TWI812178B - An optical device - Google Patents

Abstract

The present disclosure provides an optical device comprising: a light source; a light shield provided with an annular light-transmitting structure, the light shield being provided on top of the light source; a spotting lens provided on top of the light shield, corresponding to the position of the annular light-transmitting structure; a detection carrier having a detection holding slot for setting color-printed contact lenses to be detected, the detection carrier being at least partially capable of transmitting light, the detection carrier being provided on top of the spotting lens; light emitted from the light source, being at least partially capable of sequentially emitting through the annular light-transmitting structure, converging and emitting through the spotting lens, transmitting the detection carrier and irradiating the color-printed contact lenses to be detected set in the detection holding slot The light emitted by the light source is at least partially able to be emitted by the ring-shaped light-transmitting structure, converge and emitted by the spotting lens, transmit the detection carrier and irradiate the color printing contact lens to be detected set in the detection holding slot, which is able to diffusely reflect the physical defects on the lens surface of the color printing contact lens to be detected, and avoid the development of the pattern part of the lens.

Description

an optical device

The present invention relates to the field of optical technology, and in particular to an optical device.

Contact lenses are lenses worn on the cornea of the eye to correct vision or protect the eyes. According to the softness and hardness of the material, it includes three types: hard, semi-hard and soft. Most contact lenses today are soft. Quality inspection of soft contact lenses is very difficult. The lenses are made of transparent material and float in liquid in most cases. Color-printed contact lenses (commonly known as "color contact lenses") use color printing technology and equipment to print colored patterns and patterns on the surface of soft contact lenses. Usually, a blank space is left in the center of the pattern and pattern as the optical zone of the lens, which is consistent with the function of non-color printed contact lenses. The patterns and patterns in the color printing area play a beautifying role. However, the printed patterns and patterns will cover or overlap the physical defects in some areas of the lens in the optical imaging, as shown in Figure 1, making it difficult for physical defects in the color-printed area of color-printed contact lenses to be detected by machine vision inspection methods. This problem is currently urgently needed. solve.

The present invention proposes an optical device to solve the problem that physical defects in the color printing area of current color printing contact lenses are covered or overlapped by patterns and patterns in optical imaging.

The invention provides an optical device, including: a light source; a light-shielding plate provided with an annular light-transmitting structure; the light-shielding plate is provided on the light source; a condenser lens is provided on the light-shielding plate and is connected with the light-shielding plate. The positions of the annular light-transmitting structures correspond to each other; the detection carrier has a detection accommodation slot for setting the color-printed contact lens to be detected, the detection carrier is at least partially capable of transmitting light, and the detection carrier is arranged corresponding to the light-gathering Above the lens; at least part of the light emitted by the light source can be sequentially emitted through the annular light-transmitting structure, condensed and emitted through the condenser lens, transmitted through the detection container carrier, and illuminated in the detection container. The color-printed contact lenses to be tested are described in .

In some optional embodiments, the main optical axis of the condenser lens is coaxial or approximately coaxial with the center of the annular light-transmitting structure, and the main optical axis of the condenser lens is perpendicular or approximately perpendicular to the annular transmission structure. The plane on which the light structure lies.

In some optional implementations, the light source includes: a light emitting unit and a scattering plate;

The scattering plate is disposed on the light-emitting unit, and the scattering plate can scatter the light emitted by the light-emitting unit.

In some optional embodiments, the light-shielding plate includes a light-shielding portion with a circular hole and a light-shielding disk with a diameter smaller than the circular hole, and the light-shielding disk is disposed in the circular hole and connected with the circular hole. concentric;

The gap between the light-shielding disk and the circular hole forms the annular light-transmitting structure.

In some optional embodiments, the light shielding plate further includes a light-transmitting fixing part;

The light-transmitting fixing part connects the light-shielding part and the light-shielding disc, and covers the annular light-transmitting structure.

In some optional implementations, the focusing lens corresponding to the detection carrier side has a preset distance from the detection receiving groove.

In some optional embodiments, a soaking liquid is provided in the detection holding tank.

In some optional implementations, the wavelength range of the light source emitting light includes at least one of the following:

Monochromatic light, white light or infrared light.

