329results about How to "Avoid overexposure" patented technology

The present invention provides an eye-controlled password input apparatus, method and computer-readable recording medium. The apparatus comprises a display device to display a password menu, an image capturing device to capture an user's eye region image, a memory unit to store at least one preset password and a corresponding account number, a control unit to generate the password menu according to the preset password, and an image processing unit. The image processing unit obtains a plurality of reference objects from the eye image so as to recognize the eye movement direction and to confirm password input. After input a character of the password, the display device generates another password selection menu for the user to input another password character until the password input program is completed.

A method for the extraction, separation, fractionation and purification of biopolymers from plant materials using supercritical and / or subcritical solvent extractions is disclosed. Specifically, the process can be used for the separation of resins and rubber from guayule shrub (Parthenium argentatum), and other rubber and / or resin containing plant materials, using supercritical solvent extraction, for example supercritical carbon dioxide extraction. Additionally, polar and / or non-polar co-solvents can be used with supercritical carbon dioxide to enhance the selective extraction of resins and rubbers from the shrub.

Embodiments of the present invention disclose a method for adjusting image brightness, a terminal, and a computer-readable storage medium. The method includes: determining a first average brightness value and a second average brightness value of a collected image, wherein the first brightness average value is a brightness average value of the entire image, and the second brightness average value is a brightness average value of a face area in the image; and according to the first brightness average value and the second brightness average value, determining a third brightness average value of the image; determining a brightness adjustment value of the image according to the third brightness average value; and adjusting the brightness of the entire image according to the brightness adjustment value.

An imaging device is disclosed, and comprises an image sensor and an electronic black card. The image sensor comprises a sensitization surface provided with a plurality of sensitization units and a microprocessor. The microprocessor comprises a brightness analysis module and a judgment module. The brightness analysis module carries out analysis on the environment brightness to obtain an optimal exposure time. The judgment module judges whether the image has an over-exposed area. The electronic black card is located on one side of the sensitization surfaces of image sensor, and comprises a plurality of switch units corresponding to the sensitization units, and a control unit. The control unit is used for calculating opening time of each switch unit, and controlling the opening and closing of each switch unit according to the opening time of each switch unit. The imaging device of the invention controls sensitization time of each sensitization unit by opening and closing each switch unitof the electronic black card, so as to avoid over-exposure of the image before the image is generated. In addition, an imaging method is also provided.

A receptor positioning device for taking dental bitewing radiographs of a patient's teeth comprises a receptor holding member adapted to receive a receptor for exposing x-radiation from the x-ray machine and a collimation plate having a substantially flat surface for aligning with an x-ray machine. The collimation plate has a rectangular opening in its surface for passage of radiation from the x-ray machine to expose a receptor in the receptor holding member and a pair of handles extending away from the plate for positioning the device. The collimation plate is constructed of metal having a thickness of at least 0.075 in., preferably at least 0.100 in., to reduce the passage of radiation from the x-ray machine to the patient except at the plate opening. The device also includes an arm between the collimation plate and the receptor holding member, the arm including a biting surface for engaging the patient's teeth to secure the device in the patient's mouth, and an aiming ring secured to the arm at a position distal from the receptor holding member, with the collimation plate being secured to the aiming ring. The aiming ring may also include notches and the collimation plate preferably includes clips for removably securing the plate to the aiming ring and tabs for locating the plate relative to the aiming ring notches.