Projector Focus Adjustment via Stable Maximum Evaluation Values
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Solution Overview
Problem
Existing image processing technologies for projectors face challenges in achieving precise manual focus adjustment, as users struggle to interpret evaluation values effectively, leading to difficulties in achieving optimal focus due to manual adjustments based on changing evaluation values.
Innovation Solution
An image processing apparatus that includes an evaluation value acquisition section, an output section, and an update section, which acquires and updates evaluation values to prevent erroneous maximum values, allowing users to perform precise focus adjustments by displaying the appropriate maximum value after a predetermined period or when evaluation values increase and decrease, ensuring accurate focus adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the maximum evaluation value is updated continuously without filtering, then the responsiveness of the focus adjustment guidance is improved, but erroneous maximum values may be outputted leading to reduced accuracy
Solution Approach 1:
The system performs preliminary filtering of evaluation values before displaying them as maximum values. By checking whether the current evaluation value is genuinely higher than previous values and maintaining a history of evaluated values, the system prepares accurate guidance information in advance, preventing erroneous maximum values from being displayed while maintaining responsive focus adjustment guidance.
2Measurement precision
If the maximum value is updated only after a predetermined period, then erroneous maximum values are filtered out improving accuracy, but the responsiveness of the focus adjustment guidance deteriorates
Solution Approach 1:
The system dynamically adjusts the update frequency of maximum evaluation values based on the current focus adjustment state. When the projection optical system is near the optimal focus position, the system increases update frequency by comparing current values with historical data. When far from optimal position, updates occur less frequently. This dynamic approach balances accuracy and responsiveness according to the actual focus adjustment progress.
Solution Approach 2:
The system changes the parameter of evaluation value comparison by maintaining a history of evaluated values and comparing current values against this history. This parameter change allows the system to distinguish between temporary fluctuations and genuine maximum values, improving accuracy while maintaining appropriate responsiveness through intelligent update timing.
3Ease of operation
If manual focus adjustment is performed based on continuously changing evaluation values, then the ease of operation is improved, but the precision of focus adjustment deteriorates due to difficulty in interpreting changing values
Solution Approach 1:
The system provides feedback by displaying the maximum evaluation value from historical data rather than continuously changing raw evaluation values. This feedback mechanism gives users a stable reference point (the maximum value achieved so far) while performing manual focus adjustment, making it easier to interpret the current focus quality and determine when optimal focus has been achieved, thereby improving both ease of operation and precision.
Data Source
AI summary
A projector that acquires evaluation values representing how well projection light is brought into focus on a screen, outputs the acquired evaluation values and a maximum value of the acquired evaluation values, and updates the maximum value to a new value at a predetermined timing.