In some optional implementations, the device further includes: an image acquisition device;

The image acquisition device is arranged above the detection carrier of the optical equipment, and can collect images of the color-printed contact lenses to be detected that are arranged in the detection accommodation slot of the detection carrier.

In some optional implementations, the device further includes: an image processing device, connected to the image acquisition device via a network, and the image processing device is configured to obtain images collected by the image acquisition device. image and use a preset processing method to process the image to obtain the detection result of the color-printed contact lens to be detected.

The optical equipment provided by the invention includes: a light source; a light-shielding plate provided with an annular light-transmitting structure, and the light-shielding plate is arranged on the light source; a condenser lens is arranged on the light-shielding plate and corresponds to the position of the annular light-transmitting structure; The detection carrier has a detection accommodation slot for setting the color-printed contact lenses to be detected. The detection carrier is at least partially capable of transmitting light. The detection carrier is correspondingly arranged on the condenser lens; at least part of the light emitted by the light source can pass through the ring in turn. The light-transmitting structure emits, is condensed and emitted by the condenser lens, transmits the detection container carrier, and irradiates the color-printed contact lenses to be detected that are arranged in the detection container. The light that illuminates the color-printed contact lens to be inspected has a certain angle with the main optical axis of the condenser lens, rather than directly irradiating the color-printed contact lens to be inspected along the extension direction of the main optical axis of the convex lens. Therefore, if the lens surface of the color-printed contact lens to be inspected If there is a physical defect, diffuse reflection will occur at the defect, and the illuminated defect can be photographed by the optical influence device. However, because the light is not direct, the pattern of the smooth part of the lens surface of the color-printed contact lens to be inspected cannot be detected in the optical image. Develop.

The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. It can be understood that the specific embodiments described here are only used to explain the relevant disclosure, but not to limit the present invention. It should also be noted that, for convenience of description, only the parts related to the invention are shown in the drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description. It does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of the present invention. limit. Furthermore, the terms “first”, “second” and “third” are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection", etc. should be understood in a broad sense. For example, it can be a fixed connection or a removable connection. Detachable connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the description of the present invention, it should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other as long as there is no conflict.

FIG. 2A is a schematic longitudinal cross-sectional structural diagram of an optical device 200 according to an embodiment of the present invention. As shown in FIG. 2A , the optical device 200 in this embodiment includes: a light source 1 , a light shielding plate 2 , a condenser lens 3 and a detection carrier 4 . in:

The light-shielding plate 2 is provided with an annular light-transmitting structure 21, and the light-shielding plate 2 is arranged on the light source 1. The light source 1 may include various light-emitting devices, such as incandescent lamps, fluorescent lamps, light-emitting diode (LED) lamps, planar light sources, etc. When the light source 1 is in a light-emitting state, the light emitted by the light source 1 can be emitted through the annular light-transmitting structure 21 on the light-shielding plate 2 due to the blocking of the light-shielding plate 2 .

Here, the light-shielding plate 2 can be made of various types of plate-shaped materials. The present invention does not specifically limit this, as long as the light-shielding plate 2 can achieve a light-shielding effect. The ring-shaped light-transmitting structure 21 may be a hollow ring-shaped structure, a ring-shaped structure filled with a transparent medium, or a ring-shaped structure combining a hollow and transparent medium. The specific material of the transparent medium is not limited in the present invention. For example, the transparent medium may include organic glass, polystyrene, polycarbonate, polypropylene, etc.

The condenser lens 3 is disposed on the light-shielding plate 2 and corresponds to the position of the annular light-transmitting structure 21 . In the present invention, the condenser lens 3 only needs to be able to collect light. For example, the condenser lens 3 may include a plano-convex lens, a biconvex lens, a meniscus lens or an optical lens group. This is only an example and is not a specific limitation on the condenser lens 3 .

