CN1674625A - An image scanning device with positioning lines designed on the cover - Google Patents

Abstract

The invention provides an image scanning device with a positioning line designed on a cover plate. The image scanning device comprises a scanning window and an optical scanning module. The scanning window is used for placing an object to be scanned, and the optical scanning module is used for scanning the object to be scanned. The cover plate faces the scanning window and has a plurality of positioning lines on a lower surface. The lower surface has a predetermined pattern, and the colors of the positioning lines and the predetermined pattern have a contrast value of a predetermined degree. Therefore, when the optical scanning module scans the object to be scanned, the position coordinates and the size of the preset pattern can be obtained through the positioning lines in the cover plate, and when the preset pattern is regarded as one part of the object to be scanned by the image scanning device, the preset pattern can be deleted from the image obtained by analysis.

Description

An image scanning device with positioning lines designed on the cover

technical field

The present invention relates to a cover plate applied to an image scanning device, in particular to a cover plate on which positioning lines are made to correctly locate the position of a predetermined pattern on the cover plate, further enabling the image scanning device to exclude False reflection patterns belonging to the object to be scanned.

technical background

Please refer to FIG. 1 , which is a schematic diagram of a conventional image scanning device 10 . A conventional image scanning device 10 at least includes a scanning window 11 , a cover plate 12 , and an optical scanning module 13 . The scanning window 11 is made of a transparent material, and is mainly used to carry an object to be scanned for image scanning by the optical scanning module. The cover plate 12 is used to cover the scanning window 11, and provides a scanning background of a fixed color, so that when the optical scanning module 13 scans the object to be scanned, the light generated by the optical scanning module 13 can be reflected, and the principle of color contrast can be utilized. Locate the position of the object to be scanned on the scanning window 12 .

In the conventional technology, since the cover plate only provides a fixed background color, if the color of the object to be scanned happens to be the same or similar to the background color provided by the cover plate, the image scanning device will not be able to identify the boundary of the object to be scanned . For example, if the background color of the cover plate is white, when a document to be scanned with white background color is placed, the image scanning device will consider the entire cover plate as the boundary of the object to be scanned, causing the object to be scanned True boundary misidentification. In order to solve this problem, conventional technology utilizes software tuning to make up for the lack of obvious borders. However, in practical applications, deviations are unavoidable. In addition to the method of software adjustment, another conventional solution is to install a variable light source in the image scanning device, so as to use light of different chromaticities to scan objects to be scanned of different colors. However, in this method, the optical scanning module in the image scanning device needs to be modified, and the corresponding hardware configuration also needs to be changed. In this way, the complexity of manufacturing the overall image scanning device is increased, and the cost is also increased.

In addition, in Taiwan Patent Publication No. 534554, a cover plate capable of changing backgrounds of different colors is proposed. This conventional technology can select and use a relatively obvious cover plate according to the color of the object to be scanned, so the positioning of the object to be scanned is definitely improved. In addition, after the image scanning device determines the boundary of the object to be scanned, it can further adjust the object to be scanned that is accidentally placed skewed in the image processing, so that the scanned image is no longer skewed. However, since the color of the object to be scanned cannot be predicted, multiple sets of cover plates must be prepared for emergencies. And when multiple groups of objects to be scanned with different colors must be scanned at one time, the background color of the cover plate must be constantly changed. As a result, the use of the image scanning device is quite inconvenient.

In order to solve the above problems, Taiwan Patent Application No. 93106688 proposes a cover plate design with a predetermined pattern, so that the image scanning device can accurately locate the object to be scanned by using predetermined patterns of different contrasting colors on the cover plate. boundary. However, the cover plate with the predetermined pattern may cause the light generated by the optical scanning module to directly pass through the object to be scanned and be reflected by the predetermined pattern because the object to be scanned is too thin or easily penetrates light. Therefore, the optical scanning module will receive wrong reflection signals, and subsequent image processing will produce wrong images. This phenomenon is called reverse scene. In view of the deficiencies in the use of various conventional technologies, it is necessary to propose a cover plate design that can effectively locate the object to be scanned and the pattern on the cover plate.

Contents of the invention

The purpose of the present invention is to provide a cover plate applied to an image scanning device, which can accurately locate a predetermined pattern on the cover plate, thereby making up for the lack of the reverse scene phenomenon easily caused by the cover plate with the predetermined pattern.

The invention is an image scanning device, which includes a cover plate, a casing and an optical scanning module. The cover plate has a plurality of positioning lines on the lower surface. The lower surface has a predetermined pattern, and the positioning lines have a color. The color and the predetermined pattern have a predetermined degree of contrast. The casing is located under the cover plate and is engaged with the cover plate by a joint mechanism. The casing has a scanning window for placing an object to be scanned, and the scanning window faces the lower surface. The optical scanning module is located in the casing and is used for image scanning the document to be scanned on the scanning window.

