Image edge enhancement imaging device

Abstract

The utility model relates to an image edge enhancement imaging device, and belongs to the field of imaging and optical fiber devices. The device comprises an optical 4f system, a spiral phase plate and an optical fiber bundle, wherein the optical 4f system comprises a lens L1 and a lens L2; the spiral phase plate is positioned on a frequency spectrum surface of the optical 4f system; the front end of the optical fiber bundle is located on the rear focal plane of the lens L2, an optical fiber bundle array is adopted for guiding light of an output edge enhanced imaging light field signal, and a photoelectric detector is used for receiving an image. The device provided by the utility model realizes the integration of miniaturization and functionalization of an optical imaging system. A solution with an edge enhancement function, higher processing efficiency and wide scene applicability is provided for image edge enhancement imaging, and the method has important engineering application value in the fields of biomedicine, industrial detection, intelligent perception and the like.

Description

Technical Field

[0001] This utility model belongs to the field of imaging and fiber optic devices, and relates to an image edge enhancement imaging device. Background Technology

[0002] Optical imaging technology, as an important interdisciplinary field of modern optics and information science, plays a crucial role in applications such as biological microscopic inspection, industrial machine vision, and optical information security. In traditional image processing workflows, edge feature extraction of target objects typically relies on backend digital image processing algorithms. These methods require high-performance computing hardware and suffer from significant time delays, making it difficult to meet the real-time processing requirements of industrial online inspection.

[0003] In existing technologies, the 4f optical system, as a classic optical information processing architecture, achieves dual transformation from the object plane to the spectral plane and then to the image plane through Fourier lens groups, and can perform image edge enhancement processing by combining spatial filters. This purely optical processing method can achieve feature extraction without digital computation, significantly reducing the amount of data processed in the backend and having an inherent advantage in improving processing speed. However, traditional 4f systems are built with discrete lens groups, requiring precise adjustment of the coaxial spacing of the two Fourier lenses and precise positioning of the spatial filter, resulting in a large system size, complex optical path adjustment, and poor stability. In addition, the architecture based on spatial light field transmission is difficult to integrate effectively with planar detectors such as CMOS, which restricts its application in miniaturized detection devices.

[0004] The current industrial inspection field urgently needs an optical system solution that combines high-speed edge enhancement processing capabilities with a compact structure. While maintaining the advantages of real-time optical processing, it should break through the application bottlenecks of traditional 4F systems, which are bulky and complex to assemble, in order to meet the urgent needs of intelligent manufacturing equipment for embedded optical inspection modules. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide an image edge enhancement imaging device, which integrates an optical 4f system based on helical phase filter modulation onto the end face of an optical fiber bundle using 3D printing technology, which can greatly reduce the size of the device, improve stability, and at the same time maintain the optical edge enhancement imaging effect.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An image edge enhancement imaging device includes an optical 4f system, a spiral phase plate, and an optical fiber bundle; the spiral phase plate is located on the spectral plane of the optical 4f system; the front end of the optical fiber bundle is located at the back focal plane of the optical 4f system.

[0008] Preferably, the optical 4f system includes lens L1 and lens L2; ​​the spiral phase plate is located between lens L1 and lens L2.

[0009] Preferably, the front end of the fiber bundle is located at the rear focal plane of the lens L2, and the fiber bundle array is used to guide the output edge-enhanced imaging light field signal.

[0010] Preferably, the discrete components in the optical 4f system are fixed together by a cylindrical embedded integrated bracket and connected to the front end of the fiber bundle.

[0011] Preferably, the optical 4f system, the spiral phase plate, and the fiber bundle are fixed by an external fixing support rod.

[0012] Preferably, the peripheral fixed support rod is one or more rods.

[0013] Preferably, the spiral phase plate has different topological charges.

[0014] Preferably, the fiber bundle uses a fiber bundle array to guide the output edge-enhanced imaging light field signal and uses a photodetector to receive the image.

[0015] Preferably, the optical 4f system and the spiral phase plate are integrated into the end face of the fiber bundle using a 3D printing process.

[0016] The beneficial effects of this invention are as follows: At the structural design level, this solution combines micro-nano 3D printing technology with traditional optical system design, successfully integrating the optical 4f system into the fiber optic bundle end face. In terms of functional implementation, at the spectral plane of the 4f system, spiral phase plates with different topological charges are introduced to perform spectral filtering on the input image, achieving enhanced edge controllability imaging of the target object in a specific direction. Regarding system integration, this solution uses a fiber optic bundle array to receive the processed optical information and a photodetector to receive the image, realizing the miniaturization and functional integration of the optical imaging system.

[0017] In summary, this solution provides an image edge enhancement imaging approach that features edge enhancement capabilities, higher processing efficiency, and wider applicability across various scenarios. It holds significant engineering application value in fields such as biomedicine, industrial inspection, and intelligent sensing. Specific engineering applications include: in industrial inspection, it can be used for online monitoring of microcracks in aero-engine blades, enabling high-speed scanning detection; in biomedicine, it can be coupled with two-photon microscopy to achieve in vivo dynamic observation of cortical neural synapses.