For example, in some optional embodiments of the present invention, a plano-convex lens is selected as the condenser lens 3 , and the plane end of the plano-convex lens is parallel to the light shielding plate 2 . It can be understood that one end of the plano-convex lens is flat and the other end is convex. After the parallel light beam is injected into the plano-convex lens through the flat end, it is converged and emitted through the convex end. Here, the plano-convex lens can be placed directly against the light-shielding plate 2. Since one side of the plano-convex lens is a flat end, it can be stably placed on the light-shielding plate 2 if it is directly placed against the light-shielding plate 2, and the flat end is directly parallel to the light-shielding plate 2, without the need for Separate debugging reduces the difficulty of the assembly process of the optical equipment; it can also be set at a certain distance from the light-shielding plate 2 to facilitate replacement of the light-shielding plate 2 or adjustment of the annular light-transmitting structure 21 of the light-shielding plate 2 .

In the present invention, the condenser lens 3 can include a spherical lens or an aspherical lens, and technicians can choose according to actual process needs.

The detection carrier 4 has a detection receiving slot 41 for placing the color-printed contact lenses 5 to be detected. The detection carrier 4 is at least partially light-transmissive, and the detection carrier 4 is correspondingly arranged on the condenser lens 3 . The center of the detection carrier 4 can be arranged coaxially or approximately coaxially with the main optical axis of the condenser lens 3 . The detection carrier 4 may be completely light-transmissive or partially light-transmissive, for example, the bottom may be light-transmissive, or the bottom and sides close to the bottom may be at least partially light-transmissive. For example, the detection carrier 4 may include a bowl-shaped light-transmitting container. This is only an example of the detection carrier 4 and is not specifically limited.

The present invention does not specifically limit the fixing method of the device light source 1, light shielding plate 2, condenser lens 3 and detection carrier 4 that constitute the optical device 200. For example, the position of at least one device in the light source 1, the light shielding plate 2, the condenser lens 3 and the detection carrier 4 can be fixed through at least one preset fixing bracket to realize the above-mentioned optical device 200.

FIG. 2B is a schematic diagram of an optical path of an optical device 200 according to an embodiment of the present invention. As shown in FIG. 2B , at least part of the light emitted by the light source 1 can be sequentially emitted through the annular light-transmitting structure 21 , condensed and emitted through the condenser lens 3 , transmitted through the detection container, and illuminated in the detection container 41 to be detected. Color printed contact lenses5.

It can be understood that at least part of the light emitted by the light source 1 is emitted through the annular light-transmitting structure 21 to form a hollow light column. After the light column is condensed by the condenser lens 3, the direction of the emitted light is deflected toward the main optical axis of the condenser lens 3, transmits the detection carrier 4 at an incident angle having a certain angle with the main optical axis of the convex lens, and illuminates the detection holding tank 41. Color printed contact lenses to be tested 5.

The light that illuminates the color-printed contact lens 5 to be inspected has a certain angle with the main optical axis of the condenser lens 3, and does not directly illuminate the color-printed contact lens 5 to be inspected along the main optical axis extension direction of the convex lens. Therefore, if the color-printed contact lens to be inspected There are physical flaws on the lens surface of 5, and diffuse reflection will occur at the flaws, so that the illuminated flaws can be photographed by optical influence equipment. Since the light is not direct, the pattern of the smooth part of the lens surface of the color-printed contact lens 5 to be detected is Unable to develop at optical image.

In some optional implementations, as shown in FIG. 2A , a soaking liquid 42 is provided in the detection holding tank 41 . Soaking solution 42 may include physiological saline or contact lens care solution. The color-printed contact lens 5 to be tested can be immersed in the soaking liquid 42 to prevent the color-printed contact lens from being affected by drying and dehydration during the testing process.

In some optional implementations, the focusing lens 3 corresponding to the detection carrier 4 side has a preset distance from the detection receiving groove 41 . It can be understood that the condenser lens 3 has two focal points in the direction in which the main optical axis extends to both ends. Since in the present invention, the side of the condenser lens 3 corresponding to the light shielding plate 2 serves as the incident end of light, so the condenser lens 3 The focus corresponding to the 2nd side of the light shield is not limited. The focal point of the condenser lens 3 corresponding to the detection carrier 4 side is located on a straight line extending in the direction of the main optical axis of the condenser lens 3 toward the detection carrier 4 side. In this way, the incident angle distribution of the light irradiating the color-printed contact lens 5 to be inspected is even.

