15 results about "Vignetting" patented technology

The invention provides an objective lens system and optical observation equipment. The objective lens system comprises a fourth lens with positive focal power, a third lens with positive focal power, a second lens with negative focal power and a first lens with positive focal power which are sequentially arranged on the same optical axis from the object side; the first lens and the third lens are biconvex lenses, the second lens is a biconcave lens, the fourth lens is a balsaming lens, and the image side surface of the fourth lens is a convex surface; the focal length f of the objective lens system and the focal length f1 of the first lens satisfy the relationship. According to the invention, during assembly, the tolerance requirement is low, installation and adjustment are more facilitated, the field of view is larger, the vignetting is smaller, the number of lenses is smaller, and the cost performance is higher.

The application discloses a kind of human eye test conoscopy, comprising: front light barrier, the light aperture of the light barrier is not more than 4mm;Imaging lens group, close to object plane, with positive focal length, can be not less than 120 degree field of view incident light rays converge into, and form approximate telecentric intermediate image in rear;Relay lens group, close to image plane, with less than 1 magnification, for imaging intermediate image at image plane;The focal length GF1 of the imaging lens group is less than 16.2mm, the focal length GF1 of imaging lens group and the focal length GF2 of relay lens group satisfy the following relationship: 0.2<GF1 / GF2<0.3;Imaging circle diameter is D1, and the diameter of diaphragm is D2, satisfy: 8<D1 / D2<10.The above-mentioned human eye test conoscopy can realize similar test effect with direct observation of human eye, suitable for testing near-eye display device, and can meet the imaging effect of large image plane, high resolution and no vignetting.

Method for controlling a microscope with a zoom optic for continuously adjusting the magnification by the motorized displacement of at least one first optical element of the zoom optic along an optical axis relative to at least one second optical element of the zoom optic, and with an objective turret (2) with at least two objectives (3, 4) of different magnifications, wherein when switching to an objective (3, 4) with a higher or higher magnificationAt a lower magnification, at least one first optical element is shifted by a path length determined on the basis of the objective data and the data of the zoom optics until the same magnification is set for an observer as before the switching, characterized in that, for a given magnification, it is determined on the basis of the objective data for which of the objectives (3, 4) a maximum aperture and / or a maximum depth of field and / or a minimum vignetting is achieved at this magnification, this is signaled to an observer and a change of objective is suggested, and when the suggested objective (3, 4) is selected, the given magnification is set.

The utility model relates to an optical lens with high efficiency and high central field-of-view image resolution and a light-emitting assembly. The optical lens comprises a first lens, a second lens, a third lens, a fourth lens and an image surface which are arranged in sequence, the surfaces of the first lens, the second lens and the third lens are aspheric surfaces, and the Abbe coefficient of the second lens is lower than that of the other three lenses; the first surface and the second surface of the second lens are bent towards one side far away from the image surface; the vignetting diaphragm is arranged on the first surface, far away from the image surface, of the fourth lens; and the aperture diaphragm is arranged on the first surface or the second surface of the first lens, and the distance between the aperture diaphragm and the vignetting diaphragm is 23-50 mm. The lighting efficiency is high; the surfaces of the first lens, the second lens and the third lens are aspheric surfaces, so that the transverse chromatic aberration is optimized, and the abbe coefficients of the other three lenses are higher than that of the second lens, so that the overall transverse chromatic aberration is reduced; by setting the distance between the aperture diaphragm and the vignetting diaphragm, the imaging quality of the central view field can be improved.

This application relates to a method and apparatus for joint correction of display screen viewing angle and camera vignetting, belonging to the field of display screen brightness measurement technology. The method includes the following steps: acquiring grayscale images of the same first display screen from different preset viewing angles using the same camera to obtain a measurement brightness matrix of multiple original images; calculating the coordinates of each pixel in each original image and the shooting angle parameters through pixel positioning to obtain a corresponding shooting parameter matrix; obtaining a screen viewing angle model and a camera vignetting model based on the measurement brightness matrix and the shooting parameter matrix; and calibrating the brightness of the display screen under test based on the screen viewing angle model and the camera vignetting model. This application simplifies the calibration process of the screen viewing angle model and the camera vignetting model, reducing the dependence on specific optical instruments during calibration, thus meeting the requirements for joint correction of display screen viewing angle and camera vignetting.

