TWI612002B - A method for scanning - Google Patents

Abstract

The invention discloses an image scanning method. The image scanning method comprises the following steps: Step 1: detecting whether there is paper in the paper tray, performing step 2 in the paper tray, and ending the process without paper in the paper tray Prompt error; Step 2, separate paper and feed paper; Step 3, detect if paper has touched the paper feed sensor, if yes, go to step 4. Otherwise, end the process and prompt an error; Step 4, scan and detect the image If there is any abnormality in the paper feeding edge, step 5 is performed if there is no abnormality, otherwise the process ends and an error is indicated; in step 5, the paper is continuously scanned completely, and steps 1 to 4 are repeated until the paper tray is detected. If there is no paper inside, the process ends and the prompt is completed.

Description

Image scanning method

The present invention relates to an image scanning method, and more particularly to an image scanning method capable of preventing damage of a paper to be scanned when the paper to be scanned is abnormal.

According to a conventional scanning device, a paper separating mechanism, a paper feeding sensing member, a paper feeding mechanism, a photosensitive member, and a controller are included. During the paper scanning process, the paper advances first by separating the paper by the separating mechanism. Then, the paper feeding mechanism drives the paper forward to feed, and at the same time, the controller controls the photosensitive element to perform image scanning. After the scanning is completed, Continue scanning the next piece of paper.

However, because some scanned documents are stapled or the paper placed is folded, the user does not notice when placing the document. Scanning the two types of paper will cause the front end of the paper folded or stapled to be staggered when entering the separation mechanism. If the paper feeding mechanism drives the paper to continue feeding forward, the paper may be damaged.

Therefore, it is necessary to provide an image scanning method capable of preventing the paper to be scanned from being damaged when the paper to be scanned is abnormal.

SUMMARY OF THE INVENTION The object of the present invention is to provide an image scanning method capable of preventing breakage of a sheet to be scanned when the paper to be scanned is abnormal, in view of the above-described conventional deficiencies.

In order to achieve the above object, the present invention provides a method for image scanning, which is applied to a scanning device including a paper tray and a paper feed sensor, comprising the following steps: Step 1, detecting whether there is a paper tray Paper, if there is paper in the paper tray, go to step 2. If there is no paper in the paper tray, the process will end and the error will be indicated; in step 2, the paper will be fed and paper will be fed; in step 3, it will be detected if there is paper touch the paper sensor. If yes, go to step 4. Otherwise, end the process and prompt an error; in step 4, scan and detect whether the paper feed edge in the image is abnormal. If there is no abnormality, go to step 5. Otherwise, end the process and prompt an error; step 5 Continue to scan the paper in full and repeat steps 1 through 4 until the paper is detected that there is no paper in the paper tray to end the process and prompt completion.

In order to achieve the above object, the present invention provides a scanning apparatus suitable for the image scanning method as described above for scanning a sheet of paper, including a paper tray, a controller, a memory, a driving device, and a first sense. a measuring device, a paper separating mechanism, a paper feeding mechanism, a paper feeding sensor and an image sensor. The paper tray is for holding the paper to be scanned; the memory is connected with the controller; the driving device is controlled by the controller; the first sensor is controlled by the controller to sense whether the paper tray has paper; the paper separating mechanism is The driving device is driven to separate the plurality of sheets to be scanned; the paper feeding mechanism is driven by the driving device to feed the paper separated by the separating mechanism forward; the paper feeding sensor is controlled by the controller for sensing The paper feeding mechanism feeds in the incoming paper and transmits the signal to the controller; the image sensor is controlled by the controller to scan the paper and detect whether the paper feeding edge in the scanned partial image is abnormal and the complete scanning is abnormal. Paper.

In summary, the image scanning method of the present invention scans and detects whether there is an abnormality in the feeding edge of the image by the image sensor, and continues the scanning process without abnormality, otherwise the process ends and an error is indicated, thereby avoiding the paper to be scanned. If the abnormality continues to feed forward, the paper is damaged.

100‧‧‧ scanning device

10‧‧‧ Controller

20‧‧ ‧ paper tray

30‧‧‧First sensor

40‧‧‧ memory

50‧‧‧ drive

60‧‧‧Separator

70‧‧‧Feeding mechanism

80‧‧‧Feed sensor

90‧‧‧Image sensor

91‧‧‧First paper

92‧‧‧First Staples

93‧‧‧Second paper

94‧‧‧second staple

95‧‧‧ Third paper

96‧‧‧fourth paper

The first figure is a schematic structural view of a scanning device used in the image scanning method of the present invention.

The second figure is a schematic flow chart of the image scanning method of the present invention.

The third figure is a schematic diagram of a first staple in the upper left corner of a plurality of sheets scanned by the image scanning method of the present invention.