[0018] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0020] Figure 1 A schematic diagram of an image edge enhancement imaging device provided in an embodiment of this utility model;

[0021] Figure 2 This is a schematic diagram of a spiral phase filter structure. Detailed Implementation

[0022] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0024] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0025] Example 1:

[0026] Please see Figures 1-2 This embodiment provides a novel image edge enhancement imaging device, such as... Figure 1 As shown, the device includes an optical 4f system, a spiral phase plate, and an optical fiber bundle, wherein the optical 4f system includes lens L1 and lens L2.

[0027] The fabrication process of this device is as follows: First, a spiral phase filter-based optical 4f system is 3D micro-nano-printed and integrated into the end face of the fiber bundle. The spiral phase plate is placed on the spectral plane of the optical 4f system, and edge-selective enhancement of the image can be achieved by adjusting its topological charge (which can be an integer or a fraction). The fiber bundle front end (i.e....) Figure 1 The image plane (in the image) is located at the back focal plane of lens L2. An optical fiber bundle array is used to guide the output edge-enhanced imaging light field signal, and a photodetector (such as a CCD lamp) is used to receive the image.

[0028] This device can simultaneously enhance the imaging of the edges of objects of arbitrary shapes in any direction. It has the advantage of small size and breaks through the limitations of traditional software methods and edge enhancement imaging based on spatial light field. At the same time, since it is based on direct imaging of optical systems, the amount of back-end digital processing data is reduced, and the image processing speed of the device can also be greatly improved.

[0029] The spiral phase plate performs spectral filtering on the input image through its own radial Hilbert transform filtering function. Its working principle is as follows:

[0030] The spiral phase plate, also known as the spiral phase filter or radial Hilbert transform filter, has a phase function of exp[ilθ], where l is the topological charge and θ is the azimuth angle. Its structure is as follows: Figure 2 As shown. Therefore, along any diameter direction, it is equivalent to a one-dimensional Hilbert transform, which can be used to uniformly enhance edges along arbitrary orientations. When l is a fraction, orientation-enhanced imaging effects in a specific direction can be achieved.

[0031] Assuming the incident field (target object light field signal) function graph is g(x), its Fourier spectrum in a 4f optical system can be obtained as G(u), where u is the spatial frequency variable. A spiral phase filter H(u) = exp[ilθ] is placed on the focal plane of lens L1. The product of the input object spectrum and the filter function, G(u)H(u), is Fourier transformed by lens L2 to obtain the output function. It can be represented as the convolution of the input matter function g(x) and the spiral phase function h(x):

[0032]

[0033] Here, h(x) is the Fourier transform function of the spiral phase filter function H(u), and * represents the convolution operation of the two functions. By adjusting the sign and amplitude of l, the directional sensitivity and intensity of the operation can be controlled.

[0034] Example 2: As a preferred embodiment, the discrete components of the micro-optical 4f optical system based on spiral phase filtering at the front end are fixed together by a designed cylindrical embedded integrated bracket during the 3D printing process and connected to the front end of the fiber bundle.

[0035] Example 3: As a preferred embodiment, in order to further enhance the entire edge enhancement imaging system, this embodiment also sets up multiple peripheral fixing rods to enhance the robustness of the system in practical applications.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An image edge enhancement imaging device, characterized in that, The device includes an optical 4f system, a spiral phase plate, and an optical fiber bundle; the spiral phase plate is located on the spectral plane of the optical 4f system; the front end of the optical fiber bundle is located at the back focal plane of the optical 4f system.

2. The image edge enhancement imaging device according to claim 1, characterized in that, The optical 4f system includes lens L1 and lens L2; ​​the spiral phase plate is located between lens L1 and lens L2.

3. The image edge enhancement imaging device according to claim 2, characterized in that, The front end of the fiber bundle is located at the back focal plane of lens L2, and the fiber bundle array is used to guide the output edge-enhanced imaging light field signal.

4. The image edge enhancement imaging device according to claim 1, characterized in that, The discrete components in the optical 4f system are fixed together by an embedded integrated bracket and connected to the front end of the fiber bundle.

5. The image edge enhancement imaging device according to claim 4, characterized in that, The embedded integrated bracket is cylindrical.

6. The image edge enhancement imaging device according to claim 1, 4, or 5, characterized in that, The optical 4f system, spiral phase plate, and fiber bundle are fixed by an external fixing support.

7. The image edge enhancement imaging device according to claim 6, characterized in that, The external fixed support rods can be one or more.

8. The image edge enhancement imaging device according to claim 1, characterized in that, The spiral phase plate has different topological charges.

9. The image edge enhancement imaging device according to claim 1, characterized in that, The fiber bundle uses a fiber bundle array to guide the output edge-enhanced imaging light field signal and uses a photodetector to receive the image.

10. The image edge enhancement imaging device according to claim 1, characterized in that, The optical 4f system and the spiral phase plate are integrated onto the end face of the fiber bundle using a 3D printing process.

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