CN113834823B

CN113834823B - Endoscope contamination detection device and contamination detection method

Info

Publication number: CN113834823B
Application number: CN202111428542.5A
Authority: CN
Inventors: 吴一凡; 蔡显兵
Original assignee: Zhejiang Huanuokang Technology Co ltd
Current assignee: Zhejiang Huanuokang Technology Co ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-04-08
Anticipated expiration: 2041-11-29
Also published as: CN113834823A

Abstract

The invention relates to an endoscope contamination detection device and a contamination detection method. The endoscope contamination detection device is used for being in butt joint with an endoscope and comprises a main body, wherein an RGB (red, green and blue) three-color lamp assembly is fixedly arranged on the main body and is just opposite to an optical filter of the endoscope, and the RGB three-color lamp assembly can emit red, green and blue monochromatic light and can be switched among the red, green and blue three-color light; monochromatic light emitted by the RGB three-color lamp assembly penetrates through the optical filter, is received by a sensor of the endoscope and is imaged; monochromatic light emitted by the RGB three-color lamp assembly can be switched among red, green and blue three-color light, so that the color of the auxiliary light during imaging can be switched among the three colors, and the image under the three-color auxiliary light is subjected to smudging judgment through the host, so that the situation that the host judges wrongly due to the fact that partial smudging happens to the fact that the transmittance or the reflectivity of the auxiliary light of a certain single color is higher is avoided.

Description

Endoscope contamination detection device and contamination detection method

Technical Field

The present invention relates to the field of endoscopes, and in particular, to an endoscope contamination detection device and a contamination detection method.

Background

The endoscope is provided with components such as an image sensor, an optical lens, a light source illumination device, a mechanical device and the like, can enter the stomach through a mouth or be inserted into the body through other pore canals, and displays the condition inside the human body on an external screen in an image mode so as to be convenient for a doctor to observe and diagnose;

when the endoscope is used, dirt is easily adhered to the inner side and the outer side of the lens and the outer side of the optical filter, and when the dirt is adhered to the outer side of the optical filter, because the distance between the optical filter and the sensor is short, black spots or even large black spots can be generated on an image during imaging, so that the normal judgment of a doctor in an operation is easily influenced;

at present, the dirt is mostly judged by human eyes, but in the process of judging the dirt by the human eyes, factors such as ambient light, the vision of an observer, the dirt color and the like can influence the judgment of the observer, so the judgment precision is low; some methods for judging dirt through photographing and analyzing an image through a computer exist, however, in such methods, a single light source is mostly adopted as a background, and light transmittance emitted by the light source is different according to different dirt compositions, so that the method has poor judgment accuracy on dirt with high light transmittance emitted by the single light source, and is easy to cause misjudgment of the computer.

Disclosure of Invention

In view of the above, it is desirable to provide an endoscope contamination detection apparatus and a contamination detection method, which are directed to a problem that different contamination on an optical filter of an endoscope has different transmittances to a light source, and may cause erroneous judgment by a computer.

The invention firstly provides an endoscope contamination detection device which is used for being butted with an endoscope and comprises a main body, wherein an RGB (red, green and blue) three-color lamp assembly is fixedly arranged on the main body, the RGB three-color lamp assembly is opposite to an optical filter of the endoscope, and the RGB three-color lamp assembly can emit red, green and blue monochromatic light and can be switched among the red, green and blue three-color light.

The endoscope contamination detection device transmits monochromatic light emitted by the RGB three-color lamp assembly through the optical filter, is received and imaged by the sensor of the endoscope, ensures higher brightness of an imaged image, and is convenient for a subsequent host to judge whether the image is contaminated or not; monochromatic light emitted by the RGB three-color lamp assembly can be switched among red, green and blue three-color light, so that the color of the auxiliary light during imaging can be switched among the three colors, and the image under the three-color auxiliary light is subjected to smudging judgment through the host, so that the situation that the host judges wrongly due to the fact that partial smudging happens to the fact that the transmittance or the reflectivity of the auxiliary light of a certain single color is higher is avoided.

