.

Claims (12)

A noise suppression method for a fingerprint collection device is implemented by a fingerprint collection device, which includes an M × N array sensing unit, an S × T array conversion unit, a detection conversion unit, and a processing unit, The sensing unit is connected to the S × T conversion units and the detection conversion unit, and the processing unit is electrically connected to the S × T conversion units and the detection conversion unit, and each sensing unit is used to generate a sum Sensing signal, where M is a multiple of S, N is a multiple of T, and M × N> S × T, the sensing units of the M × N array can be divided into (M / S) × (N / T) The sensing unit group of the array, each sensing unit group includes S × T sensing units, and the noise suppression method of the fingerprint collection device includes the following steps: (A) The processing unit controls the S × T units The conversion unit sequentially converts a sense generated by the S × T sensing units in each of the N / T sensing unit groups in one of the M / S rows to include the S × T pen sensing signal The measurement signal group is a digital signal group including S × T digital signals, and the S × T conversion units are controlled by the processing unit to convert the first to (N / T) -1 At the same time as the sensing signal group of the sensing unit group, the processing unit also controls the detection conversion unit to convert the current conversion sensing unit group adjacent to the S × T conversion units being converted A sensing signal generated by a sensing unit in the sensing unit group in the row below the currently converted sensing unit group is a detected digital signal; (B) Select the converted one corresponding to the row The digital signal group of the sensing unit group of the Kth row in the sensing unit group of the N / T row serves as a reference digital signal group, K

1 ~ (N / T); and (C) For each of the converted digital signal groups corresponding to the sensing unit group in the i-th row in the column, i = 1 ~ K-1, the process The unit detects the digital signal converted by the detection conversion unit at least when the S × T conversion units convert the sensing signal group of the sensing unit group in the i-th row of the column, and the The digital signal corresponding to the target detected digital signal in the digital signal group converted by the S × T conversion units corresponding to the sensing unit group in the i + 1th row of the column is obtained corresponding to the converted digital signal A first correction value of the digital signal group of the sensing unit group corresponding to the i-th row in the column, and according to the digital signal group of the digital signal group corresponding to the i-th row of the column A correction value for correcting each digital signal in the digital signal group of the sensing unit group corresponding to the i-th row in the column, and for the converted digital signal corresponding to the j-th row in the column Each of the digital signal groups of the sensing unit group of j = K + 1 ~ (N / T), the processing unit converts the row at least according to the S × T conversion units In the sensing signal group of the sensing unit group in the j-1th row, the target detection digital signal converted by the detection conversion unit, and the corresponding ones converted by the S × T conversion units correspond to the In the digital signal group of the sensing unit group in the jth row of the column, the digital signal corresponding to the target detection digital signal is obtained to obtain the converted sensing unit group corresponding to the jth row in the column A second correction value of the digital signal group of the digital signal group, and according to the second correction value of the digital signal group of the sensing unit group corresponding to the jth row in the column, correct the converted value corresponding to the column Each digital signal in the digital signal group of the sensing unit group in the jth row. The noise suppression method of the fingerprint collection device according to claim 1, wherein, in step (C), for the converted sensing unit group corresponding to the K-1th row in the column, the processing The unit detects digital signals converted by the detection conversion unit when converting the sensing signal group of the sensing unit group of the K-1th row in the column according to the S × T conversion units, and The digital signals corresponding to the target detected digital signal in the digital signal group of the sensing unit group converted by the S × T conversion units corresponding to the K-th row in the column are obtained corresponding to the converted The first correction value of the digital signal group of the sensing unit group corresponding to the K-1th row in the column, and according to the digital signal of the sensing unit group corresponding to the K-1th row in the column The first correction value of the group corrects each digital signal in the converted digital signal group of the sensing unit group corresponding to the K-1th row in the column. For the converted digital signal corresponding to the row The sensing unit group of the K + 1th row, the processing unit converts the column according to the S × T conversion units In the sensing signal group of the sensing unit group in the Kth row, the target detection digital signal converted by the detection conversion unit, and the S × T conversion units corresponding to the corresponding ones in the column In the digital signal group of the sensing unit group of the K + 1th row, the digital signal corresponding to the target detected digital signal is obtained corresponding to the converted sensing unit group corresponding to the K + 1th row in the column The second correction value of the digital signal group of the group is corrected according to the second