The fourth figure is a schematic diagram of a second staple in the upper right corner of the plurality of sheets scanned by the image scanning method of the present invention.

The fifth drawing is a schematic view of the paper scanned by the image scanning method of the present invention as a folded paper.

The sixth drawing is a schematic diagram of a plurality of sheets scanned by the image scanning method of the present invention as a normal paper feed.

In order to explain the technical content, structural features, objectives and effects of the present invention in detail, the following detailed description is given by way of example.

Referring to the first figure, the scanning device 100 of the present invention comprises a controller 10, a paper tray 20, a first sensor 30, a memory 40, a driving device 50, a paper separating mechanism 60, and a paper feeding mechanism. 70. A paper feed sensor 80 and an image sensor 90. The paper tray 10 is configured to hold paper to be scanned, and the first sensor 30 is configured to sense whether there is paper in the paper tray 20, and the memory 40 is connected to the controller 10, and the driving device is 50 is controlled by the controller 10, and the paper separating mechanism 60 is driven by the driving device 50 to separate the plurality of sheets to be scanned in the paper tray 20, and the paper feeding mechanism 70 is driven by the driving device 50 to separate the paper separating mechanism 60 separated paper is fed forward, and the paper feeding sensor 80 is used to sense feeding by the paper feeding mechanism 70 The incoming paper and the signal are transmitted to the controller 10, and the image sensor 90 is controlled by the controller 10 to scan the paper and detect whether the paper feed edge in the scanned partial image is abnormal and the complete scan is abnormal. Paper.

Referring to the first and second figures, the image scanning method of the present invention comprises the following steps: Step 1. After the scanning device 100 is turned on, the controller 10 controls the first sensor 30 to detect whether the paper tray 10 has paper. If there is paper in the paper tray 10, step 2 is performed. If the paper tray 10 has no paper, the process ends and an error is indicated. In step 2, the paper is fed and fed. Specifically, the controller 10 controls the driving device 50, and the driving device 50 drives the driving device 50. The paper mechanism 60 separates the plurality of sheets to be scanned in the paper tray 20, and the control driving device 50 drives the paper feeding mechanism 70 to feed the paper separated by the paper separating mechanism 60 forward; step 3, defines a preset time After the preset time, it is detected whether the paper fed by the paper feeding mechanism 70 touches the paper feeding sensor 80, and if yes, step 4 is performed; otherwise, the process ends and an error is indicated; in step 4, the image sensor 90 scans and detects If there is any abnormality in the paper feeding edge in the image, step 5 is performed if there is no abnormality, otherwise the process ends and an error is indicated; in step 5, the paper is continuously scanned completely, and steps 1 to 4 are repeated until the detection is detected. There is no paper in the tray 10 Beams and prompts to complete the process.

Referring to the second figure, the resolution of the scanning device 100 used in this embodiment is 300 DPI (Dot Per Inch), wherein the step 4 scans and detects whether the paper feeding edge in the image is abnormal. First, a predetermined distance is scanned first. In the embodiment, the preset distance is half an inch, that is, 12.7 mm, and the scanned image on the preset distance is detected in the vertical axis direction of the paper feeding. Preferably, in the present embodiment, the vertical axis of the paper feed 150 rows are detected at an equal interval, and a plurality of columns are detected in the horizontal direction of the paper feed. Preferably, in the embodiment, 9 columns of data are detected in the horizontal direction of the paper feed, and 9 columns are detected. The distance between the data intervals is the same; second, find the non-background point, that is, the coordinates of the paper feed edge, and third, define a slope preset contrast value, and calculate whether the slope of the paper feed edge in the scanned image is within the range of the slope preset contrast value. , the scanning is continued within the range of the slope preset contrast value, and the scanning process is ended and the error is not indicated within the range of the slope preset contrast value. Preferably, it checks the slope of the paper feeding edge of the scanned image to preset the contrast value. 0.1051, the slope of the paper edge is less than or equal to 0.1051 degrees, and the scanning continues. The slope of the paper edge is greater than 0.1051, the scanning process ends and an error is indicated.

In this embodiment, finding the non-background point, that is, the coordinates of the paper feed edge, adopts the following method: First, determining the color value of the background color. In this embodiment, we assume that the color value of the background color is (Rb, Gb, Bb); Then, define three color difference preset contrast values, and the background color color values (Rb, Gb, Bb) are respectively subtracted from the detected color values of the points. In this embodiment, we assume that the detected values are detected. The color values of the points (Ra, Ga, Ba) are respectively detected if the absolute values of Rb-Ra, Gb-Ga, and Bb-Ba are respectively less than or equal to a corresponding color difference preset value. The point is the background point. If at least one of the absolute values of Rb-Ra, Gb-Ga, and Bb-Ba is greater than the corresponding preset value of the color difference, it means that the non-background point is detected, that is, the paper is found, preferably Ground, the absolute values of the absolute values of Rb-Ra, Gb-Ga, and Bb-Ba are respectively 20 for the color difference.

