CN113984094B - Decoding method, device, medium and product of absolute value encoder - Google Patents
Decoding method, device, medium and product of absolute value encoder Download PDFInfo
- Publication number
- CN113984094B CN113984094B CN202111050204.2A CN202111050204A CN113984094B CN 113984094 B CN113984094 B CN 113984094B CN 202111050204 A CN202111050204 A CN 202111050204A CN 113984094 B CN113984094 B CN 113984094B
- Authority
- CN
- China
- Prior art keywords
- pixel
- code
- absolute value
- pixel information
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000009499 grossing Methods 0.000 claims description 18
- 238000004590 computer program Methods 0.000 claims description 9
- 239000011295 pitch Substances 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 8
- 230000007547 defect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/182—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a pixel
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
Abstract
The invention relates to the field of absolute value code disks, and discloses a decoding method of an absolute value encoder, which comprises the steps of outputting a first driving signal for driving an LED light source and a second driving signal for controlling a CCD; receiving pixel information acquired by a CCD on an absolute value encoder, wherein the pixel information is pixel patterns formed by light and dark stripes of a code wheel, which are acquired by the CCD and are irradiated on the absolute value encoder by an LED light source; determining a position code corresponding to the pixel information according to the code corresponding to each stripe in the pixel information, and determining a coarse angle of a measuring shaft connected with the code wheel according to the position code; calculating the average value of the distances between the center positions of a plurality of stripes in the pixel information and the centers of preset pixels corresponding to the CCD as a fine value; and carrying out correction treatment on the coarse angle according to the fine value to obtain the precise angle of the measuring shaft. The invention improves the accuracy of the output angle of the absolute value code disc, thereby meeting the high-precision measurement requirements of different external measurement devices.
Description
Technical Field
The present invention relates to the field of absolute value coders, and in particular, to a decoding method, apparatus, medium, and product of an absolute value encoder.
Background
Due to the increasing development of the current industry, people have great requirements on the precision of the code wheel, and the accurate value of the position obtained in real time is very important. In the prior art, pixel information acquired by a CCD is directly decoded, and an angle value obtained by decoding is used as a final angle value to be output. The current absolute value encoder is mostly used for precision measurement equipment, and is required to output a relatively accurate angle value, for example, when an office uses the absolute value encoder in a total station, the total station is a standard angle measurement instrument, so that the total station has very high requirements on the angle accuracy, the more accurate the corresponding value of the angle is, the more accurate the angle at the decoding position of the absolute value encoder is required, and the measurement result of the total station can be influenced.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the purposes of the invention is to provide a decoding method of an absolute value encoder, which can solve the problems that in the prior art, pixel information acquired by a CCD is directly decoded, and an angle value obtained by decoding is used as a final angle value to be output, and the decoding precision and the frame rate of the existing absolute value code disc are severely limited, so that the high-precision and high-frame rate output can not be ensured.
The second object of the present invention is to provide an electronic device, which can solve the problem that in the prior art, the pixel information collected by the CCD is directly decoded, and the angle value obtained by decoding is used as the final angle value to be output, and the decoding precision and the frame rate of the existing absolute value code disc are severely limited, so that the high-precision and high-frame rate output can not be ensured.
The third objective of the present invention is to provide a computer readable storage medium, which can solve the problem that in the prior art, the pixel information collected by the CCD is directly decoded, and the decoded angle value is used as the final angle value to be output, and the decoding precision and the frame rate of the existing absolute value code disc are severely limited, so that the high precision and the high frame rate output cannot be ensured.
The fourth object of the present invention is to provide a computer program product, which can solve the problem that in the prior art, the pixel information collected by the CCD is directly decoded, and the angle value obtained by decoding is used as the final angle value to be output, and the decoding precision and the frame rate of the existing absolute value code disc are severely limited, so that the high precision and the high frame rate output cannot be ensured.
One of the purposes of the invention is realized by adopting the following technical scheme:
a decoding method of an absolute value encoder, the absolute value encoder being connected to an FPGA, the method being performed by the FPGA, comprising the steps of:
outputting a driving signal, and outputting a first driving signal for driving the LED light source in the absolute value encoder and a second driving signal for controlling the CCD on the absolute value encoder;
receiving pixel information, namely receiving the pixel information acquired by a CCD on an absolute value encoder, wherein the pixel information is acquired by the CCD and is formed by light and dark stripes of a code wheel irradiated on the absolute value encoder by an LED light source;
coarse code decoding, namely determining a position code corresponding to the pixel information according to the code corresponding to each stripe in the pixel information, and determining a coarse angle of a measuring shaft connected with a code disc according to the position code;
fine code decoding, namely calculating an average value of distances between the center positions of a plurality of stripes in the pixel information and the center of a preset pixel corresponding to the CCD, and taking the average value as a fine value;
and integrating the coarse and fine codes, and rectifying the coarse angle according to the subdivision value to obtain the accurate angle of the measuring shaft.