In one embodiment, the main body is provided with an installation cavity with an opening opposite to the optical filter, the RGB three-color lamp assembly and the focusing assembly are both arranged in the installation cavity, and the focusing assembly is located between the RGB three-color lamp assembly and an interface of the installation cavity.

With the arrangement, the focal length can be adjusted through the manual focusing assembly, so that light rays emitted by the RGB three-color lamp assembly can form clear images when being received by the sensor of the endoscope, and a dirt judgment program of the host computer can judge whether the optical filter is dirty or not.

In one embodiment, a light homogenizing member is further arranged in the mounting cavity and positioned between the opening of the mounting cavity and the RGB three-color lamp assembly.

So set up, guarantee that the light intensity that the sensor of endoscope received is comparatively even for the light intensity difference of different positions only comes from with dirty sheltering from, reduces because of the uneven error that brings of auxiliary light intensity, and then increases the dirty judgement procedure's of host computer judgment precision.

In one embodiment, the light homogenizing member is a light homogenizing film, and the light homogenizing film is arranged on the light emitting side of the RGB three-color lamp assembly.

In one embodiment, the main body is further provided with a power supply assembly electrically connected to the RGB three-color lamp assembly.

So set up to make the dirty detection device of endoscope of this application can be through inside independent power supply, need not outside wiring can directly use, thereby the reduction of this application uses the degree of difficulty.

In one embodiment, a C-shaped interface is fixedly arranged on the inner side wall of the opening of the installation cavity, so that the main body can be directly connected with a lens interface of the endoscope.

So set up, on the one hand can increase the general nature of this application, is applicable to different endoscopes, and on the other hand also can guarantee to fix firmly between main part and the endoscope.

A second aspect of the present invention provides a contamination detection method using the endoscope contamination detection apparatus according to any one of the embodiments described above, the contamination detection method including the steps of:

docking the endoscope contamination detection device with an endoscope;

starting an RGB (red, green, blue) three-color lamp assembly and the endoscope so that monochromatic light emitted by the RGB three-color lamp assembly is irradiated to the endoscope through a filter of the endoscope; and

judging whether the optical filter is dirty or not according to the image obtained by the endoscope;

wherein the RGB three-color lamp assembly switches the color of the monochromatic light at preset intervals.

In one embodiment, the step of determining whether the optical filter is dirty or not according to the image obtained by the endoscope comprises

The endoscope converts the light intensity detected by each pixel of the obtained image into a digital signal and transmits the digital signal to the host;

the host judges whether the light intensity value of each pixel is within the light intensity threshold range, and the pixels with the light intensity values not within the light intensity threshold range are regarded as abnormal pixels; and

and the host judges whether the ratio of the number of abnormal pixels to the total number of pixels in each specified area exceeds an abnormal ratio or not, and the specified area exceeding the abnormal ratio is determined as the existence of dirt.

In one embodiment, the specified area is a square area with three hundred pixels in length and width;

when the minimum value and the maximum value of the light intensity of the pixels collected by the endoscope are X1 and X2 respectively, the light intensity threshold range is

To

(ii) a And

the anomaly ratio was 20%.

In one embodiment, the RGB tri-color light assembly switches the color of the monochromatic light every three seconds.

So set up to under this frequency, detection efficiency is higher relatively, and the computing performance of the most host computers can accomplish the work of judging the dirt under this frequency.

Drawings

FIG. 1 is a front view of an endoscope;

FIG. 2 is a schematic perspective view of the present invention;

FIG. 3 is a schematic flow chart of a contamination detection method according to the present invention;

FIG. 4 is a flow chart illustrating a portion of the steps of the contamination detection method of the present invention.

Description of the main elements

100. A main body; 10. an RGB three-color light assembly; 20. a focusing assembly; 30. a mounting cavity; 40. a C-type interface;

200. an endoscope; 210. an optical filter; 220. a lens interface.

