CN113660392A - 3D endoscope high-definition video acquisition and transmission system and method - Google Patents
3D endoscope high-definition video acquisition and transmission system and method Download PDFInfo
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- CN113660392A CN113660392A CN202110769228.7A CN202110769228A CN113660392A CN 113660392 A CN113660392 A CN 113660392A CN 202110769228 A CN202110769228 A CN 202110769228A CN 113660392 A CN113660392 A CN 113660392A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/555—Constructional details for picking-up images in sites, inaccessible due to their dimensions or hazardous conditions, e.g. endoscopes or borescopes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
- H04N25/76—Addressed sensors, e.g. MOS or CMOS sensors
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- H—ELECTRICITY
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- H04N5/00—Details of television systems
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- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
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Abstract
The utility model discloses a 3D endoscope high definition video acquisition transmission system, which comprises a lens, a control box and a video receiving end; the lens comprises two paths of CMOS image sensors and a serial PHY chip and is used for collecting video data, and the collected video data are output to the serial PHY chip through an M IP I interface; the control box is connected with the lens through a double-shaft cable and comprises two paths of M IP I interfaces and a deserializing PHY chip; serial video data in the serial PHY chip are transmitted to the control box through a dual-axis cable; the control box is connected with the video receiving end through an FPD-Li nk I serial bus, a deserializing PHY chip realizes data deserializing, and deserialized videos are output to the video receiving end through two paths of M I I interfaces respectively; the method solves the problems of poor transmission reliability, large circuit size, difficult miniaturization and high cost in video image remote transmission in endoscope application in the prior art.
Description
Technical Field
The disclosure belongs to the technical field of endoscope video acquisition, and particularly relates to a 3D endoscope high-definition video acquisition and transmission system and method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Thanks to the development of electronics and digital video technology, the electronic endoscope appears in the 80 s of the 20 th century, so that the image is not transmitted by optical fibers any more, but is replaced by a photosensitive integrated circuit camera system, the displayed image has high quality, high brightness and large image, finer lesions can be detected, the outer diameter of the electronic endoscope is thinner, the image is clearer and more intuitive, and the operation is convenient; some endoscopes, and even micro integrated circuit sensors, feed observed information back to the computer; it not only can obtain the diagnosis information of tissue organ morphology, but also can measure various physiological functions of tissue organ.
The electronic endoscope not only greatly improves the diagnosis capability, but also reduces the discomfort of patients to the minimum degree; the electronic endoscope puts the CMOS image sensor into the human body to realize real-time video acquisition, signals are output to a display after image processing, and a doctor observes a lesion part in the human body; in order to ensure the image quality, the acquired video signals are not compressed, for example, a 1080P resolution sensor is used, the color depth is 10 bits, the frame frequency is 30fps, the data transmission bandwidth is 622Mbps, the 3D endoscope needs two-way video acquisition, and the data bandwidth is 1244 Mbps. The image sensor generally adopts an MIPI CSI-2 interface, the effective transmission distance is about 0.3m, however, in general endoscope application, video image data need to be transmitted to an image processor beyond 3-4m, the requirements of narrow space (diameter 10mm) and imaging quality of the endoscope are limited, and the requirements of bandwidth, signal line number and chip size of a traditional communication LVDS bus are difficult to meet; although the optical transmission method is introduced to extend the transmission distance, the introduction of the optical fiber and the electro-optical and electro-optical conversion will make the whole solution cost high and not beneficial to miniaturization.
Disclosure of Invention
The present disclosure provides a 3D endoscope high definition video acquisition and transmission system and method to solve the above problems, such as poor transmission reliability, too large circuit size, being not conducive to miniaturization, and high cost for video image long distance transmission in endoscope application.
In order to achieve the above purpose, a first aspect of the present disclosure provides a 3D endoscope high definition video acquisition and transmission system, which adopts the following technical solutions:
A3D endoscope high-definition video acquisition and transmission system comprises a lens, a control box and a video receiving end;
the camera lens comprises two paths of CMOS image sensors and a serial PHY chip and is used for collecting video data, and the collected video data are output to the serial PHY chip through an MIPI CSI-2 interface;
the control box is connected with the lens through a double-shaft cable and comprises two paths of MIPI CSI-2 interfaces and a deserializing PHY chip; serial video data in the serial PHY chip are transmitted to the control box through a dual-axis cable;
the control box is connected with the video receiving end through an FPD-Link III serial bus, the deserializing PHY chip realizes data deserializing, and deserialized videos are output to the video receiving end through two paths of MIPI interfaces respectively.
Furthermore, the maximum image acquisition frame frequency of the two CMOS image sensors is 60fps, the video output interface is MIPI CSI-2, the single-channel highest rate is 1000Mbps, and a clock signal source is provided by a 24M crystal oscillator.
