CN110991206B - Reflection type lens-free DPM imaging system - Google Patents
Reflection type lens-free DPM imaging system Download PDFInfo
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- CN110991206B CN110991206B CN201911317785.4A CN201911317785A CN110991206B CN 110991206 B CN110991206 B CN 110991206B CN 201911317785 A CN201911317785 A CN 201911317785A CN 110991206 B CN110991206 B CN 110991206B
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- led lamp
- dpm
- imaging system
- image sensor
- computer
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10712—Fixed beam scanning
- G06K7/10722—Photodetector array or CCD scanning
- G06K7/10732—Light sources
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10792—Special measures in relation to the object to be scanned
Abstract
According to the reflection type lens-free DPM imaging system provided by the embodiment of the invention, the light emission of the 4 LED lamps is controlled through the control instruction sent by the computer, so that the emitted light is reflected by the surface of a sample to be detected and then projected onto the image sensor, a two-dimensional code image is generated, the two-dimensional code image is converted into an electric signal through the image sensor, the corresponding image data is transmitted to the computer by the printed circuit board according to the electric signal, and finally the computer can reconstruct the image data to generate the DPM code with high resolution. By adopting the embodiment provided by the invention, the DPM code with higher resolution can be obtained, the reading problem of the DPM code on the ultra-small part is solved, and the imaging system is smaller and more portable without a lens, so that the cost is reduced.
Description
Technical Field
The invention relates to the technical field of DPM code imaging, in particular to a reflective lensless DPM imaging system.
Background
The DPM (Direct Part Mark) code is a special mark making technology, and the mark carrier such as paper and labels is not needed to directly make marks on the surfaces of the parts. The surface area of the common part is smaller, so DPM codes mostly adopt two-dimensional codes with large capacity and high density, and the codes are usually printed on the part directly by stippling, etching or code spraying. With the miniaturization of parts, the existing DPM imaging system has become increasingly unable to meet the requirement of high resolution. However, the current DPM imaging system is dependent on a lens imaging system, the imaging system images bar code information of DPM through a lens and an image sensing component, and the imaging quality of the optical imaging system brings higher requirements on the material selection and manufacturing process of the imaging lens, so that the current DPM imaging system has the characteristics of large volume, high cost and the like. The lens-free imaging technology is a front technology in the imaging field in recent years, has the main advantages that an imaging lens is not needed in an imaging system, an object is directly imaged and recorded through an image sensing device, and the core technology is that the object is illuminated by special structured light, and a high-definition image of the object is reconstructed through a special algorithm according to the physical rule of light wave transmission and related image information processing technology. However, most of the lens-free imaging is only applicable to imaging of transparent objects, so that the lens-free imaging cannot be applied to a DPM imaging recognition system.
Disclosure of Invention
The invention aims to provide a reflective lens-free DPM imaging system, the whole system does not need lenses, space is saved, cost is reduced, DPM codes with higher density can be read, the DPM codes can be applied to smaller products, and the application range of the DPM codes is enlarged.
In order to achieve the above purpose, the embodiment of the invention provides a reflection type lens-free DPM imaging system, which comprises a printed circuit board (2), a first LED lamp (4), a second LED lamp (5), a third LED lamp (14), a fourth LED lamp (15), a tested sample (10) and a computer (13);
the printed circuit board (2) is respectively connected with the first LED lamp (4), the second LED lamp (5), the third LED lamp (14) and the fourth LED lamp (15);
the computer (13) is connected with the USB interface (8) on the printed circuit board (2) through a USB data line (9);
the first LED lamp (4), the second LED lamp (5), the third LED lamp (14) and the fourth LED lamp (15) are controlled to emit light through control instructions sent by the computer (13), so that the emitted light is reflected by the surface of the tested sample (10) and then projected onto the image sensor (1) integrated by the printed circuit board (2) to generate a two-dimensional code image;
converting the two-dimensional code image into an electric signal by the image sensor (1), so that the printed circuit board (2) transmits corresponding image data to the computer (13) according to the electric signal;
the computer (13) performs reconstruction processing on the image data to generate a high-resolution DPM code.
Further, the control instructions comprise a first control instruction and a second control instruction;
the first control instruction is used for controlling the first LED lamp (4) and the second LED lamp (5) to emit light, and the third LED lamp (14) and the fourth LED lamp (15) to emit no light;
the second control instruction is used for controlling the first LED lamp (4) and the second LED lamp (5) to emit no light, and the third LED lamp (14) and the fourth LED lamp (15) to emit light.