correction value of the digital signal group of the sensing unit group corresponding to the K + 1th row in the column. Each digital signal in the digital signal group of the sensing unit group in the K + 1th row, and for each of the converted digital signal groups corresponding to the sensing unit group in the xth row in the column , X = 1 ~ K-2, the processing unit converts the detection conversion unit according to the S × T conversion units when converting the sensing signal group of the sensing unit group in the xth row in the column The detected target digital signal and the S × T conversion units corresponding to the sensing unit corresponding to the x + 1th row in the column In the digital signal group of the group, the digital signal corresponding to the target detected digital signal and the first correction value of the digital signal group corresponding to the sensing unit group in the x + 1th row in the column are obtained corresponding to the The first correction value of the digital signal group of the sensing unit group in the x-th row of the column, and is corrected according to the first correction value of the digital signal group corresponding to the sensing unit group in the x-th row of the column Each digital signal in the converted digital signal group corresponding to the sensing unit group in the xth row in the column, and for the converted sensing unit group corresponding to the yth row in the column Each of the digital signal groups of the group, y = K + 2 ~ (N / T), the processing unit converts the sensing unit group of the y-1th row in the column according to the S × T conversion units Sense signal group, the target detection digital signal converted by the detection conversion unit, the S × T conversion units converted corresponding to the sensing unit group of the y-th row in the column The digital signal corresponding to the target detection digital signal in the digital signal group, and the sensing unit group corresponding to the y-1th row in the column The second correction value of the digital signal group of the digital signal group to obtain the second correction value of the digital signal group of the sensing unit group corresponding to the y-th row in the column, and according to the sense corresponding to the y-row of the column The second correction value of the digital signal group of the measuring unit group corrects each digital signal in the digital signal group of the sensing unit group corresponding to the y-th row in the column. The noise suppression method of the fingerprint collection device as described in claim 1, after step (C), further includes the following steps: (D) Repeat steps (A), (B), and (C) until each row of N / The sensing signals of the sensing units of the T sensing unit groups have all been converted, and the digital signal groups corresponding to each row except the reference digital signal group have been calibrated. A noise suppression method for a fingerprint collection device is implemented by a fingerprint collection device, which includes an M × N array sensing unit, an S × T array conversion unit, a detection conversion unit, and a processing unit, The sensing unit is connected to the S × T conversion units and the detection conversion unit, and the processing unit is electrically connected to the S × T conversion units and the detection conversion unit, and each sensing unit is used to generate a sum Sensing signal, where M is a multiple of S, N is a multiple of T, and M × N> S × T, the sensing units of the M × N array can be divided into (M / S) × (N / T) The sensing unit group of the array, each sensing unit group includes S × T sensing units, and the noise suppression method of the fingerprint collection device includes the following steps: (A) The processing unit controls the S × T units The conversion unit sequentially converts a sense generated by the S × T sensing units in each of the N / T sensing unit groups in one of the M / S rows to include the S × T pen sensing signal The measurement signal group is a digital signal group including S × T digital signals, and the S × T conversion units are controlled by the processing unit to convert the first to (N / T) -1 At the same time as the sensing signal group of the sensing unit group of the, the processing unit also controls the detection conversion unit to convert the current conversion sensing unit group adjacent to the S × T conversion units being converted and is located in the A sensing signal generated by a sensing unit in the sensing unit group on the row above the current sensing unit group is a digital detection signal; (B) Select the converted one corresponding to the row The digital signal group of the sensing unit group of the Kth row in the sensing unit group of the N / T row serves as a reference digital signal group, K

1 ~ (N / T); and (C) For each of the converted digital signal groups corresponding to the sensing unit group in the i-th row in the column, i = 1 ~ K-1, the process The unit detects the digital signal of the target converted by the detection conversion unit at least when the S × T conversion units convert the sensing signal group of the sensing unit group of the i + 1th row in the column, And the digital signal corresponding to the target detected digital signal in the digital signal group converted by the S × T conversion units corresponding to the sensing unit group in the i-th row of the column to obtain the corresponding digital signal corresponding to the target detected digital signal A first correction value of the digital signal group of the sensing unit group corresponding to the i-th row in the column, and according to the digital signal group of the sensing unit group corresponding to the i-th row of the column The first correction value corrects each digital signal in the digital signal group of the sensing unit group corresponding to the i-th row in the column, and