1237results about How to "Guaranteed image quality" patented technology

The invention discloses a method for achieving user authentication by utilizing a camera. The method comprises the following steps: (1) pre-collecting and storing a facial image of a user, (2) performing vivo detection on a facial image of a current user through the camera in the field use process, executing the step (3) if the detection succeeds, and prompting that the detection fails if not, (3) performing field photographing on the current user through the camera and performing storing, (4) comparing the stored facial image of the user with the pre-collected facial image of the user to obtain the degree of similarity, and (5) comparing the degree of similarity and a preset threshold value and determining whether the two compared facial images belong to the same person, wherein it is determined that the two compared facial images belong to the same person if the degree of similarity is greater than or equal to the preset threshold value, and the authentication cannot be passed if the degree of similarity is smaller than the preset threshold value. According to the method for achieving the user authentication by utilizing the camera, because dual detection is performed through a facial recognition system and the vivo detection, the situation of easily invading the system can be effectively controlled, and the security of user data is promoted.

The invention discloses a splicing device for a real-time high speed high definition panoramic video and a method thereof. The method comprises the steps: S10, obtaining spliced multipath real-time video sequences; S20, judging whether video images at the same moment in any two paths of video sequences meet the image splicing condition; S30, calculating an image splicing parameter; S40, selecting a projection face and mapping the video images in the multipath real-time video sequences to the same mapping face according to the splicing parameter, then determining the panoramic projection face; S50, establishing a mapping table of pixel points on the video images and coordinate points of the overall projection face; S60, conducting exposure and fusion processing on pixel values of all the coordinate points on the panoramic projection face and outputting the panoramic video images according to the pixel values. The splicing device for the real-time high speed high definition panoramic video and the method of the splicing device can greatly improve splicing efficiency of the images, ensure output quality of the images, and meet the requirement for real-time high speed high definition panoramic video.

The present invention provides a method for evaluating compression quality of satellite-loading optical remote sensing image. The method comprises the following steps: obtaining an analog original image; obtaining the image which is decompressed after compression; respectively analyzing the dynamic range of analog original image and dynamic range of compressed image; respectively analyzing the texture detail of analog original image and texture detail of compressed image; analyzing the application effect of compression to image; analyzing the interrelationship between the analog original picture and compressed image; and evaluating the compression quality of image after synthesizing each item of analytical result to analog original image and compressed image. The invention aims at the characteristic of satellite sensor for generating analog image, adopts a comprehensive method which mainly uses objective evaluation and uses subjective evaluation in auxiliary for evaluating compression quality of image fully, systemtically and purposely. A whole system for evaluating the compression quality of satellite-loading optical remote sensing image is constructed.

The embodiment of the invention discloses a photographing method which is applied to a mobile terminal. The method comprises the steps that a photographing instruction is acquired; the photographing instruction is performed, and the light intensity value of the scene to be photographed by the mobile terminal is measured based on the preset exposure parameter; a first exposure parameter and a second exposure parameter corresponding to the light intensity value are determined according to the preset strategy, wherein the second exposure parameter is different from the first exposure parameter; image acquisition is performed based on the first exposure parameter so as to acquire a preview image, and the preview image is previewed; and photographing is performed based on the second exposure parameter after previewing of the preview image is completed. The embodiment of the invention also discloses photographing equipment and a computer readable storage medium.

The invention relates to a device for carrying out the nondestructive optical constant imaging of a human body cutis pathologic tissue and a method thereof. The device comprises a tungsten halogen lamp, an incident fiber optic probe, a line array CCD for receiving diffused reflection light, and a grating spectrograph, an amplification filter circuit, an A/D conversion circuit, a computer and a computer-controlled three-dimensional traveling table which are connected in turn through an optical fiber. The invention uses the line array CCD optical measurement device detecting the obliquely incident diffused reflection light to detect the human body cutis tissue, uses a Monte Carlo statistical method limited by characteristic parameters to conversely compute the values of the absorption coefficient and the reduction scattering coefficient at each two-dimensional space coordinates of the detected cutis tissue, then uses the grating spectrograph to carry out spectrum, and respectively images through the absorption coefficient and the reduction scattering coefficient and simultaneously detects the detected human body pathologic tissue and a healthful tissue around the pathologic tissue. Then the optical constants of the pathologic tissue and the healthful tissue are compared to see difference or the optical constant of the pathologic tissue is compared with a healthful human body tissue sample, thereby carrying out the diagnosis and identification of diseases.

The invention discloses a holder control method. The method comprises the steps that a current posture and a target posture of a controlled end, a current posture of a fixed end and rotation inertia ratio of the fixed end to the controlled end on a holder are acquired; according to the current posture and the target posture of the controlled end, the current posture of the fixed end and the rotation inertia ratio of the fixed end to the controlled end, effective mechanical energy controlling the controlled end is calculated and acquired; and according to the effective mechanical energy, the controlled end is controlled to maintain a stable state. The invention further discloses a holder control device. According to the invention, the controlled end reaches the target posture and maintains the stable state; the holder is precisely controlled; body disturbance is effectively isolated; self-stabilization control of the holder is realized; and the imaging quality of a holder load camera is ensured.

