6 results about "Vignetting" patented technology

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.

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.

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.

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.