for the converted digital signal corresponding to the j-th in the column Each of the digital signal groups of the sensing unit group of the row, j = K + 1 ~ (N / T), the processing unit converts the digital signal group according to at least the S × T conversion units In the sensing signal group of the sensing unit group in the j-th row of the target, the target detection digital signal converted by the detection conversion unit, and the conversion of the S × T conversion units corresponding to the column In the digital signal group of the sensing unit group of the j-1th row in the middle, the digital signal corresponding to the target detection digital signal is obtained to obtain the converted sensing unit group corresponding to the jth row in the column A second correction value of the digital signal group of the group, and according to the second correction value of the digital signal group of the sensing unit group corresponding to the jth row in the column, correcting the converted corresponding to the column Each digital signal in the digital signal group of the sensing unit group in the jth row. The noise suppression method of the fingerprint collection device according to claim 4, wherein in step (C), for the converted sensing unit group corresponding to the K-1th row in the column, the processing The unit detects the digital signal converted by the detection and conversion unit when the S × T conversion units convert the sensing signal group of the sensing unit group of the Kth row in the column, and the The digital signal corresponding to the target detected digital signal in the digital signal group converted by the S × T conversion units corresponding to the sensing unit group of the K-1th row in the column is obtained corresponding to the converted digital signal The first correction value of the digital signal group of the sensing unit group corresponding to the K-1th row in the column, and according to the digital signal group of the sensing unit group corresponding to the K-1th row of the column The first correction value corrects each digital signal in the digital signal group of the sensing unit group corresponding to the K-1th row in the column. For the converted digital signal corresponding to the The sensing unit group of K + 1 row, the processing unit converts one of the columns in the column according to the S × T conversion units In the sensing signal group of the sensing unit group of the K + 1 row, the target detection digital signal converted by the detection conversion unit, and the conversions of the S × T conversion units corresponding to the row In the digital signal group of the sensing unit group in the Kth row, the digital signal corresponding to the target detection digital signal is obtained to obtain the converted sensing unit group corresponding to the converted K + 1 row in the column The second correction value of the digital signal group of the group is corrected according to the second correction value of the digital signal group of the sensing unit group corresponding to the K + 1th row in the column. Each digital signal in the digital signal group of the sensing unit group in the K + 1th row, and for each of the converted digital signal groups corresponding to the sensing unit group in the xth row in the column , X = 1 ~ K-2, the processing unit detects the conversion unit when converting the sensing signal group of the sensing unit group in the x + 1th row of the column according to the S × T conversion units The converted target detection digital signal and the sensing unit corresponding to the xth row in the column converted by the S × T conversion units In the digital signal group of the group, the digital signal corresponding to the target detected digital signal and the first correction value of the digital signal group corresponding to the sensing unit group in the x + 1th row in the column are obtained corresponding to the The first correction value of the digital signal group of the sensing unit group in the x-th row of the column, and is corrected according to the first correction value of the digital signal group corresponding to the sensing unit group in the x-th row of the column Each digital signal in the converted digital signal group corresponding to the sensing unit group in the xth row in the column, and for the converted sensing unit group corresponding to the yth row in the column Y = K + 2 ~ (N / T) of each of the digital signal groups of the group When measuring the signal group, the target detection digital signal converted by the detection conversion unit, the S × T conversion units converted corresponding to the sensing unit group of the y-1th row in the column The digital signal corresponding to the target detection digital signal in the digital signal group, and the sensing unit group corresponding to the y-1th row in the column The second correction value of the digital signal group of the digital signal group to obtain the second correction value of the digital signal group of the sensing unit group corresponding to the y-th row in the column, and according to the sense corresponding to the y-row of the column The second correction value of the digital signal group of the measuring unit group corrects each digital signal in the digital signal group of the sensing unit group corresponding to the y-th row in the column. The noise suppression method of the fingerprint collection device as described in claim 4, after step (C), further includes the following steps: (D) Repeat steps (A), (B) and (C) until each row has N / The sensing signals of the sensing units of the T sensing unit groups have all been converted, and the digital signal groups corresponding to each row except the reference digital signal group have been calibrated. A noise suppression method for a fingerprint collection device is implemented by a fingerprint collection device, which includes an