Referring to the first figure and the third figure, in the embodiment, a plurality of first staples 92 are nailed to the upper left corner of the paper to be scanned, and the paper separating mechanism 60 separates the uppermost paper, that is, the first paper 91. The paper feed mechanism 70 drives forward feed, and the image sensor 90 scans a half inch in the longitudinal direction of the paper feed and detects 150 lines of the scanned image, and detects 9 columns of data in the horizontal direction of the paper feed. When the non-background points are detected, P1 to P9 are the nine columns of data detected by the image sensor 90 on the horizontal axis of the scanned image, and their abscissas are (280, 530, 780, respectively). 1030, 1280, 1530, 1780, 2030, 2280), the units of 9 columns of data on the abscissa are all pixels, and the value of P1 on the ordinate is 150. The image sensor is detected on the vertical axis of the 280-pixel abscissa. In the 150 lines, no non-background points were found, that is, no paper was found. Similarly, P2 indicates that the value of the ordinate is 150, indicating that the image sensor has detected no more than 150 lines on the vertical axis of the 530-pixel abscissa. The point of the background is that no paper is found. The value of P3 on the ordinate is 140. When the image sensor 90 detects 140 lines in the direction of the vertical axis of 780 pixels on the abscissa, it finds the non-background point and finds the paper. When the paper is found. After that, it is no longer looking down, so the value is locked at 140, and so on, and the coordinate values of P4 to P9 are derived accordingly. In this embodiment, to obtain the inclination angle of the paper feed edge of the first paper 91, the first point of the first paper 91, that is, the point P7 (1780, 21) and the vertical axis are detected in the longitudinal direction. The second point P6 (1530, 52) of the first paper 91 is detected in the direction. In this embodiment, the slope of the paper feed edge of the first paper 91 is 0.124 {31/250 or 12. 7mm × (31 / 150) / [(250 × 25.4) mm / 300]}, which is greater than 0.1051, so this embodiment scans the preset 150 lines, the paper feeding mechanism 70 will stop, avoid paper Continue feeding forward to cause paper breakage.

Referring to the first figure and the fourth figure, in the embodiment, a plurality of second staples 94 are nailed to the upper right corner of the paper to be scanned, and the paper separating mechanism 60 separates the uppermost paper, that is, the second paper 92. After being fed forward by the paper feeding mechanism 70, the image sensor 90 scans a half inch in the longitudinal direction of the paper feeding and detects 150 lines of the scanned image, and detects 9 columns of data in the horizontal axis direction of the paper feeding. The image sensor 90 detects that each coordinate data of P1 to P9 is (280, 150), (5) 30, 30), (780, 62), (1030, 98), (1280, 131), (1530, 150), (1780, 150), (2030, 150), (2280, 150), this embodiment In order to obtain the inclination angle of the paper feed edge of the second paper 93, the first point of the second paper 93, that is, the point P2 (530, 30) and the vertical axis direction are detected in the longitudinal direction. The second point P3 (780, 62) of the second paper 93 is detected. In this embodiment, the slope of the paper feed edge of the second paper 93 is 0.128 (32/250), which is greater than 0. .1051, so in this embodiment, after the preset 150 lines are scanned, the paper feeding mechanism 70 is stopped to prevent the paper from continuing to feed forward and the second paper 93 is broken.

Referring to the first figure and the fifth figure, the paper to be scanned in this embodiment is a folded paper. In this embodiment, when the paper separating mechanism 60 is adjacent to the paper separation mechanism 60 of the third paper 95. The half-page paper is fed forward by the paper feeding mechanism 70, and the image sensor 90 detects that the vertical axis of the paper is scanned by half an inch and detects 150 lines of the scanned image, on the horizontal axis of the paper feeding. The direction detection 9 columns of data, the image sensor 90 detects the coordinate data of P1 to P9 as (280, 150), (530, 150), (780, 150), (1030, 150), (1280, 128), (1530, 92), (1780, 59), (2030, 25), (2280, 150). In this embodiment, the inclination angle of the paper feed edge of the third paper 95 is to be obtained. The first point P8 (2030, 25) in which the third sheet 95 is detected in the axial direction and the second point P7 (1780, 59) in which the third sheet 95 is detected in the longitudinal direction are calculated. In this embodiment, the slope of the paper feed edge of the third paper 95 is 0.136 (42/250), which is greater than 0.1051, so in the present embodiment, the preset 150 lines are scanned, and the paper feeding mechanism 70 Will stop and stop In the line, the third paper 95 is prevented from continuing to feed forward, causing the third paper 95 to be broken.

