225 results about "Image field" patented technology

The invention discloses a sound authenticity identification method based on multi-modal feature deep interactive fusion. According to the method, a double-flow architecture is adopted, and a pre-trained BEATs model and a CNN14 network are respectively utilized to extract Transform sequence features and convolution time-frequency embedding features of an audio; an adaptive MobileFormer fusion device is innovatively proposed, an original MobileFormer structure used in the image field is transformed into a bidirectional cross-modal interaction module suitable for one-dimensional time sequence audio features, dynamic complementary modeling of local details and global semantic features is achieved through a cross attention mechanism, and dynamic nonlinearity is introduced to activate and enhance the expression ability; and the fused enhanced features are input into a hierarchical graph attention network ASSIST, and high-order semantic modeling and authenticity classification are completed by combining spectrogram and time sequence double-flow reasoning. Experimental results show that the performance of the method on an ASVspoof2021LA data set is superior to that of an existing baseline model. The method can effectively detect AI generation voice, replay attack and other forged voice, and is suitable for a voice authentication system.

The invention discloses a multi-feature fusion method for sustainable learning, and the method comprises the steps: determining a plurality of target training pictures in a to-be-learned target image field in a plurality of image fields, and determining a plurality of pieces of target frequency domain feature sub-data of each target training picture; establishing a cross loss function of the image processing model according to a feature fusion process of the plurality of frequency domain feature sub-data in the image processing model; and training the image processing model by taking minimization of the cross loss function as a training target so as to obtain an image processing model which learns a target image field. According to the method, through the synergistic effect of frequency domain feature extraction, double loss function construction and continuous optimization training, the dynamic adaptive capacity and recognition precision of the image processing model in the multi-modal fusion task are improved, and the stability and expansibility of the model are enhanced.

An imaging optic (10) for projection lithography serves to image an object field (5), in which a reticulum to be imaged can be arranged, onto an image field (11), in which a substrate to be exposed can be arranged. The imaging optic (10) has a plurality of mirrors (M1 to M8) for guiding imaging light (16) along an imaging beam path from the object field (5) to the image field (11). The image-side numerical aperture of the imaging optic (10) is greater than 0.75. The optical conductivity of the imaging optic (10) is greater than 45 mm. 2 The result is an imaging optic whose usability for a projection exposure system is improved.

The utility model discloses a shooting device for remote sensing imaging, and relates to the field of remote sensing imaging. The shooting device for remote sensing imaging comprises an unmanned aerial vehicle, a support unit and a shooting unit, the support unit and the shooting unit are arranged below the unmanned aerial vehicle, the support unit comprises a circular sliding rail, a sliding ring and supporting legs, the sliding ring is arranged below the circular sliding rail in a sliding mode, and the supporting legs are fixedly installed below the sliding ring; the shooting unit comprises a driving motor, a connecting frame and a shooting camera, the driving motor is fixedly installed at the bottom of the unmanned aerial vehicle, the connecting frame is connected with the output end of the driving motor and connected with the supporting legs, and the shooting camera is connected with the connecting frame. According to the shooting device for remote sensing imaging, the driving motor fixedly installed at the bottom of the unmanned aerial vehicle drives the connecting frame, the shooting camera and the supporting legs to rotate, so that only the unmanned aerial vehicle needs to hover in the air, when the shooting camera rotates by a shooting angle, the supporting legs do not shield the unmanned aerial vehicle, and the shooting stability and the imaging quality are improved.

An imaging optics for projection lithography has a plurality of mirrors (M8, M9, M10) for imaging an object field in an object plane into an image field (8) in an image plane (9) with imaging light (3) guided along a beam path between the object field and the image field. A penultimate mirror (M9) in the beam path has no passage opening for the imaging light (3). An aperture (19) is arranged in the beam path between the penultimate mirror (M9) and a last mirror (M10) in the beam path. The aperture (19) defines, at least in sections, an edge contour of a pupil of the imaging optics (7) in the beam path between the penultimate mirror (M9) and the last mirror (M10). The aperture (19) is fixed to a component (M10) of the imaging optics via a fastening element (20) which runs at least in sections along the beam path between the penultimate mirror (M9) and the last mirror (M10).In another embodiment of the imaging optics, the aperture is part of a shell component of the imaging optics surrounding the beam path, or is fixed to a shell component of the imaging optics surrounding the beam path, or to a frame component of the imaging optics, or to the second-to-last mirror in the beam path, or to the last mirror in the beam path. In each case, the resulting imaging optics has a well-defined pupil and is optimized for projection lithography.

