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A high-precision imaging colorimeter calibrated by a specially designed pattern closed-loop assisted by a spectrometer

A technology of colorimeter and spectrometer, applied in the field of colorimetry, can solve the problems of high absolute measurement accuracy of imaging photometer and colorimeter

Active Publication Date: 2019-12-13
APPLE INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the absolute measurement accuracy of imaging photometers and colorimeters is not as high as that of spectrometers
This is because of the working principle using a CCD sensor combined with an optical filter, which can only be adapted to the sensitivity of the human eye with limited accuracy

Method used

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  • A high-precision imaging colorimeter calibrated by a specially designed pattern closed-loop assisted by a spectrometer
  • A high-precision imaging colorimeter calibrated by a specially designed pattern closed-loop assisted by a spectrometer
  • A high-precision imaging colorimeter calibrated by a specially designed pattern closed-loop assisted by a spectrometer

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Embodiment Construction

[0021] Representative applications of methods and apparatus according to this patent application are described in this section. These examples are provided only to add context and facilitate understanding of the described embodiments. It will therefore be apparent to one skilled in the art that the described embodiments may be practiced without some or all of these specific details. In other instances, well known process steps have not been described in detail in order to avoid unnecessarily obscuring the embodiments. Other applications are also possible, such that the following examples should not be considered limiting.

[0022] In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration specific embodiments in accordance with which they are described. While these embodiments are described in sufficient detail to enable those skilled in the art to practice the described embod...

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Abstract

This specification describes various embodiments related to methods for providing a broadband colorimeter that may include more accurate output. In one embodiment, a narrowband instrument, such as a spectrometer or spectrometer, can be used to calibrate the broadband colorimeter so that a more accurate output can be provided. In one embodiment, an optical test setup consisting of both a broadband colorimeter and a narrowband spectrometer can be used to provide a more accurately calibrated broadband colorimeter. As an example, a spectroscopic camera that is a hybrid system consisting of both a broadband colorimeter and a narrowband spectrometer may be used for simultaneous testing by both the broadband colorimeter and the narrowband spectrometer. Accurate calibration of broadband colorimeters is achieved by performing simultaneous tests. This specification also describes a mathematical model for characterizing a broadband three-channel colorimeter using a narrowband multi-channel spectrometer.

Description

technical field [0001] The described embodiments relate generally to colorimetry, and more specifically to calibrating low cost colorimeters. Background technique [0002] Color measurement instruments fall into two categories: broadband (or broadband) and narrowband. Broadband measuring instruments report up to three color signals resulting from optical processing of input light through broadband filters. A photometer is the simplest example, providing only a measure of the brightness of the stimulus. Their primary use is to determine the non-linear calibration capabilities of displays. A densitometer is an example of a broadband instrument that measures the optical density of light filtered through red, green, and blue filters. A colorimeter is another example of a broadband instrument such as CIELAB that directly reports tristimulus (XYZ) values ​​and their derivatives. A colorimeter, sometimes called an imaging photometer, is an imaging device that behaves like a cam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J3/46
CPCG01J3/513G01J3/50G01J3/502G01J3/524G01J3/506G01J3/0291G01J3/0294G01J3/0297G01J3/462G01J3/465G01J3/51G01J3/0218G01J3/0243G01J3/28
Inventor 尹叶G·玛库吴佳颖
Owner APPLE INC