A method for acquiring at least one two-dimensional image of a part of arches of a patient includes steps carried out by the patient or other person who is not a dental health professional, for example, including placing a dental separator in the mouth of the patient in order to separate the lips of the patient and improve the visibility of the teeth during the acquisition of said at least one two-dimensional image, and acquiring, in a mouth closed position and with a personal image acquisition apparatus, said at least one two-dimensional image.

A method for acquiring at least one two-dimensional image of a part of arches of a patient includes steps carried out by the patient or other person who is not a dental health professional, for example, including placing a dental separator in the mouth of the patient in order to separate the lips of the patient and improve the visibility of the teeth during the acquisition of said at least one two-dimensional image, and acquiring, in a mouth closed position and with a personal image acquisition apparatus, said at least one two-dimensional image.

In one or more implementations, the apparatus, systems and methods disclosed herein are directed to calibrating a smart phone with an arbitrary phone case for color lookup applications, wherein the calibration process includes obtaining, with the smartphone without the case equipped, a first measurement data set that includes at least one measurement of each of a black, white and grey calibration target; obtaining, with the smartphone with the case equipped, at least three exposure measurements of a white calibration target at least three different exposure times; calculating an optimized exposure time using at least the at least three exposure measurements; obtaining, with the smartphone with the case equipped, a second measurement data set that includes at least one measurement of each of a black, white and grey calibration target at the optimized exposure time; generating fitting parameters from the first and second measurement datasets; and storing the generated fitting parameters and optimized exposure time in at least one of a local or remote data storage device.

An electrical color chart tape measure apparatus for viewing a color code chart while measuring conduit includes a tape having a housing front side with a blade aperture extending therethrough adjacent the housing bottom side. A tape blade is coupled within the tape housing and is slidably extendable and retractable through the blade aperture. The tape blade has a blade top side with a plurality of hash markings and a plurality of corresponding numerical inch measurement markings. A claw is coupled to a distal end of the tape blade. A plurality of color indicators is coupled to the tape blade between the plurality of numerical inch measurement markings. A color chart is coupled to the tape housing and has a low voltage color key and a high voltage color key corresponding with the plurality of color indicators.

An electrical color chart tape measure apparatus for viewing a color code chart while measuring conduit includes a tape having a housing front side with a blade aperture extending therethrough adjacent the housing bottom side. A tape blade is coupled within the tape housing and is slidably extendable and retractable through the blade aperture. The tape blade has a blade top side with a plurality of hash markings and a plurality of corresponding numerical inch measurement markings. A claw is coupled to a distal end of the tape blade. A plurality of color indicators is coupled to the tape blade between the plurality of numerical inch measurement markings. A color chart is coupled to the tape housing and has a low voltage color key and a high voltage color key corresponding with the plurality of color indicators.

In one embodiment, a diagnostic system for biological samples is disclosed. The diagnostic system includes a diagnostic instrument, and a portable electronic device. The diagnostic instrument has a reference color bar and a plurality of chemical test pads to receive a biological sample. The portable electronic device includes a digital camera to capture a digital image of the diagnostic instrument in uncontrolled lightning environments, a sensor to capture illuminance of a surface of the diagnostic instrument, a processor coupled to the digital camera and sensor to receive the digital image and the illuminance, and a storage device coupled to the processor. The storage device stores instructions for execution by the processor to process the digital image and the illuminance, to normalize colors of the plurality of chemical test pads and determine diagnostic test results in response to quantification of color changes in the chemical test pads.

In one embodiment, a diagnostic system for biological samples is disclosed. The diagnostic system includes a diagnostic instrument, and a portable electronic device. The diagnostic instrument has a reference color bar and a plurality of chemical test pads to receive a biological sample. The portable electronic device includes a digital camera to capture a digital image of the diagnostic instrument in uncontrolled lightning environments, a sensor to capture illuminance of a surface of the diagnostic instrument, a processor coupled to the digital camera and sensor to receive the digital image and the illuminance, and a storage device coupled to the processor. The storage device stores instructions for execution by the processor to process the digital image and the illuminance, to normalize colors of the plurality of chemical test pads and determine diagnostic test results in response to quantification of color changes in the chemical test pads.

An image processing apparatus is configured to: acquire a correction factor from a recording unit for recording, for each of a plurality of pixels, the correction factor for correcting a difference in pixel value corresponding to a difference between a spectral sensitivity and a preset reference spectral sensitivity in a predetermined wavelength range at a pixel of interest, based on image data generated by an image sensor, the image sensor having the plurality of pixels on which color filters of a plurality of colors with different spectral transmittances are respectively located, the color filters forming a predetermined array pattern; calculate a correction amount for correcting a pixel value of the pixel of interest based on the correction factor at the pixel of interest and pixel values of pixels surrounding the pixel of interest; and correct the pixel value of the pixel of interest by using the correction amount.

A skin color chart (10) according to an example aspect of the present disclosure includes: a substrate (11); a first skin color display part (BK) configured to show a skin color of a Negroid, the first skin color display part being formed on the substrate (11); and a second skin color display part (WT) configured to show a skin color of a Caucasoid, the second skin color display part being formed on the substrate (11). Lightness L* of the first skin color display part (BK) in a CIE L*a*b* color space satisfies 20≤L*≤37, and lightness L* of the second skin color display part (WT) in the CIE L*a*b* color space satisfies 74≤L*≤81.

A color calibration system for color correction in an optical device using a database of target colors includes a physical target card. The physical target card includes at least three unique colored patches arranged in a predetermined pattern on the physical target card, identifying indicia, and alignment indicia. The color calibration system also includes an executable machine-readable software. The software is configured to read and assign a value to the colored patches. The software is further configured to read the identifying indicia and identify the physical target card, and to read the alignment indicia for identifying individual colored patches. The software is further configured to compare color values in the optical device to known factory color values, generate a target card profile, and convert native color space for use in subsequent images under the same lighting conditions.