The invention relates to the technical field of agricultural remote sensing classification, and provides an intelligent field extraction and fusion method for high-resolution satellite images. The method comprises the following steps: step 1, collecting high-resolution satellite images of different areas and preprocessing the high-resolution satellite images to obtain a high-resolution satellite image data set; 2, constructing a high-resolution image field intelligent extraction and fusion network, and training the high-resolution image field intelligent extraction and fusion network by using the high-resolution satellite image data set to obtain a high-resolution image field intelligent extraction and fusion model; wherein the high-resolution image field intelligent extraction fusion network comprises a cultivated land information intelligent extraction module, a cultivated land boundary multi-task deep learning module and an improved mean shift multi-scale segmentation module. According to the method, layered extraction of cultivated land information extraction, cultivated land block boundary determination and crop field block segmentation is carried out in the cultivated land fragmentation area by fusing multiple remote sensing methods, and the refined extraction requirement of precision agriculture can be met.

The invention relates to a multi-modal data construction method based on VLM-LLM cooperative verification and instruction driving, and the method achieves the full-process automation through a VLM and LLM cooperative verification design mechanism, reduces the manual labeling link, and enables the construction efficiency of complex scene data to be improved. Furthermore, through a multi-crossing rechecking mechanism of LLM, the self-error correction capability is established, the error labeling rate is remarkably reduced, and the later correction cost is greatly reduced; by automatically scheduling the expert identity in the LLM, the excellent domain migration capability is realized, the problem of artificial expert dependence is effectively solved, the method can automatically adapt to the new image field, manual intervention is not needed, and the flexibility and adaptability of multi-modal data construction are improved. Compared with a traditional manual labeling scheme and a semi-automatic labeling scheme, the technical disadvantages of insufficient semantic understanding, modal splitting, poor dynamic adaptability and the like are overcome, the manpower disadvantages of high cost, large quality fluctuation, low iteration efficiency and the like are overcome, and a solution is provided for efficiently producing a high-quality multi-modal data set.

The invention relates to a visual scale adaptive unmanned aerial vehicle detection method based on HRRP physical perception, and belongs to the technical field of mobile communication. The method comprises the following steps: constructing a cooperative monitoring architecture of an ISAC base station and a visual sensor, and establishing a space-time mapping relation between a radio frequency sensing coordinate system and a visual sensor coordinate system; performing macroscopic parameter estimation based on echo signals received by the ISAC base station, resolving spatial position coordinates of a target, generating a servo control instruction to drive a visual sensor holder to rotate, and locking the target at the center of a visual image field of view; extracting a frequency domain channel response of the echo signal, generating a time domain HRRP through IDFT, and estimating a radial physical span of a target in combination with a constant false alarm detection algorithm; constructing a self-adaptive image slice model based on physical structure constraint, and performing resampling on slices by using a scale normalization scaling factor; and inputting the normalized image block into the feature fusion detection network to complete fine detection of the unmanned aerial vehicle target.

A method for operating a projection exposure system (1) comprises the following steps: providing a projection exposure system (1) with a radiation source (1) for generating illumination radiation (3), an illumination optic (11) for transferring the illumination radiation (3) from the radiation source (2) to an object field (8) extending in a scan direction (y) and a cross-scan direction (x), wherein the illumination optic (11) has at least one faceted mirror (6, 7) with a plurality of individual mirrors, and wherein at least a subset of the individual mirrors is configured such that they only partially illuminate the object field (8) in the scan direction (y), and a projection optic (10) for imaging a reticle (12) arranged in the object field (8) of the illumination optic (11) onto a wafer (19) arranged in an image field (17) of the projection optic (10), and specifying a set of at least one element of field-dependent aberrations. (Ai(x, y);i=(1..M)), specification of a target vector (Z(x) = (Z1(x), ..., Z; M (x) T ) for the target values ​​Z i (x) of the aberrations Ai(x, y) after averaging over the scan direction (y), dividing the extent of the object field (8) in the scan direction (y) into j ≥ 2 intervals ([y0; y1], ..., [y j-1 ; y j ]) and determining scan weights (gi(x, y)) which characterize a dependence of an illuminance at a location x in the cross-scan direction in the object field () on a position in the scan direction (y) such that a deviation of a weighted aberration vector A weighted ( x ) → : = ∑ gi A l → is reduced from the target vector (Z(x)).

