摘要:
The invention relates to an illumination standard calculation method for a tunnel entrance section in daytime based on safe visual recognition. The method includes: (a) setting light environment parameters of the tunnel entrance section; (b) determining a feature position in the tunnel, and measuring the average road surface brightness L of the feature position; (c) placing a target object in the feature position and then making a driver drive at different speeds from outside the tunnel towards the target object to measure visual recognition distances D required by the driver to visually discover the target object under different driving speeds, and measuring the road surface brightness L 20 at the position where the driver visually discovers the target object and calculating the brightness reduction factor K to be the ratio between L and L 20 ; (d) resetting the average road surface brightness L of the tunnel entrance section and repeating steps (b) and (c) to obtain a plurality of different sets of visual recognition distances D and corresponding brightness reduction factors K; (e) using Sigmoid function model to calculate and fit the data of the plurality of sets of D and K to obtain a relational model formula of D and K: D = 215 1 + e ˆ’ 70 K + 96 + 27.6 ; (f) substituting a safe stopping sight distance D 0 corresponding to a maximum speed limit of the tunnel into the formula to obtain the minimum brightness reduction factor K 0 of the tunnel entrance section in daytime. The invention also relates to a system for implementing the illumination standard calculation method for a tunnel entrance section in daytime based on safe visual recognition.
摘要:
An illumination equalizing device includes a polygonal rotary column (200) disposed in a sealed space, equipped with light sources, and rotatable at specific angular intervals, light sources (210) radiating light onto an image test member (220) attached to a wall of the sealed space for testing a digital image, the light sources (210) mounted on side surfaces of the polygonal rotary column (200), illuminometers (222, 224, 225, 227, 229) measuring illumination values of light radiated onto the image test member (220), and a rotary column control unit (260) rotating the polygonal rotary column (200) at set angular intervals so that the illumination values measured by the illuminometers (222, 224, 225, 227, 229) are equalized. A method for equalizing the illumination of light sources (210) for a digital image test member (220), and an apparatus and method for testing the color of a digital image uses the illumination equalizing device.
摘要:
The present disclosure relates to a proximity illuminance sensor and a mobile terminal using the same, and disclosed is the mobile terminal of which an upper bezel can be shortened by using: the proximity illuminance (IR) sensor disposed on the rear surface of a front case and disposed to be perpendicular to a display unit; and a light reflector disposed at one side of the proximity illuminance sensor, such that light is incident to the proximity illuminance sensor or emitted from the proximity illuminance sensor to the outside.
摘要:
This invention relates to an illumination standard calculation method for a tunnel middle section based on safe visual recognition: (a) Setting the light environment of the tunnel middle section; (b) Placing a target object in the tunnel middle section; (c) Making a driver drive a motor vehicle at different speeds toward the target object, and measuring the visual recognition distances D required by the driver to visually discover the target object at different speeds; (d) Resetting the average brightness L of the tunnel middle section and repeating the steps (b) and (c) to obtain a plurality of different sets of visual recognition distances D and corresponding brightness values L; (e) Using the S model to fit the data of the plurality of sets of visual recognition distances D and brightness values L to obtain the formula of the relational model of D and L to be L=0.683/(5.575-In(D)); (f) Substituting a safe stopping sight distance D 0 corresponding to a maximum speed limit of the tunnel into the model formula to obtain the dynamic minimum brightness value L 0 required for the tunnel middle section under this tunnel light environment. The method improves the accuracy of safety evaluation of the tunnel middle section brightness, and the method is simple and convenient, and provides a reference basis for the road traffic safety research. The invention also provides a system for implementing this method.
摘要:
Various embodiments include systems and methods to provide selectable variable gain to signals in measurements using incident radiation. The selectable variable gain may be used to normalize signals modulated in measurements using incident radiation. The selectable variable gain may be attained using a number of different techniques or various combinations of these techniques. These techniques may include modulating a modulator having modulating elements in which at least one modulating element acts on incident radiation differently from another modulating element of the modulator, modulating the use of electronic components in electronic circuitry of a detector, modulating a source of radiation or combinations thereof. Additional apparatus, systems, and methods are disclosed.
摘要:
The invention relates to simplified portable method of measuring light sources by limiting the number of parameters to measured for example to one plane of radiation where know characteristics are preselected or default selected to be used to calculated combined output. Further more is light measurements combined with power calculation and control where phase of supply current is used to obtain light source flickering, determine dimmable. Further more can an imaging recording device be used to further enhance the measurements.