Further, before calculating the average value of the distance between the center position of each stripe in the pixel information and the center of the corresponding preset pixel of the CCD, the method further includes: and performing first smoothing on the pixel information according to a preset pixel clock, and performing second smoothing on the pixel information subjected to the first smoothing according to a preset main clock.
Further, the pixel information includes a plurality of stripes, each stripe exists in the form of a pixel pattern, each pixel pattern has a unique arrangement sequence number, each stripe corresponds to a unique gray value, a first smooth sliding window width is determined according to a preset pixel clock, an average value of gray values corresponding to the pixel patterns in the first smooth sliding window with continuous arrangement sequence numbers is calculated and used as a first average value, and the first average value is used as a first gray value of the pixel pattern with the first arrangement sequence number until the first gray value corresponding to each pixel pattern is calculated.
Further, the second smoothing process specifically includes: and determining the width of the sliding window of the second smoothing according to a preset master clock, calculating the average value of the first gray values corresponding to the pixel patterns in the sliding window of the second smoothing with continuous arrangement sequence numbers, taking the average value as the second average value, taking the second average value as the second gray value of the pixel pattern with the first arrangement sequence number, and calculating the second gray value corresponding to each pixel pattern.
Further, the calculating the average value of the distances between the center positions of a plurality of stripes in the pixel information and the center of the preset pixel corresponding to the CCD specifically includes: and calculating an average value of the distance between the center position of the pixel pattern with the second gray value exceeding the preset gray value threshold value and the center of the corresponding preset pixel of the CCD in the pixel information and taking the average value as a fraction value.
Further, the pitches of the center positions of the different adjacent two pixel patterns are the same.
Further, the position coding comprises 21 codes, the pixel information is a pixel pattern formed by a plurality of stripes, and the coarse code decoding specifically comprises: and sequentially screening out the stripes at the two ends of the central position of the pixel pattern until 21 stripes are screened out, recording the code of each stripe, forming a position code by the codes of the screened stripes, and determining the coarse angle of a measuring shaft connected with the code disc according to the position code.
The second purpose of the invention is realized by adopting the following technical scheme:
an electronic device, comprising: a processor;
a memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising instructions for performing a decoding method of an absolute value encoder as described herein.
The third purpose of the invention is realized by adopting the following technical scheme:
a computer-readable storage medium having stored thereon a computer program for execution by a processor of a decoding method of an absolute value encoder as described herein.
The fourth technical scheme adopted by the invention is as follows:
a computer program product comprising a computer program which, when executed by a processor, implements a method of decoding an absolute value encoder as described herein.
Compared with the prior art, the invention has the beneficial effects that: according to the decoding method of the absolute value encoder, the driving of the LED light source and the CCD in the absolute value encoder is achieved through the FPGA, the pixel information collected by the CCD is subjected to coarse code decoding and fine code decoding respectively, and finally the coarse angle obtained through the coarse code decoding is subjected to deviation correcting according to the subdivision value obtained through the fine code decoding, so that the accurate angle of the measuring shaft is obtained, the accuracy of the output angle of the absolute value code disc is improved, and therefore the high-accuracy measurement requirements of different external measuring devices are met.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings. Specific embodiments of the present invention are given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is a flow chart of a decoding method of an absolute value encoder according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.
As shown in fig. 1, a decoding method of an absolute value encoder in the present application, where the absolute value encoder is connected to an FPGA, FPGA (Field Programmable Gate Array) is a product further developed on the basis of programmable devices such as PAL, GAL, and the like. The programmable device is used as a semi-custom circuit in the field of Application Specific Integrated Circuits (ASICs), which not only solves the defect of custom circuits, but also overcomes the defect of limited gate circuits of the original programmable device. The decoding method is executed by the FPGA and specifically comprises the following steps of:
the driving signal is output, and the first driving signal for driving the LED light source in the absolute value encoder and the second driving signal for controlling the CCD (CCD refers to a charge coupled device, which is a detecting element for representing the signal size by using the electric charge quantity and transmitting the signal by using a coupling mode) are output. In this embodiment, the first driving signal is used to control the on-off of the LED light source to control the exposure time of the CCD, and the second driving signal is used to trigger the CCD to perform its own power-on initialization.
