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39 results about "Image diffusion" patented technology

Interactive system and control method for lighting and/or image diffusion

The present invention relates to an interactive system (1) for control of lighting and / or image diffusion, comprising: - at least one image acquisition device, in particular a video camera (2), - a base module (3) configured to receive and analyze information coming from the image acquisition device (2) in order to detect the presence of at least one person (P) in the field of the image acquisition device, - at least one control module (4) configured to receive a control signal coming from the base module (3) and to control, depending on said control signal, the intensity and / or orientation of at least one light source (5) and / or diffused visual contents, so that a predefined lighting law is respected.
Owner:安东尼・杜布莱

Holographic waveguide lens, preparation method thereof, and three-dimensional display apparatus

The invention discloses a holographic waveguide lens, a preparation method therefor and a three-dimensional display apparatus using the preparation method. The lens comprises one, two, three or more holographic waveguide lens units; the holographic waveguide lens unit is provided with three functional regions, respectively, a coupling functional region for input a light coupling, a relay functional region for X-direction image diffusion and an exit functional region for Y-direction image diffusion and output; the functional region is provided with a nano-diffraction grating. By setting the functional region, the volume of the three-dimensional display apparatus can be greatly reduced, and the color display and the expansion of a field angle can be conveniently realized. The nano-diffraction grating has low cost and good quality stability, and is suitable for industrial production.
Owner:SVG TECH GRP CO LTD +1

Digital image feedback encryption method based on image network

The invention discloses a digital image feedback encryption method based on an image network. The method comprises the following steps of processing a digital plaintext image; constructing the image network in which a node is a super-chaotic system and a non-neighbor connection mode is possessed; through three-dimensional Arnold, converting a scrambling image, wherein a scrambling matrix is driven by image-network space-time chaotic display and a current plaintext image; combining feedback information of the current plaintext image and a cryptograph image and carrying out image diffusion processing; alternatively operating scrambling and diffusion multiple times and acquiring the cryptograph image. In an encryption system, a scrambling-diffusion alternative-operated loop iteration structure is designed; during an encryption process, plaintext and cryptograph feedback mechanisms are introduced; and during each encryption, the used scrambling matrix and a secret key flow are dynamically changed and are different. An experiment result shows that the encryption method possesses high safety and high efficiency; and a capability of resisting various plaintext attacks, statistics attacks, violence attacks and difference attacks is high.
Owner:SHAANXI NORMAL UNIV

Image sensor pixel structure for preventing image diffusion and manufacture method thereof

ActiveCN103811512AInhibited DiffusionEliminate color distortion of surrounding pixelsRadiation controlled devicesImage diffusionGuidance channel
The invention discloses an image sensor pixel structure for preventing image diffusion and a manufacture method thereof. The image sensor pixel structure at least comprises a photodiode placed in a semiconductor base body, a shallow slot isolation region arranged on one side of the photodiode, two shallow slot isolation regions arranged on the other side of the photodiode, and a transistor drain terminal active region arranged between the two shallow slot isolation regions on the other side of the photodiode and connected with a power source, wherein a deep P-shaped well region is arranged on the shallow slot isolation region arranged the one side of the photodiode, and an N-shaped well region and a deep P-shaped well region are sequentially arranged on the transistor drain terminal active region and enable an overflow electric charge current guidance channel to exist among the transistor drain terminal active region and two portions of the photodiode, which are respectively adjacent to two sides of the transistor drain terminal active region. The image sensor pixel structure for preventing the image diffusion and the manufacture method thereof can prevent collected images from diffusing, and simultaneously eliminate the problem that colors of peripheral pixels of strong light images are distorted.
Owner:BEIJING SUPERPIX MICRO TECHNOLOGY CO LTD

Method for imaging diffusion anisotropy and diffusion gradient simultaneously

InactiveUS7411394B2Improve white matter fiber tractograpyMagnetic measurementsElectric/magnetic detectionDiffusion AnisotropyTissue architecture
Inhomogeneous tissue structures cause spatial-varying water molecule diffusion that is characterized by the spatial derivative of diffusivity, i.e., diffusion gradient. In a magnetic resonance imaging (MRI) system, the effects of diffusion and diffusion gradient are simultaneously encoded in an echo signal using diffusion-encoding magnetic field gradient pulses. A method for imaging the diffusion gradient of water molecules in tissues and for delineating the interface between two tissues having different diffusion properties is disclosed. The method also describes imaging diffusion anisotropy and diffusion gradient simultaneously without any additional scans in comparison with diffusion tensor MRI.
Owner:BOARD OF TRUSTEES OPERATING MICHIGAN STATE UNIV