In a projection exposure method for exposing a substrate arranged in the region of an image plane of a projection lens with at least one image of a pattern arranged in the region of an object plane of the projection lens, using radiation from a wavelength range around a design wavelength < 260 nm, a substrate (SUB) is coated with a relatively thick radiation-sensitive photoresist layer (RS) and exposed using a projection lens (PO). This lens produces a focus at a design focus position (FOCO) at the design wavelength and, for other wavelengths outside the wavelength range, offset focus positions from an axially extended focus area (ΔFOC) around the design focus position (FOCO). The projection lens is designed as a single-waisted or double-waisted system.During an exposure time interval, different wavelengths from the wavelength range around the design wavelength are used such that the axial extent of the focus area is at least as large as the layer thickness. The projection lens is optically corrected for chromatic aberration (CHV) such that, in the region of the design wavelength, the image scale is essentially independent of the wavelength, so that a change in wavelength of 1 picometer results in a maximum variation of 2 nm between the position of an image point corresponding to an object point within an image field.

An apparatus for producing incisions in the interior of an eye. In this case, the apparatus contains an image recording device embodied to record at least part of the image field and an image evaluation device embodied to evaluate recordings of the image recording device and produce signals for the control device and / or the operator. Furthermore, a method for producing incisions in the interior of an eye, wherein an image recording device is used to record at least part of the image field and an image evaluation device evaluates the recordings of the image recording device and produces signals for the control device and / or the operator.

The invention discloses an image display method, a construction system and a computing control unit of a head-mounted display, which are applied to the field of images. The first to-be-displayed image is corrected through the pre-correction network model, the visual quality of the image displayed by the first display module is improved, and the defects of geometric distortion, spherical aberration, field curvature and the like of the image seen by a user are reduced, so that the visual fatigue of the user is reduced, and the immersion of VR experience is improved. Moreover, in the process that the user uses the head-mounted display, the training data is collected online in real time, and the pre-correction network model is trained based on the collected training data, so that the training process of the pre-correction network model is simplified, and the training efficiency of the pre-correction network model is improved. And the training data in various actual use scenes can be continuously adopted in an online mode, so that the types of the training data for training the pre-correction network model are enriched, and the accuracy of the pre-correction network model is ensured.

The application discloses a kind of based on multi-modal medical image's lumbar disc herniation postoperative recurrence prediction system, belong to medical image field.Use lumbar image set and each image corresponding feature true value and each patient corresponding recurrence prediction label to carry out training to based on multi-modal image's lumbar disc herniation postoperative recurrence prediction model, in training process, using random gradient descent algorithm to update model parameter, obtain the trained based on multi-modal image's lumbar disc herniation postoperative recurrence prediction model.Through the application, benefit from the rich image features provided by multi-modal image, the prediction network trained based on multi-modal data shows higher accuracy in lumbar disc herniation postoperative recurrence prediction.

According to the medical rotary cutting tool bit assembly, the rotary cutting catheter and the visual blood vessel volume reduction system, the rotary cutting tool bit assembly is provided with a front rotary cutting tool bit and a rear rotary cutting tool bit to conduct rotary cutting operation on blocked blood vessel plaques or thrombus and the like, and the effects of opening blocked blood vessels and enlarging the diameter of a lumen are achieved; a larger blood vessel lumen diameter can be obtained under the condition that surgical instruments do not need to be replaced or repeated rotary cutting is not needed, and the surgical operation steps and time are reduced; meanwhile, by means of an imaging assembly, especially an ultrasonic transmitting and receiving device, instrument positioning in the blood vessel is carried out, a real-time and accurate ultrasonic image view is provided, and the lesion condition can be accurately evaluated; under the scene that a blood vessel guide wire or other surgical instruments cannot effectively penetrate through the occluded lesion, a lesion area can be smoothly reached, and the occluded blood vessel can be opened, so that the operation is safer and more effective.

A magnifying imaging optic (20c) is part of a metrology system for examining objects. The magnifying imaging optic has a maximum of four mirrors (M1 to M4) that image an object field (4) in an object plane (17) into an image field (21) in an image plane (22). Reflecting surfaces of small-area mirrors (M2, M3), which are used to guide imaging light (3) along an imaging beam path, deviate from a spherical shape by a maximum of 10 µm. The result is a magnifying imaging optic that, for a given manufacturing effort, produces an imaging result that meets the strict requirements of a metrology system.