The present invention is described in further detail with reference to the drawings and the detailed description.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

at present, most of dirt depends on human eyes for judgment, but in the process of judging the human eyes, factors such as ambient light, the vision of an observer, the color of the dirt and the like can influence the judgment of the observer, and the positions of optical filters of part of endoscopes are deeper, as shown in fig. 1, so that the precision of judging the human eyes is lower;

some smudging determination methods in the field of cameras use computers to perform smudging determination, for example, CN112583999A — camera module lens smudging detection method, which processes and divides an image into blocks, obtains an average brightness of each block, compares the average brightness of adjacent blocks, and determines that the area is dirty if the brightness difference is greater than a threshold value;

however, the judgment accuracy of such a method is greatly influenced by the image background, for example, when the brightness of the background light is low, the average brightness difference between a dirty block and an adjacent block may be small, so that erroneous judgment is easily caused;

other methods, such as CN110012287B — self-inspection of smudging of digital camera image sensor based on retina perception, can reduce the effect of background light on subsequent computer judgment by adding a monochromatic light source during image capturing;

however, in the related art of endoscope, depending on the type of endoscope, there are many kinds of stains that may be stained and attached during the operation, and the nature may be greatly different, and the above method also has a possibility of misjudgment, for example:

when the light reflection degree of the dirt to the auxiliary light source is just stronger, the reflected auxiliary light can cause the brightness of the surrounding area to be obviously increased, thereby causing the judgment error of a computer; or

When the contamination is just organ liquid with strong light transmittance to the auxiliary light source, the computer may not detect the brightness difference between the region and other regions, and the computer may also make the judgment wrong.

In addition, since the dirt having a strong light reflection degree or transmittance to the auxiliary light source occupies a relatively small proportion compared with the whole dirt, even if the dirt still exists on the optical filter during the actual detection and use of the endoscope, the dirt may be determined as a normal determination error of the computer and ignored;

it is also difficult to detect the problem that a portion of the special contamination may be missed by using the auxiliary light source of a single color when judging that the endoscope is contaminated.

In view of the above problems, the present application provides an endoscope contamination detection apparatus for docking with an endoscope 200, as shown in fig. 1 and 2, the apparatus includes a main body 100, the main body 100 is fixedly provided with an RGB three-color lamp assembly 10, the RGB three-color lamp assembly 10 is directly opposite to an optical filter 210 of the endoscope 200, and the RGB three-color lamp assembly 10 can emit red, green, and blue monochromatic lights and can switch between the red, green, and blue lights.

After the endoscope contamination detection device is in butt joint with the endoscope 200, monochromatic light emitted by the RGB three-color lamp assembly 10 can penetrate through the optical filter 210, and is received and imaged by a sensor of the endoscope 200, so that the imaging brightness is high, and a subsequent host can conveniently judge whether contamination exists in an image;

monochromatic light emitted by the RGB three-color lamp assembly 10 can be switched among three colors of red, green, and blue, so that the color of the auxiliary light during imaging can be switched among the three colors, and the image under the auxiliary light of the three colors is subjected to smudging judgment by the host, thereby avoiding occurrence of erroneous judgment of the host due to higher transmittance or reflectance of partial smudging of the auxiliary light of a single color.

The color switching time of the RGB light assembly 10 may be further determined based on the required detection efficiency, the computing performance of the host computer used to determine the smudging, and other factors. Preferably, the RGB tristimulus lamp assembly 10 switches the monochromatic light colors every 3 seconds; under this frequency, detection efficiency is relatively higher, and the computing performance of most host computers can accomplish the work of judging the dirt under this frequency.

In some embodiments, the RGB three-color lamp assembly 10 can also emit light rays of other colors formed by combining three primary colors of red, yellow and blue, and therefore, the light ray as the auxiliary light may also be light rays of other arbitrary colors as long as the RGB three-color lamp assembly 10 still has three different colors and can switch between the three colors, and the contrast between the three colors is relatively high;

the contrast ratio is relatively high, so that even if one color is just transmitted or reflected by the dirt, the image imaged by the illumination of the auxiliary light of other colors can be accurately recognized by the host computer, and the dirt position can be judged.