And receiving pixel information, namely receiving the pixel information acquired by the CCD on the absolute value encoder, wherein the pixel information is pixel patterns formed by light and dark stripes of a code wheel, which are acquired by the CCD and are irradiated on the absolute value encoder by an LED light source.
And decoding the rough code, determining a position code corresponding to the pixel information according to the code corresponding to each stripe in the pixel information, and determining the rough angle of a measuring shaft connected with the code disc according to the position code. In this embodiment, the position code includes 21 codes, the pixel information is a pixel pattern formed by a plurality of stripes, each code is 0 or 1, that is, each stripe corresponds to a code of 0 or 1, the stripes may be arranged in sequence, and the code of each position in the position code is determined according to the arrangement sequence of the stripes, so as to form a character string formed by 21 codes. The coarse code decoding specifically comprises the following steps: and sequentially screening out the stripes at the two ends of the central position of the pixel pattern until 21 stripes are screened out, recording the code of each stripe, forming a position code by the codes of the screened stripes, and determining the coarse angle of a measuring shaft connected with the code disc according to the position code. In this embodiment, each position code corresponds to a unique coarse angle, and a comparison table having a one-to-one mapping relationship between the coarse angle and the position code may be preset, so that the corresponding coarse angle may be determined according to the position code.
And performing first smoothing on the pixel information according to a preset pixel clock, and performing second smoothing on the pixel information subjected to the first smoothing according to a preset main clock. In this embodiment, the pixel information includes a plurality of stripes, each stripe exists in the form of a pixel pattern, each pixel pattern has a unique arrangement sequence number, each stripe corresponds to a unique gray value, a first smooth sliding window width is determined according to a preset pixel clock, an average value of gray values corresponding to pixel patterns in the first smooth sliding window with continuous arrangement sequence numbers is calculated and used as a first average value, and the first average value is used as a first gray value of the pixel pattern with the first arrangement sequence number until the first gray value corresponding to each pixel pattern is calculated. The second smoothing process specifically includes: and determining the width of the sliding window of the second smoothing according to a preset master clock, calculating the average value of the first gray values corresponding to the pixel patterns in the sliding window of the second smoothing with continuous arrangement sequence numbers, taking the average value as the second average value, taking the second average value as the second gray value of the pixel pattern with the first arrangement sequence number, and calculating the second gray value corresponding to each pixel pattern.
And decoding the fine code, calculating the average value of the distances between the center positions of a plurality of stripes in the pixel information and the center of a preset pixel corresponding to the CCD, and taking the average value as the fine value. The method comprises the following steps: and calculating an average value of the distance between the center position of the pixel pattern with the second gray value exceeding the preset gray value threshold value and the center of the corresponding preset pixel of the CCD in the pixel information and taking the average value as a fraction value. In the present embodiment, the pitches of the center positions of the different adjacent two pixel patterns are the same.
And integrating the coarse and fine codes, and rectifying the coarse angle according to the subdivision value to obtain the accurate angle of the measuring shaft in the external equipment. The external device in this embodiment may be a precision measurement instrument such as a total station.
The present invention also provides an electronic device including: a processor;
a memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising instructions for performing a decoding method of an absolute value encoder as described herein.
The present invention also provides a computer-readable storage medium having stored thereon a computer program that is executed by a processor to perform a decoding method of an absolute value encoder as described herein.
The invention also provides a computer program product comprising a computer program which, when executed by a processor, implements a decoding method of an absolute value encoder as described in the present application.
According to the decoding method of the absolute value encoder, the driving of the LED light source and the CCD in the absolute value encoder is achieved through the FPGA, the pixel information collected by the CCD is subjected to coarse code decoding and fine code decoding respectively, and finally the coarse angle obtained through the coarse code decoding is subjected to deviation correcting according to the subdivision value obtained through the fine code decoding, so that the accurate angle of the measuring shaft is obtained, the accuracy of the output angle of the absolute value code disc is improved, and therefore the high-accuracy measurement requirements of different external measuring devices are met.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; those skilled in the art can smoothly practice the invention as shown in the drawings and described above; however, those skilled in the art will appreciate that many modifications, adaptations, and variations of the present invention are possible in light of the above teachings without departing from the scope of the invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the present invention.
