Camera Assembly Phase Difference Calculation via Pixel Block Segmentation
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Solution Overview
Problem
Existing dual-camera systems in smart terminals have limited photodiode pixel area, leading to inaccurate phase difference calculations and poor user experience in portrait tracking due to unclear images of subjects other than the face.
Innovation Solution
A camera assembly with a second camera comprising multiple pixel blocks, each formed of photosensitive pixels, captures a target portion using two parts of photosensitive pixels to form a global photodiode pixel, allowing for precise phase difference calculation and accurate focus adjustment via motors, enhancing sensitivity and focus accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the photodiode pixel area is kept small as in existing dual cameras, then the device complexity is reduced, but the measurement precision of phase difference calculation deteriorates
Solution Approach 1:
The second camera is divided into multiple pixel blocks, where each pixel block contains multiple photosensitive pixels. This segmentation allows the system to use only a first part of the photosensitive pixels to form a photodiode pixel for phase difference calculation, while the second part forms imaging pixels. This increases the area of the photodiode pixel without proportionally increasing the overall device complexity, as the pixel blocks are integrated into the existing camera structure.
2Measurement precision
If the photodiode pixel area is increased to enhance sensitivity, then the measurement precision of target portion tracking is improved, but the device complexity increases
Solution Approach 1:
The second camera serves multiple functions: it acts as both an imaging camera (using the second part of photosensitive pixels) and a phase difference detection camera (using the first part of photosensitive pixels to form the photodiode pixel). This multi-functionality allows the system to achieve enhanced sensitivity and tracking accuracy without adding a separate dedicated phase difference detection device, thereby limiting the increase in device complexity.
3Measurement precision
If only face area is used as focus area for calculating phase difference, then the device complexity is kept simple, but the measurement precision of portrait tracking deteriorates
Solution Approach 1:
Different parts of the second camera are assigned different functions: the first part of the photosensitive pixels in each pixel block is dedicated to forming photodiode pixels for phase difference calculation across the entire image area, while the second part is dedicated to imaging. This local differentiation allows the system to calculate phase difference for the entire portrait area rather than just the face area, improving portrait tracking accuracy without requiring complex additional processing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The increased photodiode pixel area and sensitivity enable clear imaging of target portions, improving user experience by ensuring quick focusing and accurate tracking of moving subjects.
Implementation Method 1
each pixel block being formed of a plurality of photosensitive pixels and being configured to obtain a first photodiode pixel by capturing a target portion of an object to be photographed through a first part of the plurality of photosensitive pixels
Data Source
AI summary
A camera assembly, a method for tracking a target portion based on the camera assembly, and an electronic device are provided. The camera assembly includes: a first camera; a first motor for driving the first camera to move; a second camera, comprising a plurality of pixel blocks each being formed of a plurality of photosensitive pixels and configured to obtain a first photodiode pixel by capturing a target portion of an object to be photographed through a first part of the plurality of photosensitive pixels and obtain a second photodiode pixel by capturing the target portion through a second part of the plurality of photosensitive pixels when the target portion is detected; a controller, configured to obtain a global photodiode pixel, calculate a phase difference and control the first motor to drive the first camera to move to an in-focus position according to the phase difference.