With the cover plate with the predetermined pattern of the present invention, the position coordinates of the object to be scanned and the pattern on the cover plate can be accurately positioned by using a plurality of positioning lines. Even if the image scanning device analyzes an erroneous image, since the size and position of the predetermined pattern have been located by the positioning lines, the image scanning device can delete the predetermined pattern from the analyzed image by using this information.

Description of drawings

FIG. 1 is a schematic diagram of a conventional image scanning device.

FIG. 2 is a schematic diagram of an image scanning device and an object to be scanned applying the present invention.

FIG. 3 is a schematic diagram of signal waveforms generated when the optical scanning module in FIG. 2 scans the cover.

FIG. 4 is a schematic diagram of the document to be scanned and the predetermined pattern in FIG. 2 .

FIG. 5 is a schematic diagram of signal waveforms generated by the optical scanning module scanning the object to be scanned in FIG. 2 .

FIG. 6 is a schematic diagram of a feed-in image scanning device of the present invention.

Description of figure number

20, 30: Image scanning device 201: Cover plate

202: Shell 203: Optical scanning module

204: Driver module 205: Guide module

206: Control circuit 2012: Lower surface

2014: Scheduled drawings

2016, 2017, 2018: positioning line 2021: joint mechanism

2022: Scan window 2052: Scan path

32: Opening 34: Exit

36: Stepping motor 37: Entrance storage board

38: Export shelf

Detailed ways

The first specific embodiment of the present invention will be described in detail below. Please refer to FIG. 2 . FIG. 2 is a schematic diagram of an image scanning device 20 and an object 22 to be scanned according to the present invention. The image scanning device 20 applying the present invention includes a cover 201 , a casing 202 , an optical scanning module 203 , a driving module 204 , a guiding module 205 and a control circuit 206 . The cover plate 201 has a lower surface 2012 on which a predetermined pattern 2014 and a plurality of positioning lines 2016, 2017, 2018 are formed. In this specific embodiment, the predetermined pattern 2014 is composed of black squares and gray squares to achieve the purpose of positioning the object to be scanned, and the positioning lines 2016, 2017, 2018 are white straight lines with a fixed distance between them. And traverse the lower surface 2012. The predetermined pattern 2014 and the positioning lines 2016 , 2017 , 2018 can be produced by various methods. In this embodiment, the coating method is directly applied to the lower surface 2012 of the cover plate 201 .

As shown in FIG. 2 , in this specific embodiment, the predetermined pattern 2014 is a checkerboard pattern, and the positioning line is across the lower surface 2012 . However, in other embodiments, the positioning line can also be designed to cross the lower surface straightly or obliquely. The positioning line is mainly used to locate the position of the predetermined pattern, so it can further be changed according to the design of various patterns, as long as the position and size of the image can be effectively positioned, it is within the scope of the present invention.

The casing 202 is located under the cover plate 201 and engaged with the cover plate 201 by an engaging mechanism 2021 . The casing 202 has a scanning window 2022 for placing the object 22 to be scanned for image scanning by the optical scanning module 203 . In this specific embodiment, the engaging mechanism 2021 is a link structure, so that the cover 201 can be attached to the casing 202 or lifted off from the casing 202 freely. The cover plate 201 and the casing 202 can be made of plasticized materials such as ABS, while the scanning window 2022 needs to be made of transparent materials.

After the cover plate 201 is attached to the scanning window 2022, the optical scanning module 203 can start to perform image scanning. When the optical scanning module 203 is scanning, the driving module 204 drives the optical scanning module 203 , and the guiding module 205 guides the optical scanning module 203 to move along a scanning path 2052 . Both the optical scanning module 203 and the driving module 204 are controlled by the control circuit 206 . In this specific embodiment, the driving module 204 is completed with a stepping motor as the main body and a plurality of gear sets. The guide module 205 plans two left and right rows of grooves in the casing 202, so that the optical scanning module 203 can move according to a predetermined route without deviation, preventing scanning errors from occurring.

