Depth Detection Apparatus Signal Correction Filter
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current depth detection methods in digital cameras face accuracy drops due to image signal profile changes and fluctuating conversion coefficients, leading to increased processing time and reduced measurement speed.
Innovation Solution
A depth detection apparatus and method that uses a signal processing unit to filter image signals and calculate shift amounts, employing image signal correction filters based on optical transfer functions and pupil transmittance distributions to stabilize signal profiles and adjust for defocus, thereby reducing calculation errors and enhancing precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If image signal correction filtering is performed to improve depth measurement accuracy, then measurement precision is improved, but processing time increases and productivity decreases
Solution Approach 1:
The patent performs image signal correction filtering in advance before depth measurement computation. By pre-processing the image signals to correct profile differences caused by vignetting and pixel sensitivity variations, the system prepares the data in advance, which reduces the computational burden during the actual depth measurement process and enables faster processing without sacrificing accuracy.
Solution Approach 2:
The patent extracts and corrects only the essential profile characteristics of image signals by generating correction filters based on optical transfer functions and pupil transmittance distributions. This selective approach focuses computational resources on correcting the most critical signal distortions rather than performing comprehensive processing, thereby improving accuracy while maintaining speed.
2Measurement precision
If conversion coefficient is calculated according to defocus amount to reduce calculation error, then measurement precision is improved, but processing time increases and productivity decreases
Solution Approach 1:
The patent calculates the conversion coefficient in advance based on the defocus amount before performing the actual depth measurement computation. By pre-computing the conversion coefficient according to the specific defocus conditions, the system eliminates the need for complex real-time calculations during depth measurement, thereby improving accuracy while maintaining high processing speed.
3Measurement precision
If both image signal correction processing and conversion coefficient calculation processing are performed, then measurement precision is improved, but processing time increases and productivity decreases
Solution Approach 1:
The patent performs both image signal correction filtering and conversion coefficient calculation in advance before the actual depth measurement computation. By pre-processing the image signals and pre-calculating the conversion coefficients based on defocus amounts, the system prepares all necessary correction data in advance, which significantly reduces the processing time during the actual depth measurement while maintaining high precision.
Solution Approach 2:
The patent divides the processing into distinct stages: first performing image signal correction filtering to correct profile differences, then calculating the conversion coefficient based on defocus amount, and finally performing the depth measurement computation. This segmentation allows each processing step to be optimized independently and executed efficiently, reducing overall processing time while maintaining accuracy.
Data Source
Figure 1A~1C
Figure 2A~2C
Figure 3A~3B
AI summary
A depth detection apparatus that detects depth information on a depth to an object on the basis of first and second signals corresponding to first and second pupil regions of an exit pupil, including: a first calculation unit that calculates a first shift amount between the first and second signals; a signal processing unit that generates a corrected signal by performing filter processing on at least one of the first and second signals, the filter processing being performed to relatively displace the first and second signals by a displacement amount corresponding to the first shift amount; and a second calculation unit that calculates a second shift amount between the filtered first and second signals or between signals, one of which is filtered in the filter processing and the other one of which is unfiltered.