The present invention does not specifically limit the inner diameter and outer diameter of the annular light-transmitting structure 21. Technicians can adjust the inner diameter or outer diameter of the annular light-transmitting structure 21 according to actual brightness needs to achieve the required aperture size.

Referring to FIG. 3 , FIG. 3 shows a partial structural diagram of an optical device 300 according to an embodiment of the present invention.

As shown in FIG. 3 , in some optional implementations, the main optical axis of the condenser lens 3 is coaxial or approximately coaxial with the center of the annular light-transmitting structure 21 , and the main optical axis of the condenser lens 3 is perpendicular or approximately perpendicular to the annular shape. The plane where the light-transmitting structure 21 is located. Since it is difficult to achieve an absolute coaxial or perpendicular relationship in the geometric sense in actual processes, the main optical axis of the condenser lens 3 in the present invention and the center of the annular light-transmitting structure 21 are approximately coaxial, including the location of the main optical axis of the condenser lens 3 The distance between the straight line and the center of the annular light-transmitting structure 21 is less than the approximate coaxial determination threshold. The approximate coaxial determination threshold can be set according to the actual detection accuracy. For example, the approximate coaxial determination threshold can be set to 5 mm; similarly, in the present invention, the light gathering The main optical axis of the lens 3 is approximately perpendicular to the plane where the annular light-transmitting structure 21 is located. The relative angle between the straight line where the main optical axis of the condenser lens 3 is located and the plane where the annular light-transmitting structure 21 is located is close to 90 degrees. For example, the relative angle can be 85 degrees. to 90 degrees. In this way, the angle between the light emitted through the annular light-transmitting structure 21 and the main optical axis of the condenser lens 3 after being condensed by the condenser lens 3 is evenly distributed, so that the light emitted in the detection accommodating groove 41 can be irradiated with a uniform incident angle. Detect color-printed contact lenses 5 to avoid local dark areas caused by uneven irradiation from affecting the detection results.

Referring to FIG. 4 , FIG. 4 shows a schematic structural diagram of an optical device 400 according to yet another embodiment of the present invention. In some optional implementations, the light source 1 includes: a light emitting unit 11 and a diffusion plate 12 . The scattering plate 12 is disposed on the light-emitting unit 11, and the scattering plate 12 can scatter the light emitted by the light-emitting unit 11. Here, the light-emitting unit 11 may include various types of light-emitting elements. For example, the light-emitting unit 11 may include at least one LED lamp bead. The specific structure of the scattering plate 12 is not limited in the present invention. The light emitted by the light-emitting unit 11 can be scattered by the scattering plate 12 and then emitted. The specific structure of the scattering plate 12 can refer to the existing technology. For example, the material of the scattering plate 12 may include organic glass, polystyrene, polycarbonate, polypropylene, etc., and the scattering plate 12 has at least one layer of light scattering structure formed of the above materials. Since the LED lamp bead is a point light source, the light it emits is radial. After the light emitted by the LED lamp bead is scattered by the scattering plate 12, a plane light source can be formed. The light is evenly emitted outward from the scattering plate 12, so that the light source 1 can pass through The plane light emitting of the scattering plate 12 increases the effective illumination area in the specified light emitting direction.

In some optional embodiments, the wavelength range of the light source 1 emits light includes at least one of the following: monochromatic light, white light or infrared light. Technicians can select the wavelength of light emitted by the light source 1 according to detection needs. It can be understood that in order to achieve different wavelengths, it can be achieved by setting different light-emitting units 11 for the light source 1 or switching between multiple light-emitting units 11. For example, at least one group of red LED lamp beads, green LEDs can be set. A three-primary-color LED array composed of lamp beads and blue LED lamp beads is the light-emitting unit 11. The wavelength of light emitted by the light source 1 is controlled by respectively controlling the brightness of each color of the lamp beads in at least one group of three-primary color LED arrays.