Terahertz modulator based on silicon-based microstructure on SOI, system and method

The invention provides a Terahertz modulator based on a silicon-based microstructure on SOI, a manufacturing method and a modulation system. The Terahertz modulator successively comprises an Al2O3 substrate of a bottom layer, a SiO2 isolation layer, the silicon-based microstructures, and an Al2O3 passivation layer from bottom to top. The silicon-based microstructures are periodically arranged on the SiO2 isolation layer. Each silicon-based microstructure comprises a two-layer square Si-based step structure. The modulation system comprises a semiconductor laser, a laser modulator, the Terahertzmodulator, a Terahertz radiation source, and a Terahertz detector. In the invention, a reflectivity which is lower than 22% is achieved for a Terahertz wave of 0.4 THz to 0.85 THz and a minimum of 18% can be reached at 0.82 THz so that the reflectivity of a modulation device to the Terahertz wave can be significantly reduced and a utilization rate of the Terahertz wave is improved. A 64.5% modulation depth can be achieved under 808 nm laser radiation with 1200 mw power. Compared with a traditional silicon-based Terahertz modulator, a Terahertz imaging diffusion area can effectively increase aresolution and make the resolution reach above 21.9% in an imaging system.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Electrochromic device with improved display properties and fabrication method thereof

Disclosed are an electrochromic device and a method for fabricating the same. The electrochromic device comprises a transparent electrode, on which an electrochromic layer is formed, a counter electrode on which a reflective layer is formed, and an electrolyte layer interposed between the transparent electrode and the counter electrode. Since the electrolyte layer is formed in only an active region of unit pixels, neither crosstalk nor image diffusion occurs and only the selected region of unit pixels is operated. Thus, the electrochromic device can realize passive matrix displays capable of representing a desired color. Furthermore, the electrochromic device can be utilized in a variety of applications including flexible displays and electrical papers.
Owner:SAMSUNG ELECTRONICS CO LTD

Diffusion system for and automated luminaire

Described are an improved automated luminaire 12 and luminaire systems 10 employing an improved image diffusion system 27. The image diffusion system 27 is improved by providing a plurality of sets of optical diffusion elements that may be operated either concurrently or consecutively so as to provide an improved range and control of the applied image diffusion
Owner:ROBE LIGHTING

Image encryption method and device, equipment and storage medium

InactiveCN109510917ATo achieve the encryption effectImprove efficiencyPictoral communicationImage diffusionWavelet decomposition
The invention discloses an image encryption method and device, equipment and a computer readable storage medium. The method comprises the steps of after converting an original image to be encrypted into an M*N two-dimensional array H, inputting the M*N two-dimensional array H into a pre-selected chaos system of which an initial key and an initial parameter are set; performing L-stage wavelet decomposition on the original image, to acquire low-frequency sub-band coefficients and high-frequency sub-band coefficients in multiple different wavelet sub-band coefficients; scrambling the low-frequency sub-band coefficients by using the pre-selected chaos system; performing L-layer wavelet inverse transformation on the scrambled low-frequency sub-band coefficients and the high-frequency sub-band coefficients, to acquire a reconstructed image with the size of M*N; and performing image diffusion on the reconstructed image to acquire a target encrypted image of the original image. According to the method, device, equipment and computer readable storage medium provided by the invention, the encryption efficiency can be improved when the high-dimensional chaos system is used for encrypting theimage.
Owner:GUANGDONG UNIV OF TECH

Ink jet recording ink-absorption layer material and preparation method thereof

The invention relates to an ink jet recording ink-absorption layer material and a preparation method thereof, belonging to the field of ink jet recording materials. The invention solves the problems that the existing ink jet recording material has the defects of non-uniform color distribution, image diffusion, scraggly feeling of images touched by hands and poor wear resistance and has high preparation cost. In the invention, the ink jet recording ink-absorption layer material is prepared from sericite, dispersing agent and binding agent. The preparation method of the invention is as follows:1, preparing sericite powder; 2, preparing sericite suspension; 3, preparing coating solution; and 4, coating the coating solution after the treatment of substrate plasma, and then drying to obtain the ink jet recording ink-absorption layer material. The invention has the advantages of easily obtain raw materials, low cost and easy preparation. The ink jet recording ink-absorption layer material of the invention has the advantages of clear printed images, no ink droplet diffusion, even color distribution, smooth surface of images, no crack and smooth hand-touch feeling.
Owner:HARBIN INST OF TECH