An imaging optics for projection lithography has a plurality of mirrors (M9, M10) for imaging an object field in an object plane into an image field in an image plane with imaging light (3) guided along a beam path between these fields. A penultimate mirror (M9) in the beam path has no aperture for the imaging light (3). In the beam path (3 M9M10 ) between the second to last mirror (M9) and the last mirror (M10) in the beam path, an aperture (19) is arranged. This defines the outer edge contour of a pupil of the imaging optics in the beam path (3 M9M10 ) between the penultimate mirror (M9) and the last mirror (M10) at least in a pupil edge contour section, which is simultaneously in the beam path (3 M10W) between the last mirror in the beam path (M10) and the image field. The result is an imaging optic with a well-defined pupil and optimized for projection lithography.

An imaging EUV optic (10) has a plurality of mirrors (M1 to M6) for guiding imaging light (16) along an imaging beam path from an object field (5) to an image field (11). The imaging optics (10) have a total apodization tilt APO Z3 that is less than 10%. A beam path intersection region (K1, K2, K3) lies between a first partial beam path (M1M2, M2M3) and a second partial beam path (M3M4, M4M5) in the imaging beam path. The first partial beam path (M1M2, M2M3) lies between a mirror (M1, M2) and a mirror (M2, M3) directly following this mirror in the imaging beam path. The second partial beam path (M3M4, M4M5) lies between another mirror (M3M4) and a mirror (M4M5) directly following this further mirror in the imaging beam path. An object-image offset (d) OIS) is greater than 250 mm. This results in an imaging EUV optic whose usability for an EUV projection exposure system is improved.

An OCT system for the retina (4) comprises: an illumination unit (36) providing SS-OCT source radiation, an illumination beam path leading to the object (4) and a measurement beam path coming from the object (4) to a detector (38) having pixels (74), wherein the measurement beam path is coupled out via a splitter element (42), a filter element (48) following the splitter element (42) which makes the numerical aperture of the image larger in a first direction (x) than in a second direction (y) lying transversely thereto, and a coupling device (52, 66) for coupling in the reference radiation (R) in the pupil and outside the optical axis (6), so that the reference radiation (R) is superimposed on the detector (38) with the measurement radiation (M) at an angle, wherein the control device (58) reads out pixels (74) of the detector (38) which correspond to a line-shaped area in the image field (22) correspond,which has a line length along the first direction (x) and a line height along the second direction (y), and the control device (58) realizes an image field (22) that is higher than the line height by moving the line-shaped region over the object (2) along the line height, wherein a depth resolution of the generated 3D image is determined by the spectral range and spectral bandwidth of the tuning, and a lateral resolution of the 3D image is determined by the numerical aperture in the line direction and by the line height.

An imaging optic (23) serves to image an object field arranged in an object plane, in which a lithography mask can be arranged as the object to be imaged, with imaging light via an imaging beam path into an image field arranged in an image plane, in which a substrate onto which the image is to be formed can be arranged. The imaging optic (23) has at least one correction device (32). This device has a correction element (30) arranged in the imaging beam path, the imaging effect of which varies across the image field. Furthermore, the correction device (32) has a correction element holder (33) and a correction element drive unit (34). The correction element holder (33) is driven by the correction element drive unit (34) during an imaging phase of the imaging optic (23) and can be displaced along a correction element displacement direction (35) extending transversely to the imaging beam path.The result is an imaging optic whose imaging effect is improved to achieve a predetermined imaging result.

The invention relates to a microscope with an imaging beam path comprising an objective (4) and imaging a sample (2) from an image field onto a two-dimensional detector (8), and an illumination beam path (B) illuminating the sample (2) through the objective (4), which illumination beam path comprises a light source and is reflected into the imaging beam path (M) via a beam splitter (6) in front of the objective (4), and a measuring device (10) followed by a light modulator (16) comprising at least one intensity-modulating, first line grating structure (26-29), wherein the light modulator (16) is arranged obliquely to a plane conjugate to the focal plane of the objective (4) and is projected onto the sample (2) through the illumination beam path (B) and the objective (4), wherein the at least one intensity-modulating, first line grating structure (26-29) is projected into a measuring area of ​​the sample (2) that only partially fills the image field,and the measuring device (10) has a processor (32) which reads out image data supplied by the detector (8) and divides these into measurement data and display data for displaying a sample image based on a position in the image field, wherein the processor (32) selects as measurement data those image data which correspond to the measurement area of ​​the sample (2) and evaluates the measurement data with regard to reflection images of the at least one line grating structure (26-29) projected onto the sample (2).