Claims (6)
1. A decoding method of an absolute value encoder, the absolute value encoder being connected to an FPGA, characterized in that: the method is executed by the FPGA and comprises the following steps:
outputting a driving signal, and outputting a first driving signal for driving the LED light source in the absolute value encoder and a second driving signal for controlling the CCD on the absolute value encoder;
receiving pixel information, namely receiving the pixel information acquired by a CCD on an absolute value encoder, wherein the pixel information is a pixel pattern which is acquired by the CCD and formed by light and dark stripes of a code wheel irradiated on the absolute value encoder by an LED light source;
coarse code decoding, namely determining a position code corresponding to the pixel information according to the code corresponding to each stripe in the pixel information, and determining a coarse angle of a measuring shaft connected with a code disc according to the position code;
fine code decoding, namely calculating an average value of distances between the center positions of a plurality of stripes in the pixel information and the center of a preset pixel corresponding to the CCD, and taking the average value as a fine value;
integrating the coarse and fine codes, and performing deviation correction treatment on the coarse angle according to the subdivision value to obtain the accurate angle of the measuring shaft;
before calculating the average value of the distance between the center position of each stripe in the pixel information and the center of the corresponding preset pixel of the CCD, the method further comprises the following steps: performing first smoothing on the pixel information according to a preset pixel clock, and performing second smoothing on the pixel information subjected to the first smoothing according to a preset main clock;
the pixel information comprises a plurality of stripes, each stripe exists in the form of pixel patterns, each pixel pattern is provided with a unique arrangement sequence number, each stripe corresponds to a unique gray value, the width of a sliding window which is smoothed for the first time is determined according to a preset pixel clock, the average value of the gray values corresponding to the pixel patterns in the sliding window which is smoothed for the first time and is continuous in arrangement sequence number is calculated and used as a first average value, and the first average value is used as the first gray value of the pixel pattern with the first arrangement sequence number until the first gray value corresponding to each pixel pattern is calculated;
wherein, the second smoothing process specifically comprises: and determining the width of the sliding window of the second smoothing according to a preset master clock, calculating the average value of the first gray values corresponding to the pixel patterns in the sliding window of the second smoothing with continuous arrangement sequence numbers, taking the average value as the second average value, taking the second average value as the second gray value of the pixel pattern with the first arrangement sequence number, and calculating the second gray value corresponding to each pixel pattern.
2. A decoding method of an absolute value encoder according to claim 1, characterized in that: the average value of the distances between the center positions of a plurality of stripes in the pixel information and the center of a preset pixel corresponding to the CCD is calculated specifically as follows: and calculating an average value of the distance between the center position of the pixel pattern with the second gray value exceeding the preset gray value threshold value and the center of the corresponding preset pixel of the CCD in the pixel information and taking the average value as a fraction value.
3. A decoding method of an absolute value encoder according to claim 1, characterized in that: the pitches of the center positions of the different adjacent two pixel patterns are the same.
4. A decoding method of an absolute value encoder according to claim 1, characterized in that: the position coding comprises 21 codes, the pixel information is a pixel pattern formed by a plurality of stripes, and the coarse code decoding specifically comprises: and sequentially screening out the stripes at the two ends of the central position of the pixel pattern until 21 stripes are screened out, recording the code of each stripe, forming a position code by the codes of the screened stripes, and determining the coarse angle of a measuring shaft connected with the code disc according to the position code.
5. An electronic device, comprising: a processor;
a memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising means for performing a decoding method of an absolute value encoder according to any of claims 1-4.