Furthermore, the deserializing PHY chip realizes the data receiving and sending of the bandwidth 4 Gbps.
Furthermore, the control box realizes data deserialization, obtains data transmission and restores the data transmission into an MIPI CSI-2 interface, converts the MIPI interface into a parallel interface through a bridge chip, is in butt joint with a serial chip, transmits video data to a post-processing receiving end, converts the video data into the parallel interface through a deserializing chip and outputs the video data, and sends the video data to the video receiving end after digital isolation.
Furthermore, the control box also comprises an electrically erasable programmable read-only memory which is used for storing endoscope ID and use frequency information and carrying out read-write configuration through a bus.
In order to achieve the above purpose, a second aspect of the present disclosure provides a 3D endoscope high definition video acquisition and transmission method, which adopts the following technical solutions:
A3D endoscope high definition video acquisition and transmission method comprises the following contents:
two paths of CMOS image sensors are adopted to collect video data, and the collected video data are output to a serial PHY chip through an MIPI interface;
serial video data in the serial PHY chip is transmitted to the deserializing PHY chip through the dual-axis cable;
and the deserializing PHY chip realizes data deserializing, and deserialized videos are output to the video receiving end through two paths of MIPI interfaces respectively.
Furthermore, the maximum image acquisition frame frequency of the two CMOS image sensors is 60fps, the video output interface is MIPI CSI-2, the single-channel highest rate is 1000Mbps, and a clock signal source is provided by a 24M crystal oscillator.
Furthermore, the deserializing PHY chip realizes the data receiving and sending of the bandwidth 4 Gbps.
Furthermore, the deserializing PHY chip deserializes data, obtains data transmission and restores the data transmission to be an MIPI interface, converts the MIPI interface into a parallel interface through a bridge chip, is in butt joint with a serial chip, transmits video data to a post-processing receiving end, converts the video data into the parallel interface through the deserializing chip, outputs the video data through the parallel interface, and sends the video data to the video receiving end after digital isolation.
Furthermore, an electrically erasable programmable read-only memory is adopted to store the endoscope ID and the using time information, and read-write configuration is carried out through a bus.
Compared with the prior art, the beneficial effect of this disclosure is:
1. the total transmission bandwidth of the disclosed data can reach 2Gbps, wherein the transmission bandwidth between a lens and a handle control box is 4Gbps, two FPD-Link III protocol interfaces are adopted between the control box and a clock processing terminal, the bandwidth of each path can reach 1Gbps, and the bandwidth of the two paths is 2 Gbps; the data bandwidth of 1080p video (color depth 10bit) with the frame frequency of 30fps is 622Mbps, the 3D endoscope needs two paths of videos, the transmission bandwidth accounts for 1244Mbps, and the requirement of related transmission bandwidth can be met.
2. In the aspect of transmission distance, the distance between the CMOS sensor and the MIPI serial chip is less than 10mm and is within the range of MIPI CSI-2 nominal transmission distance; an MIPI serial transceiving PHY is adopted between the lens and the handle control box, the transmission distance can reach 1m, and the requirement of the endoscope on the transmission distance of 0.6m can be met; the control box and the video processing terminal are communicated through an FPD-Link III protocol, the transmission distance can reach more than 15m, and the requirement of the endoscope on the transmission distance of 3-4m can be met.
3. The chip packaging size is mainly limited to the lens part, the diameter of the lens part is 10mm, the circuit adopts two 3.8x2.9mm CMOS chips and 7x7mm MIPI serial chips, the design size of the PCB is smaller than 9mm, and through actual assembly tests, the product requirements can be met.
4. The high-speed serial differential interface is adopted, and the signal anti-interference performance is high. According to relevant EMC national standards, the 3D endoscope video transmission circuit is actually tested, and the video transmission is confirmed to be stable and reliable, and the image quality is good.
5. The circuit hardware cost and the production and assembly process requirements are met; through cost accounting, the hardware cost of the circuit is reduced by more than 40% compared with the prior scheme, the assembly process is simple, compared with an optical fiber transmission scheme, the twisted pair cable is not easy to damage, and the maintenance and the replacement are simple.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the present embodiments, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the present embodiments and together with the description serve to explain the present embodiments without unduly limiting the present embodiments.
Fig. 1 is a front end hardware block diagram of an endoscope in accordance with embodiment 1 of the present disclosure;
fig. 2 is a circuit block diagram of an endoscopic video processing terminal according to embodiment 1 of the present disclosure;
fig. 3 is a block diagram of a circuit between the lens and the control box according to embodiment 1 of the present disclosure;
fig. 4 is a control box MIPI-to-parallel circuit according to embodiment 1 of the present disclosure;
FIG. 5 is an FPD-Link serial circuit of embodiment 1 of the present disclosure;
FIG. 6 is an FPD-Link deserializing circuit of embodiment 1 of the present disclosure;
fig. 7 is a block diagram of a transmission circuit between the control box and the video processing terminal according to embodiment 1 of the present disclosure.
The specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
Example 1:
as shown in fig. 1 and fig. 2, the present disclosure provides a 3D endoscope high definition video acquisition and transmission system, which includes a lens, a handle control box and a video receiving end.
The lens part is integrated with two 1/6 CMOS image sensors, preferably, the CMOS image sensors are of an OV2740 model, the resolution is 1920x1080, the packaging size is 3.8x2.9mm, the maximum image acquisition frame frequency is 60fps, the video output interface is MIPI CSI-2, the single-channel highest rate is 1000Mbps, and a clock signal source is provided by a 24M crystal oscillator.
Specifically, as shown in fig. 1, two CMOS sensors collect video data, and output the video data to a serial PHY chip through an MIPI interface, the serial video data is transmitted to the control box through a dual-axis cable, the deserializing PHY chip realizes data deserialization, and videos are output through two MIPI interfaces respectively; the serial deserializing PHY chip can realize the data receiving and transmitting with the bandwidth as high as 4Gbps, and completely meets the bandwidth requirement of two-path video transmission.
As shown in fig. 1, the handle control box part realizes data deserialization to obtain data transmission and recover the data transmission into an MIPI interface, the MIPI CSI-2 interface is converted into a parallel interface through a toshiba bridge chip, a PFD-Link III serial chip is butted, video data is transmitted to a post-processing receiving end, the video data is converted into a parallel interface through an FPD-Link III deserialization chip and output, and the output is sent into the video processing unit after digital isolation; the serial chip model adopts DS90UB913AQ, and the deserializing chip model adopts DS90UB 914.
As shown in FIG. 1, EEPROM (electrically erasable programmable read-only memory) is used to store endoscope ID and usage times information, via I2C bus for read-write configuration, in particular, I2The C bus is responsible for realizing the configuration management of CMOS image sensor, MIPI parallel conversion and FPD-Link III serial deserializing chips, I2The main end of the C bus is a video processing terminal.
The embodiment can realize the remote transmission of the video image; the maximum wiring length proposed by the MIPI CSI-2 specification is 25-30cm, and the distance between the CMOS image sensor and the MIPI serial chip is less than 10mm in the embodiment; the transmission distance between MIPI serial/deserializing chips can reach, and the actual circuit distance does not exceed 60 cm; the control box is connected with the video processing terminal through an FPD-Link III serial bus, and video image data in general endoscope application needs to be transmitted to an image processor beyond 3-4 meters. According to the technical manual of the chip official TI company, the coaxial cable with the length of 15m or the shielding twisted-pair cable with the length of 20m can be connected, and the transmission distance requirement can be completely met.
The CMOS collected video data are output through MIPI CSI-2, transmitted to the handle control box through the serial/deserializing chip and transmitted to the video processing terminal through the FPD-Link III serial bus; the high-speed serial differential interfaces are adopted in video transmission, the anti-interference capability is strong, and the circuit design meets the reliability requirement of medical instruments.
The diameter of the lens part of the endoscope is 10mm, the space is very narrow, and the requirement on the packaging size of the chip is high; the FPGA chip is adopted to realize a high-speed serial interface or the MIPI CSI-2 is converted into an LVDS interface, so that the packaging size is overlarge, the heat productivity is large, the cost is high, and the miniaturization design of the endoscope head end is not facilitated; the scheme of converting MIPI CSI-2 into DVP causes the number of transmission data lines to be too large, and is not beneficial to the reduction of the diameter of a main hose of the endoscope and the simplification of welding assembly; the serial chip used in this embodiment has a package size of 7mm × 7mm, and a maximum power of 18 mW.
Example 2:
the embodiment provides a 3D endoscope high-definition video acquisition and transmission method, which comprises the following steps:
two paths of CMOS image sensors are adopted to collect video data, and the collected video data are output to a serial PHY chip through an MIPI interface; specifically, the maximum image acquisition frame frequency of the two CMOS image sensors is 60fps, the video output interface is MIPI CSI-2, the single-channel highest rate is 1000Mbps, and a clock signal source is provided by a 24M crystal oscillator.
Serial video data in the serial PHY chip is transmitted to the deserializing PHY chip through the dual-axis cable; specifically, the deserializing PHY chip realizes the data transceiving of 4Gbps in bandwidth.