The invention relates to a remote sensing image reverse editing method for a diffusion model, and belongs to the field of computer vision. The strong generation and editing capability of the diffusion model brings a series of potential safety hazards, and the image reverse editing technology aims at adding a layer of protective noise to an image, so that the diffusion model is difficult to output an ideal editing result. In order to solve the problems that an existing anti-editing technology is poor in effect on a remote sensing image and generally faces low efficiency and obvious protection traces, the invention provides an efficient and hidden protection scheme which comprises the following three steps: step 1, generating anti-editing disturbance based on hidden space high-frequency component suppression; step 2, noise generation network training based on single-time forward transmission; and step 3, concealment enhancement based on noise perception graph constraint. The method can effectively resist malicious image editing based on a diffusion model, is suitable for the field of remote sensing images, and gives consideration to safety, efficiency and image quality.

Method for generating an overview image using a high-aperture lens (4) with the steps: - Providing an optical detection beam path (2) with the objective (4), wherein the detection beam path (2) in a first operating state has a first numerical aperture (NA1) and a first depth of field (ST1) which lies substantially in a focal plane of the detection beam path (2), and in the first operating state an image of a detection radiation with the first depth of field (ST1) and with a lateral image field is or can be detected, wherein the detection radiation is effected by directing at least one light sheet (16) along an illumination axis (15) into a sample volume (8) to be imaged located in the sample space; - transferring the detection beam path (2) into a second operating state by increasing the first depth of field (ST1) to a second depth of field (ST2), wherein the high-aperture lens (4) remains in the detection beam path (2), - adjusting a thickness of the light sheet (16) in the direction of a detection axis (3) of the lens (4) to the second depth of field (ST2) using an adjustable illumination device, so that the thickness of the light sheet (16) corresponds at least to the second depth of field (ST2); - in the second operating state, detecting a detection radiation, wherein the detection radiation coming from a sample space is collected by means of the objective (4), guided along the detection beam path (2) and detected as an image with a lateral image field by means of at least one detector (7) sensitive to the detection radiation, wherein the lateral image fields are the same in the first and second operating states.

An imaging EUV optical unit serves for imaging an object field into an image field. The imaging optical unit has a plurality of mirrors for guiding EUV imaging light at a wavelength of shorter than 30 nm along an imaging beam path. The imaging EUV optical unit has an image-side numerical aperture of at least 0.3. An overall transmission of the plurality of mirrors is greater than 10%. An overall mirror surface, which represents the sum of all used mirror surfaces of the plurality of mirrors, is less than 1.5 m2. This design can yield an imaging EUV optical unit with improved usability for an EUV projection exposure apparatus.

The invention discloses an image splicing method and device, mobile equipment, a storage medium and a product. The method comprises the following steps: acquiring pose information of a preset number of fisheye cameras in a world coordinate system and fisheye images shot by the preset number of fisheye cameras; converting a first pixel point on the target image into a world coordinate system according to preset target image view information and target image size information, and obtaining a first space point of the first pixel point in the world coordinate system; converting the first spatial point into a camera coordinate system according to the pose information to obtain a second spatial point; converting the second spatial point into the fisheye image by using the internal reference of the ideal camera and the corresponding relationship between the ideal image and the fisheye image to obtain a second pixel point; and according to a mapping relation between the first pixel points and the second pixel points, splicing the fisheye images to obtain a target image. According to the image splicing method provided by the invention, the calculation amount is saved, the splicing process is simplified, and the splicing effect is improved.

Collected light may be split into fields using grazing incidence mirrors to avoid illuminating gaps between the active areas for readout electronics. The grazing incidence mirrors may reduce lost field space in the integrating direction by splitting the imaging field in that direction to allow the readout electronics to be outside of the field. The fields may be split so there is space for readout circuits but no associated light on the readout circuits. The size of the illumination may then be decreased and / or the number and / or size of sensors increased to improve the photon collection efficiency. The better photon collection efficiency may reduce shot noise and / or improves tool throughput.