To sum up the above, when the optical scanning module 203 starts to scan the object 22 to be scanned, it generates light and scans the object 22 to be scanned sequentially. The light is reflected back into the optical scanning module 203 after passing through the object 22 to be scanned or the cover plate 201, and then senses the reflected light through each pixel in the image sensing element (not shown in the figure) contained in the optical scanning module 203 to construct a The scanned image of the object to be scanned. Please refer to FIG. 3 . FIG. 3 is a schematic diagram of signal waveforms generated when the optical scanning module 203 in FIG. 2 scans the cover 201 . In Figure 3, the vertical axis is the pixel value (Pixel Value), and the horizontal axis is the window position. When the optical scanning module 203 only scans the cover plate 201, that is, directly scans the predetermined pattern 2014, since the predetermined pattern 2014 is arranged in a checkerboard pattern, the waveform obtained by scanning each pixel in the optical scanning module will be as shown in Figure 3, Gray at the peaks, black at the troughs, and white positioning lines at the pulses. Therefore, with the appearance of the peak value and the previously known distance between the positioning lines, subsequent image processing components can clearly know the position of the predetermined pattern in the two positioning lines.

Then explain why the present invention can clearly locate when scanning the object to be scanned. Please refer to FIG. 4 and FIG. 5 . FIG. 4 is a schematic diagram of the document to be scanned 22 and the predetermined pattern 2014 in FIG. 2 , and FIG. 5 is a schematic diagram of signal waveforms generated by the optical scanning module 203 in FIG. When the object 22 to be scanned is placed on the scanning window, it is as shown in FIG. 4 when viewed from the scanning window. After the application of the present invention, regardless of any misplacement of the object 22 to be scanned (such as the positions B and C in FIG. 4 ), the present invention can correctly correspond to the boundary of the object to be scanned. If the color of the object to be scanned is similar to that of the pattern (position B in Figure 4), the image scanning device will regard the gray square connected to the object to be scanned as a part of the object to be scanned. Therefore, it must be located by the positioning line The location and size of all patterns have eliminated this error message.

In Figure 5, the vertical axis is the pixel value (Pixel Value), and the horizontal axis is the window position. When the optical scanning module 203 scans, the signal waveform when the object 22 to be scanned has not been scanned should be as shown in Figure 3, but when the object 22 to be scanned is scanned, because the color of the object to be scanned is different, the signal waveform will have ups and downs. At this time, the image scanning device 20 can determine the original image of the object to be scanned according to the change. However, if the object to be scanned is too thin or easily penetrates light, some of the obtained graphics will be the same as the waveform in Figure 3 (such as the reverse area in Figure 5), but since the image scanning device has already judged this The area belongs to a part of the object to be scanned, therefore, the final output image of the conventional technology will have a part of the predetermined pattern. After applying the present invention, since the positioning lines have a fixed distance, the size and orientation of each pattern can be obtained by the number of patterns located between the two positioning lines. Therefore, the subsequent image processing can combine the scanned image with the predetermined The patterns are compared and the repeated parts are processed.

This step of dealing with the reverse scene can also be performed during scanning. As long as the scanning area is jointly positioned by the positioning line, the position scanned by the current optical scanning module can be obtained, and then the coordinates and size of the pattern positioned by the positioning line can be integrated to obtain the current optical scanning module. The signal belongs to the pattern or the object to be scanned, and then the wrong signal is successfully eliminated.

To sum up, the present invention can effectively eliminate inadvertently generated erroneous signals, eliminate sensing signals that do not belong to the object to be scanned, and finally generate correct scanning images.

In addition to being applicable to the above-mentioned platform image scanning device (the cover can be tilted freely), the cover of the present invention can also be applied to a feed-in image scanning device. Please refer to FIG. 6 . FIG. 6 is a schematic diagram of a feed-in image scanning device 30 of the present invention. The difference between the second embodiment of the present invention and the first embodiment lies in the change in the engagement mechanism 2021 . In the second embodiment, the joint mechanism is to joint the cover plate 201 with the four sides of the scanning window and reserve a placement space and an opening 32 to facilitate the object to be scanned to enter the image scanning device 30 . As shown in FIG. 6 , the feed-in image scanning device 30 generally includes an opening 32 , an outlet 34 , a stepping motor 36 , an entrance storage plate 37 and an exit storage plate 38 . When the feed-in image scanning device 30 is activated, the object to be scanned placed on the entrance storage plate 38 can be brought into the storage space in the opening 32 by the stepping motor 36 . Afterwards, the image scanning device starts to perform image scanning on the object to be scanned. Since the components required for scanning are the same as those in the first embodiment, details are not repeated here. After being scanned, the object to be scanned is driven by the stepping motor 36 to leave the image scanning device 30 through the exit 34 and onto the exit shelf 38 .

It can be clearly understood from the above description that the emphasis of the present invention lies in the design of the positioning lines on the cover. That is, the positioning line compared with the predetermined pattern to a certain extent is enough to distinguish the size and position of the predetermined pattern after being scanned by the optical scanning module, and then correctly locate the boundary of the object to be scanned and analyze the difference between the pattern and the object to be scanned, so that the image The scanning device can analyze the correct scanning image.

Through the above detailed description of the preferred embodiments, it is hoped that the characteristics and spirit of the present invention can be described more clearly, and the scope of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, the intention is to cover various changes and equivalent arrangements within the scope of the claimed patent scope of the present invention.

Claims (19)

1. An image scanning device, characterized in that it comprises: A cover plate, the cover plate is made on the lower surface with a plurality of positioning lines, the lower surface has a predetermined pattern, these positioning lines have a predetermined color, and the predetermined color has a predetermined degree of contrast with the predetermined pattern; A housing, located under the cover plate, is engaged with the cover plate by an engaging mechanism, the housing has a scanning window for placing an object to be scanned, and the scanning window faces the predetermined pattern on the lower surface ;as well as An optical scanning module is located in the housing and used for image scanning of the document to be scanned on the scanning window. 2. The image scanning device as claimed in claim 1, further comprising a driving module, which is located in the housing and used to drive the optical scanning module to move. 3. The image scanning device as claimed in claim 1, further comprising a guiding module, located in the casing, for guiding the optical scanning module to move along a scanning path. 4. The image scanning device as claimed in claim 1, further comprising a control circuit located in the housing for controlling the optical scanning module. 5. The image scanning device as claimed in claim 1, wherein the engaging mechanism is a connecting rod for the cover to be selectively attached to the casing or lifted off from the casing. 6. The image scanning device as claimed in claim 1, characterized in that: the bonding mechanism is to attach the cover plate to the casing, and reserve an opening for the object to be scanned to enter and place it on the scanning on the window. 7. The image scanning device as claimed in claim 1, wherein there is a predetermined interval between every two positioning lines among the positioning lines. 8. A cover plate used in an image scanning device, the image scanning device includes a scanning window and an optical scanning module, the scanning window is used to place an object to be scanned, and the optical scanning module is used to scan the object to be scanned The scanning object is characterized in that: the cover plate is facing the scanning window, and a plurality of positioning lines are made on the lower surface, the lower surface has a predetermined pattern, these positioning lines have a color, the color and the predetermined pattern have A contrast value of a predetermined degree. 9. The cover plate used in an image scanning device as claimed in claim 8, wherein there is a predetermined interval between every two positioning lines among the positioning lines. 10. A platform image scanning device, characterized by comprising: A cover plate, the cover plate is made on the lower surface with a plurality of positioning lines, the lower surface has a predetermined pattern, these positioning lines have a predetermined color, and the predetermined color has a predetermined degree of contrast with the predetermined pattern; A housing, located under the cover plate, is engaged with the cover plate by a connecting rod, so that the cover plate can be selectively attached to the housing or lifted from the housing. The housing has a scanning a window for placing an object to be scanned, the scanning window is facing the special pattern on the lower surface; and An optical scanning module is located in the housing and used for image scanning of the document to be scanned on the scanning window. 11. The flat-bed image scanning device as claimed in claim 10, further comprising a driving module, which is located in the casing and used to drive the optical scanning module to move. 12 . The flatbed image scanning device as claimed in claim 10 , further comprising a guiding module, located in the casing, for guiding the optical scanning module to move along a scanning path. 13. The platform image scanning device as claimed in claim 10, further comprising a control circuit located in the housing for controlling the optical scanning module. 14. The flatbed image scanning device as claimed in claim 10, characterized in that every two positioning lines among the positioning lines are separated by a predetermined interval. 15. A feed-in image scanning device, characterized by comprising: A cover plate, the cover plate is made on the lower surface with a plurality of positioning lines, the lower surface has a predetermined pattern, these positioning lines have a predetermined color, and the predetermined color has a predetermined degree of contrast with the predetermined pattern; A casing is located under the cover, the casing and the cover are interlocked, and an opening is reserved for the object to be scanned to enter and be placed on the scanning window, the casing has a scanning a window for placing an object to be scanned, the scanning window is facing the special pattern on the lower surface; and An optical scanning module is located in the housing and used for image scanning of the document to be scanned on the scanning window. 16. The feed-in image scanning device as claimed in claim 15, further comprising a driving module, which is located in the casing and used to drive the optical scanning module to move. 17. The feed-in image scanning device as claimed in claim 15, further comprising a guiding module, located in the casing, for guiding the optical scanning module to move along a scanning path. 18. The feed-in image scanning device as claimed in claim 15, further comprising a control circuit located in the housing for controlling the optical scanning module. 19. The feed-in image scanning device as claimed in claim 15, characterized in that every two positioning lines among the positioning lines are separated by a predetermined interval.

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