Referring to FIGS. 5A and 5B , FIGS. 5A and 5B are respectively a top structural schematic diagram and a longitudinal cross-sectional structural diagram of the light shielding plate 2 in an optical device according to some embodiments of the present invention. As shown in Figure 5A, in some optional embodiments, the light shielding plate 2 includes a light shielding portion 24 with a circular hole 23 and a light shielding disk 25 with a diameter smaller than the circular hole 23. The light shielding disk 25 is disposed in the circular hole 23 and Concentric with the circular hole 23. The gap between the light-shielding disc 25 and the circular hole 23 forms an annular light-transmitting structure 21 . In practical applications, the light-shielding portion 24 and the light-shielding disc 25 can be placed correspondingly on the light-emitting surface of the light source 1 , and the positional relationship between the light-shielding portion 24 and the light-shielding disc 25 can be adjusted to form the light-shielding plate 2 .

In some optional implementations, as shown in FIG. 5B , the light shielding plate 2 further includes a light-transmitting fixing part 26 . The light-transmitting fixing part 26 connects the light-shielding part 24 and the light-shielding disc 25 and covers the annular light-transmitting structure 21 . The material of the light-transmitting fixing part 26 is a transparent medium. The specific material of the transparent medium is not limited in the present invention. For example, the transparent medium may include organic glass, polystyrene, polycarbonate, polypropylene, etc. By fixing the light-shielding part 24 and the light-shielding disk 25 by the light-transmitting fixing part 26 and covering the annular light-transmitting structure 21, the structure of the light-shielding plate 2 does not depend on the light-emitting surface support of the light source 1. Technicians can adjust the light-shielding plate 2 and the light-shielding plate 2 as needed. Distance from light source 1.

FIG. 6 is a schematic structural diagram of an optical device 600 according to yet another embodiment of the present invention. As shown in FIG. 6 , the optical device 600 disclosed in FIG. 6 is similar to the optical device 200 shown in FIG. 2A , except that the optical device 600 further includes an image acquisition device 6 . Image capture device 6 may include a video camera or video camera.

The image acquisition device 6 is disposed above the testing carrier 4 and can collect images of the color-printed contact lens 5 to be tested that is disposed in the testing accommodating tank 41 . The lens of the image acquisition device 6 can be directed downward to take imaging of the color-printed contact lens 5 to be inspected placed in the inspection accommodating tank 41 . Figure 7 is an image collected by the optical equipment 600 according to the embodiment of the present invention, the color-printed contact lens 5 to be detected. As shown in Figure 7, physical defects on the lens surface of the color-printed contact lens occur diffuse reflection, which is collected by the image acquisition device 6 The light spots (white spots in Figure 7) are displayed correspondingly in the image. However, the pattern of the smooth part of the lens surface of the color-printed contact lens 5 to be detected cannot be developed in the optical image, so the corresponding position in the image is displayed as a black shadow. (See the black circular shadow in Figure 7).

In some optional implementations, the optical device 600 further includes: an image processing device. The image processing device may include various electronic devices with image data processing capabilities, including but not limited to smartphones, tablet computers, notebook computers, desktop computers, servers, etc., which are not specifically limited here.

The image processing device is connected to the image acquisition device 6 via a network. The image processing device is configured to acquire images collected by the image acquisition device 6 and process the images using a preset processing method to obtain the color-printed contact lenses to be detected. 5 test results. Here, the preset processing method may include a visual algorithm, for example, by acquiring the image collected by the image acquisition device 6, transmitting the image to the processing unit, and through digital processing, according to the pixel distribution, brightness, color, etc. information to determine size, shape, color, etc. Then, the physical defect detection result of the color-printed contact lens 5 to be detected is obtained. This is only a specific application of the visual algorithm. For the specific implementation method of the visual algorithm, reference can be made to the existing technology and will not be described again here.

The above description is only an illustration of the preferred embodiments of the present invention and the technical principles used. Those skilled in the art should understand that the disclosure scope involved in the present invention is not limited to technical solutions formed by a specific combination of the above technical features, but should also cover any solution consisting of the above technical features or without departing from the above disclosed concept. Other technical solutions formed by any combination of equivalent features. For example, a technical solution is formed by replacing the above features with technical features with similar functions disclosed in the present invention (but not limited to).

