Projector Color Temperature Calibration Using an External Camera

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Solution Overview

Problem

Traditional projectors lack built-in sensors to automatically detect and adjust color temperature, relying on user subjective judgment which is susceptible to environmental influences and personal preferences, leading to inaccurate adjustments.

Innovation Solution

A color temperature calibration system using an electronic device with an image capturing module and processor to project a calibration image, capture an environment image, calculate a color temperature estimate value, and adjust projector parameters accordingly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If projectors rely on user subjective judgment for color temperature adjustment through OSD menu, then device complexity is reduced, but measurement precision and adjustment accuracy deteriorate

Engineering Contradiction:

Improveprojector structureVSAvoidcolor temperature measurement accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent introduces an electronic device as an intermediary component that contains an image capturing module and processor. This intermediary captures images of the projection surface, extracts color information, and calculates color temperature objectively, thereby improving measurement precision without significantly increasing the projector's own complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the mechanical/manual color temperature adjustment method (where users visually assess and manually adjust OSD parameters) with an automated optical-electrical system. The image capturing module captures optical information, the processor converts it to electrical signals for color temperature calculation, and the projector automatically adjusts based on calculated values, eliminating subjective human judgment.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Device complexity

If projectors lack built-in sensors for automatic color temperature detection, then device complexity and manufacturing cost are reduced, but adaptability to different environmental conditions deteriorates

Engineering Contradiction:

Improveprojector structureVSAvoidcolor temperature adaptation to environment

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent makes the electronic device multi-functional by combining image capturing, color temperature calculation, and adjustment control in a single device. This universal device can adapt to different environmental lighting conditions without requiring the projector itself to have specialized sensors, thereby achieving environmental adaptability while keeping the projector structure simple.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system enables self-service operation where the electronic device automatically captures images, calculates color temperature based on environmental conditions, and adjusts projector parameters without requiring user intervention. This automated feedback loop allows the system to adapt to changing environmental conditions autonomously.

Inventive Principle:

Principle #25Self-service

3Ease of operation

If users manually adjust color temperature based on personal preference, then ease of operation is improved, but manufacturing precision and consistent image quality deteriorate

Engineering Contradiction:

Improveadjustment operationVSAvoidimage quality consistency

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent implements a feedback mechanism where the image capturing module continuously monitors the projection surface, the processor calculates the actual color temperature based on captured images, and the projector adjusts its output based on this feedback. This closed-loop system ensures consistent image quality by objectively measuring and correcting color temperature deviations, eliminating variability from manual adjustments.

Inventive Principle:

Principle #23Feedback

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enhances image quality by accurately adjusting color temperature based on environmental conditions, reducing reliance on user judgment and improving calibration efficiency.

Implementation Method 1

The image capturing module captures an image towards the projection surface to generate an environment image

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS20260075175A1System, method and non-transitory computer readable storage medium for correcting color temperature

Publication Date: 2026.03.12 CORETRONIC CORPORATION

AI summary

The disclosure provides a color temperature correction system, a color temperature correction method, and a non-transitory computer-readable storage medium. The system includes a projector and an electronic device. In response to a color temperature correction instruction, the image capturing module on the electronic device is enabled, and the projector projects a light beam to form a calibration image on a projection surface. The image capturing module captures an image of the projection surface and generates an environment image. The processor acquires a region image corresponding to the calibration image within the environment image. Based on the region image and multiple capture parameters of the image capturing module at the time of capturing the environment image, the processor calculates a color temperature estimate value and sends it to the projector, which adjusts projection parameters accordingly.