Single Image Sensor Parallel Video Signal Generation
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Solution Overview
Problem
Existing image capture devices face delays in acquiring final captures due to the sequential nature of automatic exposure and focus processing, which restricts the frame rate and increases complexity with dual image sensors.
Innovation Solution
A method utilizing a single two-dimensional image sensor to generate two video signals at different frame rates, allowing simultaneous processing for preview, autofocus, and exposure adjustment, thereby reducing the time between initiating capture and acquiring the final image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single electronic image sensor is used for multiple functions (AE processing, AF processing, and visual image creation), then device complexity is reduced, but the processing rate is restricted due to sequential operations
Solution Approach 1:
The patent divides the sensor output into multiple video signals by separating pixel groups. A first group of pixels is read out for AE/AF processing at high frame rates, while a second group provides visual image data. This segmentation allows parallel processing of different functions simultaneously, resolving the contradiction between using a single sensor and maintaining high processing rates.
2Device complexity
If AE processing and AF processing are performed sequentially from the same sensor, then device complexity is minimized, but considerable time delay occurs between capture initiation and final acquisition
Solution Approach 1:
The patent enables continuous simultaneous operation of AE processing, AF processing, and visual image creation by reading out different pixel groups concurrently. The first video signal for AE/AF and the second video signal for visual imaging are generated continuously in parallel, eliminating the sequential time delays that would otherwise occur.
3Speed
If two image sensors are used to provide fast frame rate for AE/AF processing and slow frame rate for visual image, then processing speed is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes a single sensor perform multiple functions by dividing its pixel array into different groups. The same sensor simultaneously provides high-speed data for AE/AF processing and standard-speed data for visual imaging, eliminating the need for separate sensors while maintaining the required frame rates for each function.
Data Source
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AI summary
A method for using a capture device to capture at least two video signals corresponding to a scene, includes: providing a two-dimensional image sensor having a plurality of pixels; reading a first group of pixels from the image sensor at a first frame rate to produce a first video signal of the image scene; reading a second group of pixels from the image sensor at a second frame rate for producing a second video signal; and using at least one of the video signals for adjusting one or more of the capture device parameters.