Referring to the first and sixth figures, in the embodiment, the paper to be scanned is a paper that is normally fed. In this embodiment, when the paper separating mechanism 60 separates the fourth paper 96 from the paper tray 20. The paper feed mechanism 70 drives forward feed, and the image sensor 90 scans a half inch in the longitudinal direction of the paper feed and detects 150 lines of the scanned image, and detects 9 columns of data in the horizontal direction of the paper feed. The image sensor 90 detects that the coordinate data of P1 to P9 are (280, 71), (530, 61), (780, 53), (1030, 48), (1280, 39), (1530, 21). ), (1780, 12), (2030, 150), (2280, 150). In this embodiment, the inclination angle of the paper feed edge of the fourth paper 96 is obtained, and the first direction is detected in the vertical axis direction. The first point of the four sheets 96, point P7 (1780, 12), and the second point P6 (1530, 21) of the fourth sheet 96 detected in the direction of the longitudinal axis are calculated, the fourth sheet of this embodiment The slope of the paper edge of 96 is 0.036 (9/250), which is less than 0.1051. Therefore, after the preset 150 lines are scanned in this embodiment, the paper feeding mechanism 70 will not stop, and the paper will continue to feed forward. scanning.

In summary, the image scanning method of the present invention scans and detects whether there is an abnormality in the paper feeding edge of the image by the image sensor 90, and continues the scanning process without abnormality, otherwise the process ends and an error is indicated, thereby avoiding the paper to be scanned. If there is an abnormality, continue feeding forward to cause damage to the paper.

100‧‧‧ scanning device

10‧‧‧ Controller

20‧‧ ‧ paper tray

30‧‧‧First sensor

40‧‧‧ memory

50‧‧‧ drive

60‧‧‧Separator

70‧‧‧Feeding mechanism

80‧‧‧Feed sensor

90‧‧‧Image sensor

Claims (7)

An image scanning method is applied to a scanning device, which comprises a paper tray and a paper feeding sensor, comprising the following steps: Step 1, detecting whether there is paper in the paper tray, and paper in the paper tray Perform step 2, if there is no paper in the paper tray, the process ends and an error is indicated; in step 2, the paper is separated and the paper is fed; in step 3, it is detected whether there is paper touching the paper feed sensor, and if yes, step 4 is performed, otherwise the process ends. The process prompts an error; in step 4, scans and detects whether the paper feed edge in the image is abnormal. If there is no abnormality, step 5 is performed; otherwise, the process ends and an error is indicated; the scan detects the paper feed edge in the image. Whether there is an abnormality, the following steps are taken as follows: First, a predetermined distance is scanned first, and a plurality of rows are detected in the longitudinal direction of the paper feeding direction, and a plurality of columns are detected in the horizontal axis direction of the paper feeding. Second, find the non-background point, that is, the coordinates of the paper feed edge; third, define a slope preset contrast value, calculate whether the slope of the paper feed edge in the scanned image is within the slope preset contrast value, and the slope preset Within the range of contrast values Then continue scanning, not ending the scanning process within the range of the slope preset comparison value and prompting the error; Step 5, continue to scan the paper completely, and repeat steps 1 to 4 until no paper is detected in the paper tray Then the process ends and the prompt is completed. For example, the image scanning method described in claim 1 finds the non-background point, that is, the coordinates of the paper feeding edge, and adopts the following steps: First, the color value of the background color is determined. Here, we assume the color of the background color. The value is (Rb, Gb, Bb); then, the three color difference preset contrast values are defined, and the color values of the background color (Rb, Gb, Bb) are respectively subtracted from the detected color values of the points, and here we assume The detected color values of the points (Ra, Ga, Ba), respectively, if the absolute values of Rb-Ra, Gb-Ga, and Bb-Ba are respectively less than a corresponding color difference preset value, then the detected The measured point is the background point. If at least one of the absolute values of Rb-Ra, Gb-Ga and Bb-Ba is greater than the corresponding preset value of the color difference, it means that the non-background point is detected and the paper is found. . The image scanning method of claim 2, wherein the absolute values of the Rb-Ra, Gb-Ga, and Bb-Ba respectively have a preset difference value of 20 for each color difference. The image scanning method according to claim 1, which scans and detects 150 lines of data in the longitudinal direction of the paper feed. The image scanning method according to claim 1, wherein the data is detected in nine columns in the horizontal direction of the paper feed. The image scanning method of claim 5, wherein the distance between the nine columns of data intervals detected by the horizontal axis direction is the same. The image scanning method according to claim 1, wherein the slope of the paper feeding edge of the scanned image is preset to be 0.1051, and the slope of the paper feeding edge is less than or equal to 0.1051, and the scanning is continued. A slope greater than 0.1051 ends the scanning process and prompts an error.