In some embodiments, the RGB tri-color light assembly 10 includes an RGB light panel, a plurality of RGB lights, a single chip microcomputer and an LED driving circuit, the single chip microcomputer the RGB lights and the LED driving circuit all set up in the RGB light panel, the RGB lights can emit three kinds of monochromatic lights of red, yellow and blue, and is located the RGB light panel is just right the one side of the endoscope 200, the LED driving circuit respectively with the single chip microcomputer and the RGB lights are electrically connected, the single chip microcomputer can pass through the LED driving circuit control the RGB lights are switched between three kinds of colored lights of red, green and blue.

In the embodiment shown in fig. 2, the main body 100 is provided with a mounting cavity 30 with an opening facing the optical filter 210, the RGB three-color lamp assembly 10 and the focusing assembly 20 are both disposed in the mounting cavity 30, and the focusing assembly 20 is located between the interfaces of the RGB three-color lamp assembly 10 and the mounting cavity 30.

Here, the interface of the mounting chamber 30 refers to an end face of the mounting chamber 30 for docking with the endoscope 200; by providing the focusing assembly 20 between the interface of the installation cavity 30 and the RGB three-color lamp assembly 10, the focusing assembly 20 can be manually adjusted to adjust the focal length, so that the light emitted by the RGB three-color lamp assembly 10 can be imaged substantially clearly when received by the sensor of the endoscope 200, and the contamination determination program of the host computer can determine whether the optical filter is contaminated.

In some embodiments, a light uniformizing member is further disposed in the mounting cavity 30 and between the opening of the mounting cavity 30 and the RGB three-color lamp assembly 10; so that the light that RGB tricolor light subassembly 10 sent is comparatively even to guarantee that the light intensity that the sensor of endoscope 200 received is comparatively even, guarantee that the light intensity difference of different positions only comes from with the sheltering from of filth, reduce because of the uneven error that brings of auxiliary light intensity, and then increase the judgement precision of the filth judgement procedure of host computer.

The light uniformizing member may be any member capable of converting light emitted from the RGB three-color lamp assembly 10 into a surface light source, such as a light uniformizing plate, a light uniformizing film, or frosted glass. Preferably, the light uniformizing member is a light uniformizing film, and the light uniformizing film is disposed on the light emission side of the RGB three-color lamp assembly 10.

In some embodiments, the main body 100 is further provided with a power supply assembly electrically connected to the RGB three-color lamp assembly 10; the endoscope contamination detection device can be independently powered internally and can be directly used without external wiring, so that the use difficulty is reduced;

preferably, the power supply assembly adopts a lithium battery, so that the requirement of repeated use can be met through subsequent charging, and the use cost of the device is reduced.

In some embodiments, the power supply assembly is disposed on the RGB lamp panel and electrically connected to the single chip and the LED driving circuit.

In the embodiment shown in fig. 1 and 2, the C-shaped interface 40 is fixedly arranged on the inner side wall of the opening of the installation cavity 30, so that the main body 100 can be directly connected with the lens interface 220 of the endoscope 200; therefore, the main body 100 is convenient to butt joint with the endoscope 200, and the use difficulty of the endoscope is reduced;

in addition, because the C-shaped interface 40 is a professional lens interface, the universal use of the present application can be increased by connecting the C-shaped interface 40, so that the present application is suitable for different endoscopes 200, and on the other hand, the main body 100 and the endoscope 200 can be firmly fixed.

The present invention also provides a contamination detection method, which uses the above endoscope contamination detection apparatus, and as shown in fig. 3, includes the following steps:

butting the endoscope contamination detection device with an endoscope;

starting the RGB three-color lamp assembly and the endoscope so that monochromatic light emitted by the RGB three-color lamp assembly is irradiated to the endoscope through a light filter of the endoscope; and

Referring to FIG. 4, the step of determining whether the optical filter is contaminated according to the image obtained by the endoscope includes

the host judges whether the ratio of the number of abnormal pixels to the total number of pixels in each specified area exceeds an abnormal ratio, and the specified area exceeding the abnormal ratio is determined as the existence of dirt.