M × N array sensing unit, an S × T array conversion unit, a detection conversion unit, and a processing unit, The sensing unit is connected to the S × T conversion units and the detection conversion unit, and the processing unit is electrically connected to the S × T conversion units and the detection conversion unit, and each sensing unit is used to generate a sum Sensing signal, where M is a multiple of S, N is a multiple of T, and M × N> S × T, the sensing units of the M × N array can be divided into (M / S) × (N / T) The sensing unit group of the array, each sensing unit group includes S × T sensing units, and the noise suppression method of the fingerprint collection device includes the following steps: (A) The processing unit controls the S × T units The conversion unit sequentially converts a sense generated by the S × T sensing units in each of the M / S sensing unit groups in one of the N / T rows to include an S × T pen sensing signal The test signal group is a digital signal group containing S × T digital signals, and the S × T conversion units are controlled by the processing unit to convert the first to (M / S) -1 At the same time as the sensing signal group of the sensing unit group of the, the processing unit also controls the detection conversion unit to convert the current conversion sensing unit group adjacent to the S × T conversion units being converted and is located in the A sensing signal generated by a sensing unit in a sensing unit group in a row under the currently converted sensing unit group is a digital detection signal; (B) Select the converted one corresponding to the row The digital signal group of the sensing unit group of the Kth row in the sensing unit group of the M / S row serves as a reference digital signal group, K

1 ~ (M / S); and (C) For each of the converted digital signal groups corresponding to the sensing unit group in the i-th column in the row, i = 1 ~ K-1, the processing The unit detects the digital signal converted by the detection conversion unit at least when the S × T conversion units convert the sensing signal group of the sensing unit group of the i-th column in the row, and the Wait for the digital signal corresponding to the target detected digital signal in the digital signal group converted by the S × T conversion units corresponding to the sensing unit group in the i + 1th column of the row to obtain the corresponding digital signal A first correction value of the digital signal group of the sensing unit group corresponding to the i-th column in the row, and according to the digital signal group of the sensing unit group corresponding to the i-th column in the row The first correction value corrects each digital signal in the converted digital signal group of the sensing unit group corresponding to the i-th column in the row, and for the converted digital signal corresponding to the j-th in the row Each of the digital signal groups of the sensing unit group of the row, j = K + 1 ~ (M / S), the processing unit converts the digital signal group at least according to the S × T conversion units In the sensing signal group of the sensing unit group in the j-1th column in the target, the target detection digital signal converted by the detection conversion unit, and the corresponding ones converted by the S × T conversion units correspond to In the digital signal group of the sensing unit group in the jth column of the row, the digital signal corresponding to the target detection digital signal is obtained to obtain the converted sensing unit group corresponding to the jth column in the row A second correction value of the digital signal group of the group, and according to the second correction value of the digital signal group of the sensing unit group corresponding to the jth column in the row, correct the converted corresponding to the row Each digital signal in the digital signal group of the sensing unit group in the jth column. The noise suppression method of the fingerprint collection device according to claim 7, wherein, in step (C), for the converted sensing unit group corresponding to the K-1th column in the row, the processing The unit detects the digital signal converted by the detection conversion unit according to the S × T conversion units when converting the sensing signal group of the sensing unit group of the K-1 column in the row, and The digital signals corresponding to the target detected digital signal in the digital signal group converted by the S × T conversion units corresponding to the sensing unit group of the Kth column in the row are obtained corresponding to the converted digital signal The first correction value of the digital signal group corresponding to the sensing unit group in the K-1 column in the row, and according to the digital signal group corresponding to the sensing unit group in the K-1 column in the row The first correction value corrects each digital signal in the digital signal group of the sensing unit group corresponding to the K-1th column in the row. For the converted digital signal corresponding to the row in the row The sensing unit group of K + 1 column, the processing unit converts one of the rows in the row according to the S × T conversion units In the sensing signal group of the sensing unit group of row K, the target detection digital signal converted by the detection conversion unit, and the conversion of the S × T conversion units corresponding to the first in the row In the digital signal group of the sensing unit group of the K + 1 column, the digital signal corresponding to the target detected digital signal is obtained corresponding to the converted sensing unit group corresponding to the K + 1th row in the row The second correction value of the digital signal group of the digital signal group corresponding to the K + 1 column in the row corresponds to the second correction value of the digital signal group of the