Image encryption method based on chaotic mapping and chaotic S-box substitution

The invention provides an image encryption method based on chaotic mapping and chaotic S-box substitution in the technical field of image encryption, and the method comprises the steps: S10, obtaining a color image file, carrying out the Hash calculation, obtaining a Hash value, and calculating a system parameter based on the Hash value; step S20, generating four initial values of four-dimensional hyper-chaotic mapping based on the Hash values, and further obtaining four groups of chaotic pseudo-random sequences; s30, extracting a sequence Wz based on the chaotic pseudo-random sequence and system parameters, and generating a chaotic S box by using the sequence Wz and the S box using the AES algorithm; step S40, performing Arnold scrambling on the color image file to obtain a scrambled image, and performing byte substitution on the scrambled image by using a chaos S box to obtain a substituted image; and S50, performing image diffusion encryption on the three components of the RGB in the substitution image by using the chaos pseudo-random sequence and the system parameters to obtain three pieces of ciphertext data, and obtaining an encrypted image based on each piece of ciphertext data. The method has the advantage that the security of image encryption is greatly improved.
Owner:HUAQIAO UNIVERSITY

Image sensor pixel structure for preventing image diffusion and manufacturing method thereof

ActiveCN103824869AEliminate color distortion of surrounding pixelsPrevent Image Bleeding PhenomenonRadiation controlled devicesCharge currentImage diffusion
The invention discloses an image sensor pixel structure for preventing image diffusion and a manufacturing method thereof, wherein a shallow slot isolation region on one side of a photodiode of the image sensor pixel structure, one of two shallow slot isolation regions on the other side of the photodiode and an active region at a drain terminal part of a transistor are respectively provided with a deep P-type well region, wherein the deep P-type well region on the active region at the drain terminal of the transistor covers the shallow slot isolation region which is far away from the photodiode and is not in contact with the shallow slot isolation region which is close to the photodiode, so that an overflow charge current guide channel is formed between the photodiode and the active region at the drain terminal of the transistor. By adopting the image sensor pixel structure and the manufacturing method thereof disclosed by the invention, diffusion phenomenon of the acquired image can be prevented, and the problem of color distortion of surrounding pixels of an intense-light image is also eliminated.
Owner:BEIJING SUPERPIX MICRO TECHNOLOGY CO LTD

Image encryption and decryption method based on four-dimensional quantum Dicke mapping

The invention provides an image encryption and decryption method based on four-dimensional quantum Dicke mapping and relates to the field of image encryption technology. The invention aims to solve the shortage of key space and insufficient randomness, as well as inability to effectively resist known plaintext attacks and security flaws in selective plaintext attacks in the existing image encryption methods. The invention uses a quantum Dicke chaotic system as a key generator to generate a plurality of sets of scrambling keys and diffusion keys, which are randomly selected by a user. The invention ensures the key space and the key sensitivity, shortens the length of the key and reduces the cost of storing and transmitting the key by the user. The invention applies the hyperchaotic system of the fractional-order quantum cellular neural network to the image diffusion stage, The hyperchaotic characteristic of the fractional-order quantum cellular neural network system guarantees the randomness and ergodicity of image diffusion, and the encryption method of the invention can effectively resist the known plaintext attack and the selected plaintext attack because the diffusion key streamis related to plaintext.
Owner:CHANGCHUN UNIV OF SCI & TECH

Image encryption method based on Julia set and DNA coding

The invention discloses an image encryption method based on a Julia set and DNA coding, and the method comprises the steps: obtaining pixel matrixes IR, IG and IB of a plaintext image M on R, G and B channels, and generating Julia set generation parameters; generating a Julia set image based on the Julia set generation parameter, selecting a chaos region of the boundary of the Julia set image, and amplifying the chaos region to obtain a standard image R; performing multi-time magic-square scrambling on the standard image R, and after each time of magic-square scrambling, updating the key image A based on the currently generated scrambling image Ri and the standard image R; taking the middle part of the key image A to obtain a key image B, determining DNA coding parameters based on the key image B, and inputting a DNA coding algorithm; and performing image diffusion on the plaintext image M and the key image A according to a DNA coding algorithm to form a ciphertext image Q of the plaintext image M. According to the encryption method provided by the invention, the key space is large, the key storage space is small, the original image is not damaged, various attacks can be resisted, and the security is very high.
Owner:ANHUI NORMAL UNIV

