39 results about "Image diffusion" patented technology

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.

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.

There is provided provide an image-forming apparatus that is capable of bringing a transfer film and a print medium into intimate contact without any gap therebetween, to thereby enhancing the quality of an image transferred from the film to the print medium. An image-forming apparatus uses a print medium, and a transfer film formed of a water-soluble resin material and having a smooth printing surface, to form a transferred image on the print medium. An image is printed on the printing surface of the transfer film, with sublimable dye ink. The printed transfer film and the print medium are overlaid such that the printing surface of the transfer film faces a transfer surface of the print medium. The printed transfer film and the print medium overlaid to each other are sandwiched and a thermal pressing process is performed on the printed transfer film and the print medium to cause the image printed on the transfer film to be diffused and fixed on the transfer surface. At this time, a pressure heating roller performs pressure rolling on the printed transfer film and the print medium overlaid to each other, from a non-printing surface side of the transfer film. Alternatively, a pair of pressure heating rollers sandwich the printed transfer film and the print medium overlaid to each other therebetween, and send them forward by rotation thereof.

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.

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.

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.

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.

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

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.

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.

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.

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.

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.

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.

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.

A transparent base has a first surface that is textured, and a second surface that is textured and is located on an opposite side of the transparent base from the first surface. A 20° effective reflected image diffusion index value R_b20° and a 45° effective reflected diffusion index value R_b45° used for evaluation of the first and second surfaces satisfy a relationship R_b20°−R_b45°>=0.05.

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.

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.

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.