The application provides an optical observation device, which comprises, in sequence from the object side to the same optical axis, an objective lens system, a relay lens system and a magnifying lens system, and parallel light paths are formed among the objective lens system, the relay lens system and the magnifying lens system; the objective lens system comprises, in sequence from the object side to the same optical axis, a first double cemented lens, a first double convex lens, a first double concave lens and a second double convex lens; the relay lens system comprises at least one relay lens group, and the relay lens group comprises two three-cemented rod lenses which are arranged in optical property symmetry; and the magnifying lens system comprises, in sequence from the object side to the same optical axis, a second double cemented lens, a second double concave lens and a fourth double meniscus lens. According to the application, the difficulty of assembly and adjustment is reduced, the field of view is larger, the vignetting is smaller, the number of lenses is smaller, and the cost performance is higher under the condition that the overall size is unchanged.

The utility model relates to an optical lens with high efficiency and high image quality resolution, a light-emitting assembly and a vehicle. The optical lens comprises a first lens, a second lens, a third lens, a fourth lens and an image surface which are arranged in sequence, wherein the first lens, the third lens and the fourth lens have positive focal power, and the second lens has negative focal power; the Abbe coefficient of the second lens is lower than that of the other three lenses; the first surface and the second surface of the second lens are bent towards one side far away from the image surface; the aperture diaphragm is arranged on the second lens or between the second lens and the object plane; and the vignetting diaphragm is arranged on the third lens or the fourth lens or between the third lens and the fourth lens. In the embodiment, the aperture diaphragm can limit the clear aperture of the system, so that the illumination efficiency is high; a vignetting diaphragm arranged on the third lens or the fourth lens or between the third lens and the fourth lens improves the image quality by limiting the clear aperture of the large view field; and the optical aberration of the system is corrected and optimized by combining four lenses.

To provide a shading correction method that prevents image degradation even when lens vignetting occurs.SOLUTION: A shading correction method for correcting aberrations in captured image data corrects image data captured by an imaging device in which a compatible sensor size of the condenser lens is smaller than the light-receiving surface of the image sensor, causing lens vignetting. First, correction parameters for shading correction are calculated while excluding detection areas where there is no incident light due to lens vignetting. Then, shading correction is performed on the basis of the calculated correction parameters. At this time, the presence or absence of incident light is determined on the basis of a threshold value of the video level in the image data.SELECTED DRAWING: Figure 3

The utility model provides a microscope tube lens and a microscope. The microscope tube lens comprises a first lens group, a second lens group and a third lens group which are sequentially arranged on the same optical axis from an object side to an image side; the first lens group, the second lens group and the third lens group respectively comprise at least two lenses, and the refractive indexes of the at least two lenses in each lens group are different; the surface of the first lens group facing the object side is convex, and the surface of the first lens group facing the image side is concave. The surface of the second lens group facing the object side is concave, and the surface of the second lens group facing the image side is convex. The surface of the third lens group facing the object side is concave, and the surface of the third lens group facing the image side is convex. According to the technical scheme of the utility model, the specific parameters and structures of the lenses are set, so that the image space field of view of the microscope tube lens is 40.272 mm, the focal length of the microscope tube lens is 200 mm, the imaging quality and the image space field of view are improved, and the overall performance of the microscope is further improved. Aberration correction is good, and vignetting is avoided; the self-design is realized, and the problem that the existing tube lens cannot be well matched with semiconductor measurement equipment is solved.

