Video Signal Block Segmentation for Viewfinder Focus Adjustment
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Solution Overview
Problem
Current image pickup systems face challenges in accurately performing focus adjustment while viewing local video displayed on a viewfinder, as the existing methods are insufficient for high-resolution cameras like 4K.
Innovation Solution
The system includes an image pickup unit, a first video signal processing unit generating a high-resolution signal, a second video signal processing unit that segments and downconverts the signal into smaller blocks for display on a viewfinder, and a control unit for user-controlled block movement, allowing for improved focus adjustment by displaying a lower resolution video signal with emphasized outlines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution video signal is displayed on view finder, then image quality is improved, but focus adjustment accuracy deteriorates
Solution Approach 1:
The high-resolution video signal is divided into multiple blocks, and only selected blocks are displayed on the view finder. This segmentation allows the system to present a simplified view for focus adjustment while maintaining the full high-resolution signal for recording, resolving the contradiction between display simplicity and image quality.
Solution Approach 2:
Different processing is applied to different regions of the video signal. The view finder display uses downsampled or selectively displayed blocks for simplified focus assessment, while the full high-resolution signal is preserved for the main recording, allowing each region to have optimized quality for its specific purpose.
2Manufacturing precision
If full high-resolution video is processed, then image quality is improved, but processing time increases
Solution Approach 1:
Instead of processing the entire high-resolution video signal for view finder display, only selected blocks are extracted and displayed. This partial action reduces processing time and enables faster focus adjustment while maintaining sufficient quality for focus assessment in the displayed blocks.
3Productivity
If video signal is downconverted for view finder, then processing speed is improved, but display quality deteriorates
Solution Approach 1:
The video signal is segmented into blocks, and the system displays selected blocks on the view finder. This segmentation allows efficient processing of individual blocks while maintaining sufficient detail for focus assessment, balancing processing speed with focus recognition accuracy.
Solution Approach 2:
The block selection and display mechanism acts as an intermediary between the full high-resolution signal and the view finder display. It processes only necessary blocks at reduced resolution, providing sufficient detail for focus adjustment while maintaining high processing speed.
Data Source
AI summary
This image pickup apparatus includes: an image pickup unit including an image pickup element; a first video signal processing unit that generates a first video signal having a first resolution from a pixel signal obtained by the image pickup unit; a second video signal processing unit that sets a plurality of divided areas for spatially segmenting the first video signal generated by the first video signal processing unit, cuts out the first video signal in a region smaller than a size of the corresponding divided area as a block from the first video signal in each of the individual divided areas, and connects them to one another, to thereby generate a second video signal having a second resolution lower than the first resolution; and a view finder that displays the second video signal.