Method for lowering noise of medical sonogram anisotropic diffusion

ActiveCN101075345AOvercoming the problem of poor adaptability of settingsNoise reduction results improvedUltrasonic/sonic/infrasonic diagnosticsImage enhancementDiffusionImage denoising
A method for decreasing noise of anisotropic diffusion on medical ultrasonic image includes confirming diffusion level according to gradient and diffusion parameter of pixel and updating grey scale of pixel simultaneously, calculating nonlinear correlation coefficient of this image diffusion noise-decreasing result to image being not diffused and ending image noise-decreasing treatment if said coefficient is less than assigned value or otherwise confirming diffusion level according to new gradient and diffusion parameter of pixel and updating grey scale of pixel till nonlinear correlation coefficient of adjacent two times of image is less than assigned value.
Owner:SONOSCAPE MEDICAL CORP

Apparatus for measuring parallelity of laser beam

The invention relates to an apparatus for measuring parallel of laser beam, which adopts the tested light beam, diaphragm, a convergence lens, a semi-transmitting reflector, two column lenses, two four-quadrant detectors and a computer to form the measuring apparatus; it also adopts a convergence lens a semi-transmitting reflector, two column lenses, two four-quadrant detectors to form light beam parallel detector; it does light beam parallel detecting based on image diffusion focusing error detecting. It adopts differential method to eliminate the detecting error from the incidence light off-axis. It can own any sensitivity and linear range by designing the optical system; especially be suit for detecting the light caliber with high quality, and the laser beam with small diffusing angle and rotational symmetry.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI

Method for removing block effect of video image

The invention relates to a method for removing block effect by curvature driving and edge stop non-linear diffusion. The method comprises the following steps of: calculating the absolute value of gradient of each pixel in an image and the absolute value of the curvature of isophotes of the image and determining the diffusion coefficient value of each pixel according to the two parameters; then removing the block effect through non-linear diffusion algorithm, namely determining the diffusion degree according to the diffusion coefficient, and updating the gray value of the pixel; and finally calculating the signal-to-noise ratio of the result of the image diffusion, if the signal-to-noise ratio is higher than a designated value, finishing the image processing, and if the signal-to-noise ratio is not higher than a designated value, returning to the first step to continue the processing until the signal-to-noise ratio is higher than the designated value. The method is suitable for filtering the block effect of a reconstructed image and can protect the edge with good effect.
Owner:AVONACO COMM SYST SUZHOU

An Image Encryption Method Based on Hyperchaotic System Pixel Information Association

The invention discloses an image encryption method based on the association of pixel information of a hyper-chaotic system, which adopts a three-level encryption structure of image diffusion encryption, image scrambling encryption and image diffusion encryption. Different chaotic sequences generated by the chaotic system, the overall information of the image and the information of the pixel points are dynamically generated; the x chaotic sequence generated by the hyper-chaotic system and the position information of the plaintext image pixels generate the dynamic key for the first image diffusion encryption; The key of scrambling encryption is jointly generated by the y and z chaotic sequences of the hyperchaotic system, the overall information of the diffused encrypted ciphertext, and the data information of the diffused encrypted ciphertext; the chaotic sequence w and the position of the pixels of the scrambled encrypted ciphertext The information generates the dynamic key for the second image diffusion encryption. The invention has the characteristics of high plaintext sensitivity, large key space and high ciphertext information entropy.
Owner:BEIJING UNIV OF TECH

Image encryption method based on LFSR state sequence

The invention relates to an image encryption method based on an LFSR state sequence. The method comprises the steps of image scrambling; Image diffusion; performing system space analysis; generating a128b sequence of the LFSR; performing image encryption analysis; obtaining results. According to the invention, the problems of small key space and limited precision of an encryption system in the prior art are overcome. The 128b sequence of the LFSR ensures the security of the encryption system. And the encryption effect of one-time encryption ensures the security of the plaintext image.
Owner:深圳竹云科技股份有限公司

