Camera Viewfinder Continuous Colour Temperature Adjustment
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Solution Overview
Problem
Standard camera viewfinders have a fixed colour temperature of 6500K, which can cause discrepancies between the real scene and the viewfinder display, making it difficult for operators to focus or compose images accurately due to unadjusted colour rendering.
Innovation Solution
A camera viewfinder with continuously variable colour temperature adjustment between 3000K and 9000K, allowing the operator to match the viewfinder display's colour rendering with the real scene without altering the camera's signal output, using a video processing circuit to control the gains of red, green, and blue signals based on the CIE1931 colour diagram.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the viewfinder uses a fixed colour temperature of 6500K, then the device structure is simple, but the colour rendering does not match the real scene under different lighting conditions
Solution Approach 1:
The viewfinder implements dynamic colour temperature adjustment by allowing continuous variation between 3000K and 9000K, enabling the display to adapt to different lighting conditions and match the real scene appearance, transforming a static display into a dynamic one that responds to environmental conditions
Solution Approach 2:
The invention changes the colour temperature parameter of the viewfinder display from a fixed value (6500K) to a variable parameter that can be continuously adjusted across a wide range (3000K-9000K), allowing operators to select the appropriate colour temperature to match different scene conditions
2Ease of operation
If the viewfinder colour temperature is adjusted to match the real scene, then the ease of operation improves, but the device complexity increases due to additional control circuits
Solution Approach 1:
The video processing circuit acts as an intermediary that receives the video signal and applies colour temperature adjustment through gain control of RGB signals, mediating between the fixed camera output and the variable viewfinder display requirements without affecting the original recorded signal
Solution Approach 2:
The invention applies colour temperature adjustment locally to the viewfinder display path only, using separate gain control for red, green, and blue signals in the video processing circuit, while leaving the camera's recorded signal unchanged, thus improving operation without globally altering the system
3Measurement precision
If the viewfinder allows continuous colour temperature adjustment, then the colour rendering accuracy improves, but the ease of manufacture decreases
Solution Approach 1:
The video processing circuit is designed to perform multiple functions: it processes the video signal for display while also providing colour temperature adjustment capability, and can potentially support other display parameters, making the circuit multi-functional and reducing the need for separate dedicated adjustment circuits
Data Source
Figure 1~2
AI summary
A viewfinder of an electronic camera includes a colour display monitor that is adapted to display a scene captured by an image sensor arrangement of the camera. The colour temperature of the viewfinder is continuously variable adjustable between a minimum and a maximum value. The colour temperature adjustment of the viewfinder does not affect the colour temperature of a video signal produced by the camera that is recorded or transmitted.