sensing unit group corresponding to the row corresponding to the row Each digital signal in the digital signal group of the sensing unit group of the K + 1 column, and for each of the converted digital signal groups corresponding to the sensing unit group of the xth column in the row, x = 1 ~ K-2, when the processing unit converts the sensing signal group of the sensing unit group of the xth column in the row according to the S × T conversion units, the detection conversion unit converts The digital signal of the target detection and the S × T conversion units converted to the sensing unit group corresponding to the x + 1th column in the row The digital signal corresponding to the target detected digital signal in the digital signal group and the first correction value of the digital signal group corresponding to the sensing unit group in the x + 1th column in the row to obtain the row corresponding to the row The first correction value of the digital signal group of the sensing unit group in the x-th column in the row, and according to the first correction value of the digital signal group corresponding to the sensing unit group in the x-th column in the row Each digital signal in the converted digital signal group corresponding to the sensing unit group in the xth column of the row, and for the converted sensing unit group corresponding to the yth column in the row Each of the digital signal groups, y = K + 2 ~ (M / S), the processing unit converts the sensing unit group of the y-1th column in the row according to the S × T conversion units When sensing a signal group, the target detection digital signal converted by the detection conversion unit and the digital converted by the S × T conversion units corresponding to the sensing unit group of the y-th column in the row The digital signal corresponding to the target detection digital signal in the signal group, and the sensing unit group corresponding to the y-1th column in the row The second correction value of the digital signal group to obtain the second correction value of the digital signal group corresponding to the sensing unit group of the y-th column in the row, and according to the sensing corresponding to the y-column of the row The second correction value of the digital signal group of the unit group corrects each digital signal in the digital signal group of the sensing unit group corresponding to the y-th column in the row. The noise suppression method of the fingerprint collection device as described in claim 7, after step (C), further includes the following steps: (D) Repeat steps (A), (B) and (C) until the M / of each line The sensing signals of the sensing units of the S sensing unit groups have all been converted, and the digital signal groups corresponding to each row except the reference digital signal group have been corrected. A noise suppression method for a fingerprint collection device is implemented by a fingerprint collection device, which includes an M × N array sensing unit, an S × T array conversion unit, a detection conversion unit, and a processing unit, The sensing unit is connected to the S × T conversion units and the detection conversion unit, and the processing unit is electrically connected to the S × T conversion units and the detection conversion unit, and each sensing unit is used to generate a sum Sensing signal, where M is a multiple of S, N is a multiple of T, and M × N> S × T, the sensing units of the M × N array can be divided into (M / S) × (N / T) The sensing unit group of the array, each sensing unit group includes S × T sensing units, and the noise suppression method of the fingerprint collection device includes the following steps: (A) The processing unit controls the S × T units The conversion unit sequentially converts a sense generated by the S × T sensing units in each of the M / S sensing unit groups in one of the N / T rows to include an S × T pen sensing signal The test signal group is a digital signal group containing S × T digital signals, and the S × T conversion units are controlled by the processing unit to convert the first to (M / S) -1 At the same time as the sensing signal group of the sensing unit group of the, the processing unit also controls the detection conversion unit to convert the current conversion sensing unit group adjacent to the S × T conversion units being converted and is located in the A sensing signal generated by a sensing unit in the sensing unit group in a row above the currently converted sensing unit group is a digital detection signal; (B) Select the converted one corresponding to the row The digital signal group of the sensing unit group of the Kth row in the sensing unit group of the M / S row serves as a reference digital signal group, K

1 ~ (M / S); and (C) For each of the converted digital signal groups corresponding to the sensing unit group in the i-th column in the row, i = 1 ~ K-1, the processing The unit detects the digital signal converted by the detection conversion unit at least when the S × T conversion units convert the sensing signal group of the sensing unit group of the i + 1th column in the row, And the digital signal corresponding to the target detected digital signal in the digital signal group converted by the S × T conversion units corresponding to the sensing unit group in the i-th column of the row to obtain the corresponding digital signal corresponding to the target detected digital signal A first correction value of the digital signal group of the sensing unit group corresponding to the i-th column in the row, and according to the digital signal group of the sensing unit group corresponding to the i-th column in the row The first correction value corrects each digital signal in the converted digital signal group of the sensing unit group corresponding to the i-th column in the row, and for the converted digital signal corresponding to the j-th in the row Each of