1:Light source 11:Light-emitting unit 12: Diffusion plate 2: Shade 21: Ring-shaped light-transmitting structure 23: round hole 24:Light shielding part 25:Shading disc 26: Translucent fixed part 3: condenser lens 4: Detection vehicle 41: Detect the receiving tank 42:soaking liquid 5: Color printed contact lenses to be tested 6:Image acquisition device

Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of the non-limiting embodiments with reference to the following drawings: Figure 1 is a schematic diagram of the overlap of patterns and physical defects in the optical imaging of color-printed contact lenses to be detected in the background technology; Figure 2A is a schematic longitudinal cross-sectional structural diagram of an optical device 200 according to an embodiment of the present invention; Figure 2B is a schematic diagram of the optical path of the optical device 200 according to an embodiment of the present invention; Figure 3 is a partial structural diagram of an optical device 300 according to an embodiment of the present invention; Figure 4 is a schematic structural diagram of an optical device 400 according to yet another embodiment of the present invention; Figure 5A is a schematic top structural view of the light shielding plate 2 in an optical device according to some embodiments of the present invention; Figure 5B is a schematic structural diagram of a longitudinal section of the light shielding plate 2 in an optical device according to some embodiments of the present invention; Figure 6 is a schematic structural diagram of an optical device 600 according to another embodiment of the present invention; and Figure 7 is an image collected by the optical device 600 of a color-printed contact lens to be inspected according to an embodiment of the present invention.

1:Light source

11:Light-emitting unit

12: Diffusion plate

2: Shade

21: Ring-shaped light-transmitting structure

3: condenser lens

4: Detection vehicle

41: Detect the receiving tank

42:soaking liquid

5: Color printed contact lenses to be tested

400:Optical equipment

Claims (9)

An optical device, including: a light source, the light source includes: a light-emitting unit and a scattering plate, the scattering plate is arranged on the light-emitting unit, the scattering plate can scatter the light emitted by the light-emitting unit to form a planar light source; A light-shielding plate is provided with an annular light-transmitting structure, and the light-shielding plate is arranged on the light source; a focusing lens is arranged on the light-shielding plate and corresponds to the position of the annular light-transmitting structure; a detection carrier , having a detection accommodation slot for setting the color-printed contact lens to be detected, the detection carrier is at least partially light-transmissive, the detection carrier is correspondingly arranged on the condenser lens; the condenser lens corresponds to the The focus on the side of the detection carrier is located between the condenser lens and the detection carrier; at least part of the light emitted by the light source can be emitted through the annular light-transmitting structure in sequence and first condensed by the condenser lens. Then, the detection carrier is ejected and transmitted in a divergent manner, and the color-printed contact lenses to be detected arranged in the detection accommodation tank are irradiated. The device according to claim 1, wherein the main optical axis of the condenser lens is coaxial or approximately coaxial with the center of the annular light-transmitting structure, and the main optical axis of the condenser lens is perpendicular or approximately perpendicular to the The plane where the annular light-transmitting structure is located. The device according to claim 1, wherein the light-shielding plate includes a light-shielding portion with a circular hole and a light-shielding disc with a diameter smaller than the circular hole, and the light-shielding disc is disposed in the circular hole and connected with the The circular holes are concentric; the gap between the light-shielding disk and the circular hole forms the annular light-transmitting structure. The device according to claim 3, wherein the light-shielding plate further includes a light-transmitting fixing part, the light-transmitting fixing part connects the light-shielding part and the light-shielding disc, and covers the annular light-transmitting structure. The device according to claim 1, wherein the focusing lens corresponding to the detection carrier side has a preset distance from the detection receiving groove. The device according to claim 1, wherein a soaking liquid is provided in the detection holding tank. The device according to claim 1, wherein the wavelength range of the light source emitting light includes at least one of the following: monochromatic light, white light or infrared light. The device according to any one of claims 1 to 7, further comprising: an image acquisition device, disposed above the detection carrier, and capable of collecting data to be processed in a detection accommodation slot of the detection carrier. Detection of color-printed contact lenses for image collection. The device according to claim 8, the device further comprising: an image processing device connected to the image acquisition device via a network, the image processing device being configured to obtain images collected by the image acquisition device. picture And use a preset processing method to process the image to obtain the detection result of the color-printed contact lens to be detected.