An Image Encryption Method Based on Chaotic Map and Chaotic S-Box Substitution

The present invention provides an image encryption method based on chaotic mapping and chaotic S-box substitution in the technical field of image encryption, including: step S10, obtaining a color image file and performing hash calculation to obtain a hash value, based on the hash value calculation system Parameters; Step S20, generating four initial values ​​of the four-dimensional hyperchaotic map based on the hash value, and then obtaining four sets of chaotic pseudo-random sequences; Step S30, extracting sequences based on the chaotic pseudo-random sequences and system parameters W z , using the sequence W z And use the S box of AES algorithm to generate chaotic S box; Step S40, carry out Arno l d scrambling to color image file to obtain scrambling image, utilize chaotic S box to carry out byte substitution to scrambling image and obtain replacement image; Step S50, Using chaotic pseudo-random sequence and system parameters, image diffusion encryption is performed on the three components of RGB in the substitution image to obtain three ciphertext data, and the encrypted image is obtained based on each ciphertext data. The invention has the advantages of greatly improving the security of image encryption.
Owner:HUAQIAO UNIVERSITY

Partial structure self-adapted image diffusing and de-noising method

The invention provides a self-adaptive image diffusion denoising method of a local structure, which particularly relates to a classification method of an image local structure and a method for determining a diffusion conductivity coefficient according to the local structure. Image diffusion simulates the thermal diffusion form of the physics to carry out diffusion smoothing treatment to the pixelvalue of an image and realize the purpose of denoising. Anisotropic diffusion can retain detailed information, such as edge, line, and the like, when image smoothing is carried out. The anisotropic diffusion method that can regulate the diffusion strengths of different directions according to the local tiny structure of the image is provided by the invention. At first, pixel classification is carried out according to the local structure; different conductivity coefficient functions are defined for different types; and diffusion flow is figured out according to the functions, thereby realizingimage diffusion denoising under the condition of retaining edge information.
Owner:UNIV OF SCI & TECH BEIJING

Image processing program, image processing terminal, image processing system, and image processing method

An image processing program for causing a computer to execute a procedure for acquiring a first image, a procedure for acquiring a second image, a procedure for altering at least a portion of the second image in accordance with a signal, and a procedure for modifying the first image using the altered second image is disclosed. The second image is at least one of a hand-drawn image, a text character image, or a selected image, and the signal is used for diffusing the second image in the procedure for altering at least a portion of the second image.
Owner:FAST RETAILING

Diffusion information-based image defogging method and system under foggy condition

PendingCN113643199ASolve the problem of passive perception effect checkGood fog removal effectImage enhancementImage analysisComputation complexityImage diffusion
The invention discloses a diffusion information-based image defogging method and system under a foggy condition. The method comprises the following steps: acquiring a foggy image of a to-be-detected area; carrying out image information enhancement on the acquired foggy image by utilizing image diffusion; and outputting the processed image. The system comprises an image acquisition module, a defogging processing module and an image output module. According to the invention, image defogging is realized based on an image diffusion forming mechanism, a better defogging effect can be obtained, the cost is low, the operation is simple, and the calculation complexity is low.
Owner:SHANGHAI JIAO TONG UNIV

a light diffuser

ActiveCN106154367BRealize graphical arrangementFlexible regulationDiffusing elementsMicro structureImage diffusion
The invention discloses a light diffuser and a manufacturing method. The light diffuser is structurally characterized by comprising a transparent base material layer; a micro structure layer is arranged on the surface of one side of the transparent base material layer, and the sunken structure of the micro structure layer is filled with diffusion particles. In order to obtain the light diffuser, the manufacturing method of the light diffuser is characterized in that a mold of a topology arrangement pattern protrusion structure copies the mold structure on a transparent substrate in an embossing mode to obtain the sunken structure complementary with the mold structure; on the basis of a blade coating technology, the diffusion particles coat the micro sunken structure to form imaging diffusion particle arrangement. Due to the imaging diffusion particle arrangement, the problem that a traditional random structure cannot perform artificial optimization is solved, and under the joint action of the imaging structure and the diffusion particles, the light diffusion effect is generated for back light source and beam shaping direction.
Owner:SUZHOU UNIV

Multi-image Encryption Algorithm in Space Domain Based on Chaotic System

The invention belongs to the field of image processing and provides a spatial domain multi-image encryption algorithm based on a chaotic system, including a bit-level multi-image scrambling method and a multi-image diffusion method. In this algorithm, pixels in an image can be dispersed into different images after being scrambled, and small changes in a plain text image can be spread to all images. This algorithm can achieve high security in histogram analysis, correlation coefficient analysis and information entropy analysis. It has a simple structure, high encryption efficiency and is easy to implement. It can be applied in the fields of business, e-government, personal affairs and other fields.
Owner:NORTHEASTERN UNIV LIAONING
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