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42 results about "Ula-ai-hawane" patented technology

Traffic light identification method and device

The invention discloses a traffic light identification method and device, and belongs to the field of traffic safety. The traffic light identification method comprises the steps that an original image is collected; threshold segmentation is conducted on three channel values of the original image in an RGB space to obtain a black region binary image; according to the characteristics of a light panel, the light panel area is positioned in the black region binary image; the portion, in the light panel region, of the original image is converted from the RGB space to a YCbCr space to obtain a red and yellow region binary image and a green region binary image through segmentation; according to the characteristics of traffic lights, traffic light candidate regions are determined on the red and yellow region binary image and the green region binary image; graying and normalization are conducted on the portion, in the traffic light candidate regions, of the original image, and Gabor wavelet transformation is conducted on the image obtained after graying and normalization to obtain a Gabor wavelet image; the amplitude of the Gabor wavelet image is sampled to obtain a feature vector; the similarity between the feature vector and a training sample is compared to determine the types of the traffic lights.
Owner:CHERY AUTOMOBILE CO LTD

Divalent manganese ion activated fluorescent powder, a preparing method thereof and applications of the fluorescent powder

Divalent manganese ion activated fluorescent powder, a preparing method thereof and applications of the fluorescent powder are disclosed. Alkali metal carbonate, zinc oxide or magnesium oxide, manganese dioxide and ammonium biphosphate are adopted as raw materials in the method. The raw materials are fully ground after being weighed according to a stoichiometric ratio, are put into a muffle furnace and are subjected to low-temperature primary pre-sintering and high-temperature secondary sintering, a three-dimensional net structure having special rigidity of a matrix compound is utilized to achieve self-reduction of tetravalent manganese ions into divalent manganese ions in a non-reducing atmosphere, and the inorganic phosphate red and yellow fluorescent powder is obtained. The fluorescent powder can be applied for red and yellow fluorescent powder for warm white LEDs. Self-reduction of the tetravalent manganese ions into the divalent manganese ions is achieved through direct sintering under air conditions. The raw materials are simple, easily available and low in cost. The preparing process is simple. The prepared red and yellow fluorescent powder cannot be oxidized in high-temperature environment, and chromaticity coordinates do not be offset. The method is a method of preparing the divalent manganese ion activated fluorescent powder through manganese ion self-reduction.
Owner:NANKAI UNIV

Anti-fake method for displaying hidden red, green and yellow graphics and text information on red printing substrate

Anti-fake graphics and text information is printed on a substrate with a red surface through red and yellow functional printing ink. The color of the red functional printing ink is consistent with the red ground color of the substrate under the illumination of sunlight or white light, and the color of the yellow functional printing ink is light yellow. The light with the central wavelengths being 515 nm (bright green), 525 nm (bright green), 530 nm (bright green), 545 nm (bright yellow), 555 nm (bright yellow), 600 nm (orange), 610 nm (orange), 615 nm (orange), 620 nm (red), 620 nm (red), 635 nm (red), 655 nm (red) and 660 nm (red) is emitted under the illumination of blue light of a mobile phone screen or monochromatic light or compound light with the wavelength ranging from 400 nm to 500 nm according to species varieties of red pigment and yellow pigment. The ordinary red pigment is used for the surface of the substrate and does not change obviously under the illumination of blue light with the corresponding wavelength. The anti-fake graphics and text information is completely or partially invisible under the white light, and the anti-fake graphics and text information emits bright green or bright yellow or bright red visible light under the illumination of the blue light of the mobile phone screen or the light with the wavelength ranging from 400 nm to 500 nm.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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