The application provides an infinity-corrected microscope objective and a microscope. The infinity-corrected microscope objective comprises a first lens, a first lens group, a second lens group and a sixth lens arranged in sequence from an object side to an image side along an optical axis. According to the scheme, the specific parameters and structures of the lenses are set, so that the magnification of the infinity-corrected microscope objective is 5 times, the object field of view is 8 mm, the tube lens with a focal length of 200 mm can be used, the working distance is 30.12 mm, the corresponding numerical aperture is 0.12, the object field of view and the working distance of the infinity-corrected microscope objective can be improved, and the overall performance of the microscope is improved; while the field of view is improved, the infinity-corrected effective aperture is optimized, the vignetting can be greatly reduced, and the imaging effect is improved; the resolution at the large field of view is high; and the independent design is completely realized, and the problem that the existing 5 times objective lens cannot meet many use requirements in optical detection is solved.

In a method for reducing an image vignetting, a microscope image is captured by means of a microscope, wherein the microscope image exhibits a vignetting. At least the microscope image is input into an image processing model which has been trained, by means of training data comprising input images with vignetting and associated target images without vignetting, to calculate a vignetting-free microscope image from at least the input microscope image. The method further comprises the outputting of a calculated vignetting-free microscope image by the image processing model.

The application provides a catadioptric co-caliber three-grade zoom optical system, which can eliminate the vignetting of a transmission zoom system, compress the structure size of a long focal length, and improve the target energy collection capacity by using a large caliber. The optical system realizes three-grade zoom of a Cassegrain primary mirror as a diaphragm, eliminates the vignetting of the transmission zoom system, compresses the structure size of the long focal length, and improves the target energy collection capacity by using the large caliber. Even in low-illumination weather conditions, the target surface illumination can be ensured, and a high target surface irradiance can still be realized in the long focal length mode. The co-caliber zoom structure integrates a part of the long focal length mode of continuous zoom, so that the structure of a small focal length and large field of view zoom system used in cooperation is more compact, and the weight and space pressure of the overall load are reduced. Meanwhile, the three-grade zoom structure can realize rapid switching of the focal length, and eliminates the zoom delay in the continuous zoom case.

The application relates to an optimization method of a Fourier ptychographic imaging illumination system, comprising the following steps: determining that vignetting does not exist in an image collected by the Fourier ptychographic imaging illumination system, and the collected image comprises multiple bright-field images; and the optimal value of the center distance between object plane fields when adjacent light source units in an illumination device are lighted; according to the optimal value of the center distance between object plane fields when the adjacent light source units are lighted, adjusting the positions of part of the light source units in the illumination device or the distances between part of the light source units and a sample, so as to eliminate the vignetting. The application avoids the influence of vignetting on the basis of the original system structure, and no redundant hardware is added; the means that the FPM experiment must rely on GPU to block and parallelly process the collected large-field pictures due to the vignetting phenomenon is avoided, the cost of the system is greatly reduced, and the data recovery efficiency is improved.

The application provides an objective lens system and an optical observation device. The objective lens system comprises, in order from an object side, a fourth lens with positive refractive power, a third lens with positive refractive power, a second lens with negative refractive power, and a first lens with positive refractive power. The first lens and the third lens are both double convex lenses, the second lens is a double concave lens, the fourth lens is a cemented lens, and the image side surface of the fourth lens is a convex surface. The focal length f of the objective lens system and the focal length f1 of the first lens satisfy f / f1>1. Through the application, the tolerance requirement is low during assembly, the assembly and adjustment are more convenient, the field of view is larger, the vignetting is smaller, the number of lenses is smaller, and the cost performance is higher.

This application provides an image processing method, an image processing apparatus, and a storage medium, aiming to improve the efficiency of image vignetting processing while ensuring good vignetting processing results. The image processing method provided in this application includes: acquiring an image to be processed and vignetting intensity parameters; determining a target region from the vignetting addition region; determining the brightness reduction value of each pixel in the target region using the vignetting intensity parameters and a random amount of vignetting intensity in the target region; and adjusting the brightness value of each pixel in the vignetting addition region using the brightness reduction values ​​of each pixel in the target region. In the above implementation, a random amount of vignetting intensity is introduced when processing the vignetting of the image to be processed, improving the vignetting processing effect; and when processing the vignetting of the image to be processed, only the brightness reduction value of the target region needs to be calculated, without needing to calculate the brightness reduction value of each pixel in the vignetting addition region, thus improving the efficiency of image vignetting processing.