6. A computer-readable storage medium having stored thereon a computer program, characterized by: the computer program is executed by a processor to perform a decoding method of an absolute value encoder according to any one of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111050204.2A CN113984094B (en) | 2021-09-08 | 2021-09-08 | Decoding method, device, medium and product of absolute value encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111050204.2A CN113984094B (en) | 2021-09-08 | 2021-09-08 | Decoding method, device, medium and product of absolute value encoder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113984094A CN113984094A (en) | 2022-01-28 |
| CN113984094B true CN113984094B (en) | 2024-01-09 |
Family
ID=79735455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111050204.2A Active CN113984094B (en) | 2021-09-08 | 2021-09-08 | Decoding method, device, medium and product of absolute value encoder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113984094B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116164645B (en) * | 2023-02-20 | 2023-08-08 | 浙江禾川科技股份有限公司 | Absolute position detection method, device, equipment and storage medium |
| CN116858134B (en) * | 2023-07-07 | 2023-12-05 | 北京控制工程研究所 | High-precision photoelectric angular displacement sensor position resolving method and device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63187118A (en) * | 1987-01-30 | 1988-08-02 | Sony Corp | Position reading encoder |
| EP2113748A2 (en) * | 2008-05-01 | 2009-11-04 | Mitutoyo Corporation | Absolute position length measurement type encoder |
| CN102322882A (en) * | 2011-06-02 | 2012-01-18 | 浙江大学 | Absolute shaft angle encoding system based on array detector |
| JP2015137955A (en) * | 2014-01-23 | 2015-07-30 | 三菱電機株式会社 | absolute encoder |
| CN106017520A (en) * | 2016-06-21 | 2016-10-12 | 广东工业大学 | Absolute optical encoder encoding method and encoder for implementing same |
| CN109238176A (en) * | 2018-09-14 | 2019-01-18 | 中国科学院长春光学精密机械与物理研究所 | A kind of angle displacement measuring device and its measurement method |
| CN110006366A (en) * | 2019-03-25 | 2019-07-12 | 中国科学院长春光学精密机械与物理研究所 | A kind of angle displacement measuring device that image is reflective and its method |
| CN112985475A (en) * | 2021-05-06 | 2021-06-18 | 南京百花光电有限公司 | Photoelectric encoder and photoelectric conversion algorithm thereof |
-
2021
- 2021-09-08 CN CN202111050204.2A patent/CN113984094B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63187118A (en) * | 1987-01-30 | 1988-08-02 | Sony Corp | Position reading encoder |
| EP2113748A2 (en) * | 2008-05-01 | 2009-11-04 | Mitutoyo Corporation | Absolute position length measurement type encoder |
| CN102322882A (en) * | 2011-06-02 | 2012-01-18 | 浙江大学 | Absolute shaft angle encoding system based on array detector |
| JP2015137955A (en) * | 2014-01-23 | 2015-07-30 | 三菱電機株式会社 | absolute encoder |
| CN106017520A (en) * | 2016-06-21 | 2016-10-12 | 广东工业大学 | Absolute optical encoder encoding method and encoder for implementing same |
| CN109238176A (en) * | 2018-09-14 | 2019-01-18 | 中国科学院长春光学精密机械与物理研究所 | A kind of angle displacement measuring device and its measurement method |
| CN110006366A (en) * | 2019-03-25 | 2019-07-12 | 中国科学院长春光学精密机械与物理研究所 | A kind of angle displacement measuring device that image is reflective and its method |
| CN112985475A (en) * | 2021-05-06 | 2021-06-18 | 南京百花光电有限公司 | Photoelectric encoder and photoelectric conversion algorithm thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113984094A (en) | 2022-01-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113984094B (en) | Decoding method, device, medium and product of absolute value encoder | |
| CN110726425B (en) | Image type decoding method of single-ring absolute type photoelectric code disc | |
| CN109238176B (en) | Angular displacement measuring device and measuring method thereof | |
| CN103759749A (en) | Single-code-channel absolute position encoder | |
| CN105890634B (en) | A kind of absolute type encoder and its decoding measuring method | |
| CN106482669B (en) | A kind of angle displacement measurement system using twin-line array image detector | |
| CN110006366B (en) | Image reflection type angular displacement measuring device and method thereof | |
| JP2006226987A (en) | Photoelectric encoder and scale therefor | |
| CN1613187A (en) | Encoder self-calibration apparatus and method | |
| US20210398307A1 (en) | Absolute position detection | |
| CN104296968A (en) | Modulation transfer function test method of multichannel CCD | |
| CN104019834A (en) | Single code channel absolute position coding method and reading measuring system | |
| CN105674893B (en) | Absolute grating scale based on cmos image sensor and its measurement method | |
| CN108801257B (en) | Positioning method for indoor automatic parking | |
| CN1223826C (en) | Image measuring system and method | |
| CN102506718A (en) | Accurate displacement measurement device with real scales | |
| CN107764296A (en) | Absolute position code and its reading device | |
| CN104930977A (en) | Displacement measurement method and system thereof | |
| CN114608633B (en) | Single code channel absolute type displacement measurement coding code disc and system | |
| CN114279356B (en) | Gray scale fringe pattern design method for three-dimensional measurement | |
| CN113591875B (en) | High-precision pointer type instrument identification method | |
| CN109740402B (en) | Two-dimensional code direction and position obtaining method based on frequency spectrum information | |
| CN107424164B (en) | A kind of Image Edge-Detection Accuracy Assessment | |
| CN111121637A (en) | Grating displacement detection method based on pixel coding | |
| JPH07198331A (en) | Method for reading meter by image processing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |