Depth Sensing Duty Cycle Correction for Accurate Image Data
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Solution Overview
Problem
Current image sensing devices face challenges in accurately correcting depth information, which is crucial for capturing images, due to inconsistencies in duty cycles of signals used for emitting light and measuring depth, leading to errors in image data generation.
Innovation Solution
The proposed image sensing device incorporates a corrector with a duty cycle correction circuit that generates first and second cycle signals with adjustable duty cycles based on control signals and a clock signal, using a delay circuit, logic circuit, and selection circuit to correct duty cycle differences, enabling precise depth information correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If duty cycle correction circuit is added to generate first and second cycle signals with adjustable duty cycles, then depth information accuracy is improved, but device complexity increases
Solution Approach 1:
A duty cycle correction circuit is introduced as an intermediary component between the light driver and pixel driver. This circuit receives a first cycle signal, adjusts its duty cycle based on a control signal, and generates a second cycle signal with the corrected duty cycle. The intermediary circuit resolves the duty cycle inconsistency that would otherwise directly affect depth measurement accuracy, thereby improving measurement precision while isolating the complexity to a dedicated correction module.
Solution Approach 2:
The duty cycle correction circuit dynamically changes the duty cycle parameter of the first cycle signal to generate the second cycle signal. By adjusting the duty cycle parameter based on a control signal, the system compensates for duty cycle inconsistencies between light emission and depth measurement operations. This parameter adjustment mechanism enables accurate depth information extraction without requiring fundamental changes to the overall system architecture.
2Manufacturing precision
If duty cycle of first cycle signal is adjusted to match second cycle signal, then image data quality is improved, but signal generation complexity increases
Solution Approach 1:
The system employs a feedback mechanism where the duty cycle correction circuit receives a control signal that indicates the duty cycle inconsistency between the first and second cycle signals. Based on this feedback, the correction circuit adjusts the duty cycle of the first cycle signal to match the second cycle signal. This closed-loop feedback approach ensures image data quality by eliminating duty cycle mismatches while using a relatively simple adjustment mechanism rather than complex signal generation logic.
Data Source
AI summary
An image sensing device includes an image sensor suitable for correcting depth information based on a control signal, and for generating image data according to the depth information, and a controller suitable for analyzing an error of the depth information, and for generating the control signal, based on first and second cycle signals provided from the image sensor.