Because the image sensor used in the endoscope is CMOS at present, each pixel of the CMOS can only sense one color, and the light intensity detected by each pixel of the obtained image is converted into a digital signal through the endoscope, namely the light intensity of 0-1023 can be expressed through a 10-bit digital signal, so that the signal transmission to a host is facilitated.

In some embodiments, the defined region is a square region with three hundred pixels in length and width; the setting of the predetermined region may be determined based on factors such as the dirty area and the calculation performance of the host computer;

in the normal use process of the endoscope, the dirty area attached to the filter 210 of the endoscope 200 is mostly close to 300 × 300 pixels, and by setting the specified area to be a square area of 300 × 300 pixels, the relatively accurate dirty positioning can be realized while reducing the requirement on the calculation performance of the host computer;

if the range of the predetermined area is further narrowed, although the contamination can be more accurately positioned, the number of times of the host determination program is increased, which increases the demand for the host computing performance and increases the cost.

In some embodiments, when the minimum and maximum light intensity values of the pixels collected by the endoscope are X1 and X2, respectively, the light intensity threshold ranges

To

(ii) a The light intensity threshold range can be determined comprehensively according to the light intensity of the auxiliary light emitted by the RGB three-color lamp assembly 10, the transmittance of different stains to the auxiliary light, and other factors;

the higher the dirty transmittance is, the smaller the difference between the detected light intensity value of the dirty region and the light intensity value of the normal region is, so that the light intensity threshold range needs to be set smaller, and the same principle is applied to the contrary;

in some embodiments, the anomaly ratio is 20%; the abnormal ratio can be determined by comprehensively considering factors such as the dirty area, the predetermined area, and the light intensity threshold range.

In some embodiments, the RGB tri-color light assembly switches the monochromatic light colors every three seconds; under this frequency, detection efficiency is relatively higher, and the computing performance of most host computers can accomplish the work of judging the dirt under this frequency.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The endoscope contamination detection device is used for being in butt joint with an endoscope (200), and is characterized by comprising a main body (100), wherein an RGB (red, green and blue) tricolor lamp assembly (10) is fixedly arranged on the main body (100), the RGB tricolor lamp assembly (10) is right opposite to an optical filter (210) of the endoscope (200), and the RGB tricolor lamp assembly (10) can emit red, green and blue monochromatic light and can be switched among the red, green and blue three-color light; the LED lamp comprises a main body (100), wherein an installation cavity (30) with an opening opposite to an optical filter (210) is formed in the main body (100), an RGB (red, green and blue) tricolor lamp assembly (10) and a focusing assembly (20) are arranged in the installation cavity (30), and the focusing assembly (20) is located between interfaces of the RGB tricolor lamp assembly (10) and the installation cavity (30).

2. The endoscope stain detection apparatus according to claim 1, wherein a light uniformizer is further provided in the installation cavity (30) between the opening of the installation cavity (30) and the RGB tricolor light assembly (10).

3. The endoscope contamination detection device according to claim 2, wherein the light uniformizing member is a light uniformizing film provided on a light emission side of the RGB three-color lamp assembly (10).

4. The endoscopic contamination detection device according to claim 1, wherein the main body (100) is further provided with a power supply assembly electrically connected with the RGB three-color light assembly (10).

5. The endoscope contamination detection device according to claim 1, wherein a C-shaped port (40) is fixedly provided on an inner side wall of the opening of the installation cavity (30) so that the main body (100) can be directly connected with a lens port (220) of the endoscope (200).

6. A contamination detection method using the endoscope contamination detection device according to any one of claims 1 to 5, the contamination detection method comprising the steps of:

docking the endoscope contamination detection device with the endoscope;

7. The contamination detection method according to claim 6, wherein the step of determining whether the optical filter is contaminated or not based on the image obtained by the endoscope includes

8. The contamination detection method according to claim 7, wherein the predetermined region is a square region having three hundred pixels each in length and width;

To

(ii) a And

the anomaly ratio was 20%.

9. The contamination detection method according to claim 8, wherein the RGB three-color lamp assembly switches the color of the monochromatic light every three seconds.