The invention discloses an electronic device and a control method thereof. The electronic device comprises a main board, a display screen and a camera. The display screen is connected to the motherboard. The display screen includes a first display area and a second display area. The camera is connected to the motherboard. The camera is arranged on the side of the display screen adjacent to the main board, the lens of the camera is opposite to the first display area, the resolution of the first display area is smaller than the resolution of the second display area when the camera is in the working state, and the resolution of the first display area is the same as the resolution of the second display area when the camera is in the non-working state. According to the present application, thescreen occupancy ratio of the electronic device can be improved, the overall screen of the electronic device is facilitated, the light transmittance of the first display area can be increased and theimaging quality of the camera is guaranteed when the camera is in operation. Meanwhile, the display effect of the first display area is guaranteed when the camera is not in operation, thereby ensuringthe display effect of the whole display screen.

The invention relates to the technical field of terminal devices, and provides a display screen and a terminal device. The display screen comprises a display module, a cover plate and a shading unit.The cover plate covers the surface of the display module. The display module is provided with a display module through hole. The shading unit comprises a shading ring and a shading layer, the shadinglayer is attached to the surface of the display module through hole, the shading ring is arranged between the cover plate and the display module and corresponds to the display module through hole in position, and the diameter of the inner ring of the shading ring is smaller than that of the display module through hole. Through the blocking effect of the shading layer, light generated by the display module cannot pass through the surface of the through hole of the display module, so that the imaging effect of the camera is not influenced, and the imaging quality of the camera is effectively guaranteed. By arranging the shading layer, the diameter of the outer ring of the shading ring is reduced, and the imaging quality of the camera cannot be influenced, so that the size of the shading ringcan be further reduced, and the screen-to-body ratio of the display screen is increased.

The invention discloses a large field-of-view bionic compound eye visual system adopting a dome light cone. The system comprises a curved surface compound eye lens, an aperture diaphragm, the light cone and an image detector, which are connected with one another in sequence; the curved surface compound eye lens comprises sub eyes and a substrate, the sub eyes are hermetically bonded in the hexagonal array mode, the surface type of the sub eyes are non-spherical, the substrate is a curved surface substrate, the aperture diaphragm is a stepped type aperture diaphragm, and the light cone is a dome light cone. According to the invention, the dome light cone coupling strategy is used as the light path conduction mode, on one hand, a curved image formed by the compound eye lens is converted into a planar image, so as to be received by a plane detector, on the other hand, the large field of view image formed by the compound eye lens is compressed into a smaller image according to an equal ratio, so that the large field of view image can be completely imaged in a small-sized detector in a lossless mode, the coupling is realized, and the technical requirements on the size of detectors are accordingly reduced.

The invention discloses a virtual studio implementation method capable of automatically tracking objects. The virtual studio implementation method comprises the following steps: selecting a high-resolution real camera and setting a camera position so that the real camera is capable of getting a comprehensive shot of the whole range of the activities of objects without any operation; creating a virtual scene and an image matting plane; setting the position of a virtual camera; performing chroma key image matting on a picture picked up by the real camera and mapping the images of the objects into the image matting plane to form mapped images; calculating the positions of the objects during activities in a real scene by use of an image identification module; generating a group of attitude data based on the position information and controlling the operation of the virtual camera through the attitude data; generating a scene image by an image rendering system based on the picture picked up by the virtual camera; and synchronizing the mapped images and the scene image into an image for final presentation and generating a virtual studio to play videos. The virtual studio implementation method capable of automatically tracking the objects is capable of enabling the installation and debugging of the virtual studio to be simple and fast, and also capable of greatly saving cost.

The invention discloses an optical imaging lens unit comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in sequence from an object side to an image side. According to the invention, with control of concave-convex curved surface arrangement of all lenses, the lens unit is shortened, the field angle is increased, and the diaphragm value is reduced while the good optical performance is kept.

The invention discloses a high-safety JPEG image steganography method. The method includes the steps of acquiring the quantitative rounding error of each quantitative discrete cosine transformation coefficient in a transformation domain in the JPEG image compression process, and quantitative DCT coefficients x and X before and after rounding, defining corresponding longitudinal distortion and transverse distortion by the utilization of the quantitative DCT coefficient x and X before and after the rounding, building a minimized imbedded distortion model of the longitudinal distortion by the utilization of the quantitative rounding errors, calculating the optimal modification probability of each quantitative DCT coefficient according to the minimized embedded distortion model of the longitudinal distortion, the corresponding longitudinal distortion and the corresponding transverse distortion, converting the acquired optimal modification probability of each quantitative DCT coefficient into ternary distortion, calling check space time trellis codes, embedding a secrete message into the rounded quantitative DCT coefficient X which serves as a carrier, and performing packaging to form an integral JPEG image. The method ensures the safety of the embedded secrete message and good image quality after the secrete message is embedded.