The application discloses a kind of low field intensity magnetic susceptibility weighted imaging optimization method and system, it is related to magnetic susceptibility weighted imaging field, comprising: obtaining the K space original data obtained by scanning target object;According to K space original data reconstruction image field data, extract the amplitude data and phase data of image field data;Phase data is preliminary unwrapping processing, and unwrapping phase data is obtained;Unwrapping phase data is separated from background field, and local phase diagram is obtained;Local phase diagram and amplitude data are operated based on complex domain phase separation high-pass filter, and high-frequency phase data is obtained;According to high-frequency phase data and amplitude data, the reconstruction of magnetic susceptibility weighted image is carried out, and the magnetic susceptibility weighted image of target object is obtained.The application can significantly reduce the phase artifact of SWI image, and improve the definition of image detail.

The application discloses a kind of identification methods for human disturbance land, it is related to remote sensing image field, the method is by in edge computing terminal to the unified geometric orthographic correction of remote sensing image sequence, radiation normalization, cloud mask processing and format conversion, construct standardization image set, effectively improve the time series comparability and spectral consistency between remote sensing image, solve multi-temporal image illumination difference, geographical deviation and cloud interference and other influencing factors, provide high-quality input data basis for subsequent disturbance feature extraction;Meanwhile, the application combines air port identification algorithm, mechanical activity path detection and construction boundary expansion identification technology, comprehensively extracts ventilation corridor area, dynamic expansion area and mechanical disturbance area, constructs sensitive disturbance sampling point space layout scheme for disturbance potential, significantly improves the perception coverage ability and detection efficiency to key area, reduces redundant computing resource consumption, improves system real-time processing capability and early identification precision.

The application discloses a kind of optical lens optical axis angle determination method, device, equipment and medium, the optical axis angle determination method first provides a test chart;Test chart is by checkerboard and a plurality of target test patterns inlaying into;Then the image information of each target test pattern is collected by optical lens, and the position of corresponding optical lens and / or image sensor is moved, so that the image field of optical lens is parallel to the imaging surface of image sensor, and the line of the optical center of optical lens and the image center of image sensor is perpendicular to the imaging surface of image sensor;Then the distortion center of optical lens is identified by the corner point position information of checkerboard;The line of the optical center of optical lens and the distortion center of optical lens is parallel to the optical axis of optical lens;Finally, according to the position of the optical center of optical lens, the position of the image center of image sensor and the position of the distortion center of optical lens, the inclination of the optical axis of optical lens relative to the image field of optical lens is determined.

The invention belongs to the image field, the voice field and the digital human technology field, and especially relates to a digital human generation method based on multiple modes. The method comprises the following steps: firstly, obtaining audio videos of people with different images under the same text, separating the audio videos, and extracting facial features to construct a data set; building and training a digital human image clone model and a tone clone model, and respectively realizing mapping from audio to facial features and mapping from the facial features to silent video and tone clone; and finally, integrating the two models, and realizing digital human question and answer communication by means of driving of a large language model. Compared with a traditional single-modal generation technology, the method solves the problems that the appearance and tone of the virtual human are inconsistent and the emotion expression is inaccurate through multi-modal data fusion, improves the sense of reality and naturalness of the digital human, enhances the expressive force of the digital human in scenes such as a virtual anchor and intelligent customer service, and promotes the development of the digital human technology.

An imaging optical unit for projection lithography has a plurality of mirrors (M9, M10) for imaging an object field in an object plane into an image field in an image plane with imaging light (3) guided along a beam path between these fields. A penultimate mirror (M9) in the beam path has no passage opening for the imaging light (3). A stop (19) is arranged in the beam path (3M9M10) between the penultimate mirror (M9) in the beam path and a last mirror (M10) in the beam path. It specifies an outer edge contour of a pupil of the imaging optical unit in the beam path (3M9M10) between the penultimate mirror (M9) and the last mirror (M10), at least in one pupil edge contour portion located in the beam path (3M10W) between the last mirror (M10) in the beam path and the image field at the same time. In one embodiment of the imaging optical unit, the stop is fastened to a component of the imaging optical unit by way of a securing element which at least in portions extends along the beam path between the penultimate mirror and the last mirror. In a further embodiment of the imaging optical unit, the stop is part of an enveloping component of the imaging optical unit surrounding the beam path or is fastened to an enveloping component of the imaging optical unit surrounding the beam path or to a frame component of the imaging optical unit or to the penultimate mirror in the beam path or to the last mirror in the beam path. This results in each case in an imaging optical unit that is well defined with regard to its pupil and is optimized for projection lithography.