the digital signal groups of the sensing unit group of the row, j = K + 1 ~ (M / S), the processing unit converts the row at least according to the S × T conversion units The sensing signal group of the sensing unit group in the jth column, the target detection digital signal converted by the detection conversion unit, and the conversions of the S × T conversion units corresponding to the row In the digital signal group of the sensing unit group in the j-1th column, the digital signal corresponding to the target detection digital signal is obtained to obtain the converted sensing unit group corresponding to the jth column in the row A second correction value of the digital signal group of the digital signal group, and according to the second correction value of the digital signal group of the sensing unit group corresponding to the jth column in the row, correct the converted value corresponding to the row Each digital signal in the digital signal group of the sensing unit group in the jth column. The noise suppression method of the fingerprint collection device according to claim 10, wherein in step (C), for the converted sensing unit group corresponding to the K-1th column in the row, the processing The unit detects digital signals converted by the detection conversion unit according to the S × T conversion units when converting the sensing signal group of the sensing unit group of the Kth column in the row, and the The digital signal corresponding to the target detected digital signal in the digital signal group converted by the S × T conversion units corresponding to the sensing unit group in the K-1 column in the row is obtained corresponding to the converted digital signal The first correction value of the digital signal group corresponding to the sensing unit group in the K-1 column in the row, and according to the digital signal group corresponding to the sensing unit group in the K-1 column in the row The first correction value corrects each digital signal in the digital signal group of the sensing unit group corresponding to the K-1th column in the row. For the converted digital signal corresponding to the row in the row The sensing unit group of K + 1 column, the processing unit converts one of the rows in the row according to the S × T conversion units In the sensing signal group of the sensing unit group in the K + 1th column, the target detection digital signal converted by the detection conversion unit, and the conversions of the S × T conversion units corresponding to the row In the digital signal group of the sensing unit group in the Kth column in the digital signal corresponding to the target detection digital signal, the corresponding sensing unit corresponding to the converted K + 1 column in the row is obtained The second correction value of the digital signal group of the group, and correcting the second correction value corresponding to the row according to the second correction value of the digital signal group of the sensing unit group corresponding to the K + 1th column in the row Each digital signal in the digital signal group of the sensing unit group in the K + 1th column, and for each digital signal group in the converted digital signal group corresponding to the sensing unit group in the xth column in the row In other words, x = 1 ~ K-2, the processing unit detects the conversion when converting the sensing signal group of the sensing unit group in the x + 1th column of the row according to the S × T conversion units The target detection digital signal converted by the unit and the sensing unit corresponding to the xth column in the row converted by the S × T conversion units In the digital signal group of the group, the digital signal corresponding to the target detected digital signal and the first correction value of the digital signal group corresponding to the sensing unit group in the x + 1th column in the row are obtained corresponding to the The first correction value of the digital signal group of the sensing unit group in the xth column of the row, and the correction is based on the first correction value of the digital signal group corresponding to the sensing unit group of the xth column in the row Each digital signal in the converted digital signal group corresponding to the sensing unit group in the xth column of the row, and for the converted sensing unit group corresponding to the yth column in the row Each of the digital signal groups of the group, y = K + 2 ~ (M / S), the processing unit converts the sense of the sensing unit group of the y-th column in the row according to the S × T conversion units When measuring a signal group, the target detection digital signal converted by the detection conversion unit, the S × T conversion units converted corresponding to the sensing unit group of the y-1 column in the row The digital signal corresponding to the target detection digital signal in the digital signal group, and the sensing unit group corresponding to the y-1th column in the row The second correction value of the digital signal group of the digital signal group to obtain the second correction value of the digital signal group of the sensing unit group corresponding to the y-th column in the row, and according to the sense corresponding to the y-column of the row The second correction value of the digital signal group of the measuring unit group corrects each digital signal in the digital signal group of the sensing unit group corresponding to the y-th column in the row. The noise suppression method of the fingerprint collection device as described in claim 10, after step (C), further includes the following steps: (D) Repeat steps (A), (B) and (C) until the M / of each line The sensing signals of the sensing units of the S sensing unit groups have all been converted, and the digital signal groups corresponding to each row except the reference digital signal group have been corrected.