The deserializing PHY chip realizes data deserializing, and deserialized videos are output to the video receiving end through two paths of MIPI interfaces respectively; the deserializing PHY chip realizes data deserializing, obtains data transmission and restores the data transmission into an MIPI interface, converts the MIPI interface into a parallel interface through a bridge chip, is in butt joint with a serial chip, transmits video data to a post-processing receiving end, converts the video data into a parallel interface through the deserializing chip and outputs the parallel interface, and sends the parallel interface to a video receiving end after digital isolation.
In this embodiment, an eeprom is used to store the endoscope ID and the use count information, and read/write configuration is performed through a bus.
Compared with the prior art, the beneficial effect of this disclosure is:
1. the transmission circuit disclosed by the invention adopts a high-speed serial differential interface, has strong signal anti-interference performance and can meet the requirement of reliable data transmission of medical endoscope products;
2. the transmission circuit disclosed by the invention adopts an interface chip to package the transmission circuit small (7mm x 7mm), the data bandwidth is high, the single path can realize the bandwidth as high as 2Gbps, and the requirement of the two-path video bandwidth of the 3D endoscope is met;
3. the circuit solves the problem of short transmission distance of an MIPI interface, can realize the transmission distance of more than 10m by circuit design, and completely meets the transmission requirement of a medical speculum of 3-4 m;
4. the method effectively reduces hardware cost, adopts a scheme of prolonging transmission distance by optical fibers, has high cost, and can not meet the requirement on space.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art can make various modifications and variations. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present embodiment should be included in the protection scope of the present embodiment.
Claims (10)
1. A3D endoscope high definition video acquisition transmission system is characterized by comprising a lens, a control box and a video receiving end;
the lens comprises two paths of CMOS image sensors and a serial PHY chip and is used for collecting video data, and the collected video data are output to the serial PHY chip through an MIPI interface;
the control box is connected with the lens through a double-shaft cable and comprises two paths of MIPI interfaces and a deserializing PHY chip; serial video data in the serial PHY chip are transmitted to the control box through a dual-axis cable;
the control box is connected with the video receiving end through an FPD-Link III serial bus, the deserializing PHY chip realizes data deserializing, and deserialized videos are output to the video receiving end through two paths of MIPI interfaces respectively.
2. The 3D endoscope high-definition video acquisition and transmission system as claimed in claim 1, wherein the maximum image acquisition frame frequency of the two CMOS image sensors is 60fps, the video output interface is MIPI CSI-2, the single-channel highest rate is 1000Mbps, and a clock signal source is provided by a 24M crystal oscillator.
3. The 3D endoscope high definition video acquisition and transmission system of claim 1, wherein the deserializing PHY chip implements 4Gbps bandwidth data transceiving.
4. The 3D endoscope high definition video acquisition and transmission system according to claim 1, characterized in that the control box realizes data deserialization, obtains data transmission and restores the data transmission to MIPI interface, converts the MIPI interface into parallel interface through bridge chip, connects serial chip, transmits video data to post-processing receiving end, converts into parallel interface through deserializing chip and outputs, and sends into video receiving end after digital isolation.
5. The 3D endoscope high definition video acquisition and transmission system according to claim 1, characterized in that the control box further comprises an electrically erasable programmable read only memory for storing endoscope ID and use time information, and the read and write configuration is performed through a bus.
6. A3D endoscope high definition video acquisition and transmission method is characterized by comprising the following steps:
two paths of CMOS image sensors are adopted to collect video data, and the collected video data are output to a serial PHY chip through an MIPI interface;
serial video data in the serial PHY chip is transmitted to the deserializing PHY chip through the dual-axis cable;
and the deserializing PHY chip realizes data deserializing, and deserialized videos are output to the video receiving end through two paths of MIPI interfaces respectively.
7. The 3D endoscope high-definition video acquisition and transmission method as claimed in claim 6, wherein the maximum image acquisition frame frequency of the two CMOS image sensors is 60fps, the video output interface is MIPI CSI-2, the single-channel highest rate is 1000Mbps, and a clock signal source is provided by a 24M crystal oscillator.
8. The 3D endoscope high definition video acquisition and transmission method according to claim 6, characterized in that the deserializing PHY chip realizes the data transceiving with the bandwidth of 4 Gbps.
9. The method for 3D endoscope high definition video collection and transmission according to claim 6, characterized in that the deserializing PHY chip realizes data deserialization, the obtained data transmission is restored to MIPI interface, the MIPI interface is converted to parallel interface through bridge chip, the serial chip is connected, the video data is transmitted to the post-processing receiving end, and the deserializing chip is converted to parallel interface for output, and the output is sent to the video receiving end after digital isolation.
10. The method for 3D endoscope high definition video capture and transmission according to claim 6, characterized in that an electrically erasable programmable read only memory is used to store endoscope ID and usage times information, and read and write configuration is performed through a bus.
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