Further, according to the first control instruction and the second control instruction, the computer (13) receives two pieces of image data sent by the printed circuit board (2), and the computer (13) carries out reconstruction processing on the two pieces of image data to generate a DPM code with high resolution.
Further, the first LED lamp (4), the second LED lamp (5), the third LED lamp (14) and the fourth LED lamp (15) are respectively arranged on four sides of the inner wall of the first shell (6).
Further, the half intensity angle range of the first LED lamp (4), the second LED lamp (5), the third LED lamp (14) and the fourth LED lamp (15) is 30-60 degrees.
Further, the included angles (A) formed by the LED luminous central axes of the first LED lamp (4), the second LED lamp (5), the third LED lamp (14) and the fourth LED lamp (15) and the central axis (11) perpendicular to the photosensitive surface of the image sensor are respectively 30-75 degrees.
Further, the reflective lensless DPM imaging system further comprises a highly transparent mirror (3);
the high transparent lens (3) is arranged between the tested sample (10) and the image sensor (1) so as to protect the image sensor (1).
Further, the transmittance of the high-transparency lens (3) is more than 80%.
Further, the distance (L) from the light sensing surface of the image sensor (1) to the surface of the sample (10) to be measured is in the range of 1.7 mm to 10 mm.
Further, the first shell (6) and the second shell (7) are connected to form a square protection shell with a lower opening.
Compared with the prior art, the method has the following beneficial effects:
according to the reflection type lens-free DPM imaging system provided by the embodiment of the invention, the light emission of the 4 LED lamps is controlled through the control instruction sent by the computer, so that the emitted light is reflected by the surface of a sample to be detected and then projected onto the image sensor, a two-dimensional code image is generated, the two-dimensional code image is converted into an electric signal through the image sensor, the corresponding image data is transmitted to the computer by the printed circuit board according to the electric signal, and finally the computer can reconstruct the image data to generate the DPM code with high resolution. By adopting the embodiment provided by the invention, the DPM code with higher resolution can be obtained, the reading problem of the DPM code on the ultra-small part is solved, and the imaging system is smaller and more portable without a lens, so that the cost is reduced.
Drawings
FIG. 1 is a cross-sectional view of one embodiment of a reflective lensless DPM imaging system provided by the invention;
FIG. 2 is a bottom view of another embodiment of a reflective lensless DPM imaging system provided by the invention;
FIG. 3 is a flow diagram of one embodiment of a reflective lensless DPM imaging system provided by the invention;
wherein, the reference numerals in the specification and the drawings are as follows:
1. an image sensor; 2. a printed circuit board; 3. a high transparency lens; 4. a first LED lamp; 5. a second LED lamp; 14. a third LED lamp; 15. a fourth LED lamp; 6. a first housing; 7. a second housing; 8. a USB interface; 9. a USB data line; 10. a sample to be tested; 11. a central axis perpendicular to a photosensitive surface of the image sensor; 12. an LED luminous central shaft; 13. a computer; A. the included angle between the LED luminous central axis and the central axis perpendicular to the photosensitive surface of the image sensor; l, distance from photosensitive surface of image sensor to surface of sample to be measured.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 and 2, an embodiment of the present invention provides a reflection type lens-free DPM imaging system, which includes a printed circuit board (2), a first LED lamp (4), a second LED lamp (5), a third LED lamp (14), a fourth LED lamp (15), a sample to be tested (10), and a computer (13);
the printed circuit board (2) is respectively connected with the first LED lamp (4), the second LED lamp (5), the third LED lamp (14) and the fourth LED lamp (15);
the computer (13) is connected with the USB interface (8) on the printed circuit board (2) through a USB data line (9);
the first LED lamp (4), the second LED lamp (5), the third LED lamp (14) and the fourth LED lamp (15) are controlled to emit light through control instructions sent by the computer (13), so that the emitted light is reflected by the surface of the tested sample (10) and then projected onto the image sensor (1) integrated by the printed circuit board (2) to generate a two-dimensional code image; converting the two-dimensional code image into an electric signal by the image sensor (1), so that the printed circuit board (2) transmits corresponding image data to the computer (13) according to the electric signal; the computer (13) performs reconstruction processing on the image data to generate a high-resolution DPM code.
As a preferred embodiment of the present invention, the control instruction includes a first control instruction and a second control instruction; the first control instruction is used for controlling the first LED lamp (4) and the second LED lamp (5) to emit light, and the third LED lamp (14) and the fourth LED lamp (15) to emit no light; the second control instruction is used for controlling the first LED lamp (4) and the second LED lamp (5) to emit no light, and the third LED lamp (14) and the fourth LED lamp (15) to emit light.
According to the first control instruction and the second control instruction, a computer (13) receives two pieces of image data sent by the printed circuit board (2), and the computer (13) carries out reconstruction processing on the two pieces of image data to generate a DPM code with high resolution.
With continued reference to fig. 1 and 2, the first LED lamp (4), the second LED lamp (5), the third LED lamp (14) and the fourth LED lamp (15) are respectively disposed on four sides of the inner wall of the first housing (6), and the half-intensity angle range of each LED lamp is 30 ° to 60 °.
Preferably, the included angles (a) formed by the LED luminous central axes of the first LED lamp (4), the second LED lamp (5), the third LED lamp (14) and the fourth LED lamp (15) and the central axis (11) perpendicular to the photosensitive surface of the image sensor are respectively 30-75 degrees.
The light reflected by the surface of the tested sample is projected onto the photosensitive surface of the image sensor to obtain different images by adopting the light emitting cooperation of 4 LEDs at different positions, and then the high-resolution DPM code is reconstructed, so that the whole system does not need a lens, the space is saved, the cost is reduced, the resolution of 20 micrometers is high, the DPM code with smaller density can be read, the DPM code can be applied to smaller products, and the application range of the DPM code is enlarged.
As another preferred embodiment of the present invention, the present invention provides a reflective lensless DPM imaging system, further comprising a highly transparent lens (3); the high-transparency lens (3) is arranged between the tested sample (10) and the image sensor (1), the light transmittance of the high-transparency lens (3) is more than 80%, and when the reflected light of the tested sample (10) is projected onto the light sensitive surface of the image sensor (1) through the high-transparency lens (3), the image sensor (1) can be protected.
Preferably, the distance (L) from the light sensing surface of the image sensor (1) to the surface of the sample (10) to be measured is in the range of 1.7 mm to 10 mm.
As shown in fig. 1-2, the first shell (6) and the second shell (7) are connected to form a square protection shell with a lower opening.
Referring to fig. 3, in order to better illustrate the working principle of the DPM imaging system provided by the present invention, the following is a procedure of imaging by the DPM imaging system provided by the present invention:
firstly, a computer sends an instruction to control the LED lamps (4) and (5) to emit light, the LED lamps (14) and (15) to emit no light, the light emitted by the LED lamps is reflected by the surface of a tested sample (10) and then projected onto an image sensor (1) through a high-transparency lens (3), the image sensor (1) converts a two-dimensional image into an electric signal, and the image data is transmitted to a computer (13) through a USB interface (8) and a USB wire (9) after the data interaction with a microprocessor on a printed circuit board (2);
then, the computer sends instructions to control the LED lamps (14) and (15) to emit light, the LED lamps (4) and (5) do not emit light, the emitted light of the LEDs is reflected by the surface of the tested sample (10) and then projected onto the image sensor (1) through the high-transparency lens (3), the image sensor (1) converts a two-dimensional image into an electric signal, and the image data is transmitted to the computer (13) through the USB interface (8) and the USB wire (9) after the data interaction with the microprocessor on the printed circuit board (2);
finally, the computer (13) carries out reconstruction processing on the images acquired twice to obtain a DPM code with high resolution, and then decodes the DPM code.
In summary, the invention adopts 4 LEDs at different positions to emit light to cooperate, the light reflected by the surface of the sample to be measured is projected onto the photosensitive surface of the image sensor to obtain different images, and then the DPM code with high resolution is reconstructed, so that the whole system does not need lenses, the space is saved, the cost is reduced, the resolution of 20 micrometers is achieved, the DPM code with smaller density and higher density can be read, the DPM code can be applied to smaller products, and the application range of the DPM code is enlarged.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (8)
1. The reflection type lensless DPM imaging system is characterized by comprising a printed circuit board (2), a first LED lamp (4), a second LED lamp (5), a third LED lamp (14), a fourth LED lamp (15), a tested sample (10) and a computer (13);
the printed circuit board (2) is respectively connected with the first LED lamp (4), the second LED lamp (5), the third LED lamp (14) and the fourth LED lamp (15);
the computer (13) is connected with the USB interface (8) on the printed circuit board (2) through a USB data line (9);
the first LED lamp (4), the second LED lamp (5), the third LED lamp (14) and the fourth LED lamp (15) are controlled to emit light through control instructions sent by the computer (13), so that the emitted light is reflected by the surface of the tested sample (10) and then projected onto the image sensor (1) integrated by the printed circuit board (2), and a two-dimensional code image is generated, wherein the control instructions comprise a first control instruction and a second control instruction; the first control instruction is used for controlling the first LED lamp (4) and the second LED lamp (5) to emit light, and the third LED lamp (14) and the fourth LED lamp (15) to emit no light; the second control instruction is used for controlling the first LED lamp (4) and the second LED lamp (5) to emit no light, and the third LED lamp (14) and the fourth LED lamp (15) to emit light; the generating the two-dimensional code image includes: generating a first two-dimensional code image according to the first control instruction, and generating a second two-dimensional code image according to the second control instruction;
converting the first two-dimensional code image and the second two-dimensional code image into electric signals through the image sensor (1), so that the printed circuit board (2) transmits corresponding image data to the computer (13) according to the electric signals;
and according to the first control instruction and the second control instruction, enabling a computer (13) to receive two pieces of image data sent by the printed circuit board (2), and carrying out reconstruction processing on the two pieces of image data through the computer (13) to generate a DPM code with high resolution.
2. The reflection type lens-free DPM imaging system according to claim 1, characterized in that the first LED lamp (4), the second LED lamp (5), the third LED lamp (14) and the fourth LED lamp (15) are respectively arranged on four sides of the inner wall of the first housing (6) of the image sensor (1) integrated by the printed circuit board (2), wherein the first LED lamp (4), the second LED lamp (5), the third LED lamp (14), the fourth LED lamp (15) and the third LED lamp (14) are fixed.
3. The reflective lensless DPM imaging system of claim 2, wherein the half intensity angle of the first LED lamp (4), the second LED lamp (5), the third LED lamp (14), the fourth LED lamp (15) is in the range of 30 ° to 60 °.
4. A reflective lens-free DPM imaging system as claimed in claim 3, characterized in that the LED emission central axes of the first LED lamp (4), the second LED lamp (5), the third LED lamp (14), the fourth LED lamp (15) respectively form an angle (a) with the central axis (11) perpendicular to the photosurface of the image sensor in the range of 30 ° to 75 °.
5. A reflectorized lensless DPM imaging system as in claim 1, further comprising a highly transparent lens (3);
the high transparent lens (3) is arranged between the tested sample (10) and the image sensor (1) so as to protect the image sensor (1).
6. A reflective lensless DPM imaging system according to claim 5, characterized in that the transmittance of said highly transparent mirror (3) is greater than 80%.
7. A reflectorized lensless DPM imaging system as in claim 1, characterized in that the distance (L) of the photosurface of the image sensor (1) to the surface of the sample (10) under test is in the range of 1.7 mm to 10 mm.
8. The reflection type lens-free DPM imaging system according to claim 1, characterized in that a first housing (6) of the image sensor (1) integrated by the printed circuit board (2) and a second housing (7) of the sample (10) to be tested are connected to form a square protective housing with a lower opening, wherein the first LED lamp (4), the second LED lamp (5), the third LED lamp (14), the fourth LED lamp (15) and the first housing are fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911317785.4A CN110991206B (en) | 2019-12-19 | 2019-12-19 | Reflection type lens-free DPM imaging system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911317785.4A CN110991206B (en) | 2019-12-19 | 2019-12-19 | Reflection type lens-free DPM imaging system |
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| CN110991206A CN110991206A (en) | 2020-04-10 |
| CN110991206B true CN110991206B (en) | 2023-09-19 |
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| US10509931B1 (en) * | 2018-07-03 | 2019-12-17 | Hand Held Products, Inc. | Methods, systems, and apparatuses for scanning and decoding direct part marking indicia |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9033237B1 (en) * | 2013-10-26 | 2015-05-19 | Symbol Technologies, Inc. | Decoding DPM indicia with polarized illumination |
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2019
- 2019-12-19 CN CN201911317785.4A patent/CN110991206B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105022980A (en) * | 2015-07-28 | 2015-11-04 | 福建新大陆电脑股份有限公司 | Barcode image identifying and reading device |
| CN205121579U (en) * | 2015-07-28 | 2016-03-30 | 福建新大陆电脑股份有限公司 | Bar code image recognition equipment |
| CN105844197A (en) * | 2016-04-05 | 2016-08-10 | 广东旭龙物联科技股份有限公司 | Double lens image collecting and processing device used for DPM code reader |
| EP3309706A1 (en) * | 2016-10-12 | 2018-04-18 | Hand Held Products, Inc. | Mobile imaging barcode scanner |
| US10509931B1 (en) * | 2018-07-03 | 2019-12-17 | Hand Held Products, Inc. | Methods, systems, and apparatuses for scanning and decoding direct part marking indicia |
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