Image Sensor Sub-pixel HDR and Phase Detection Autofocus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image sensors struggle to capture high dynamic range (HDR) images with improved focus control, particularly in varying light conditions, as they require separate processes for image capture and focus adjustment, which can be inefficient and affect image quality.
Innovation Solution
A control system for image capture devices featuring an image sensor with sub-pixels configured for different exposures, where one set captures HDR images and another set provides focus data for adjusting the focus, allowing simultaneous HDR image capture and focus control using a phase-detection autofocus process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate processes are used for image capture and focus adjustment, then image quality can be maintained, but processing efficiency deteriorates and overall performance is reduced
Solution Approach 1:
The patent combines HDR image capture and focus adjustment processes by using the same image sensor and processing circuitry for both functions. The image sensor captures images with different exposure times, and the processing circuitry simultaneously performs HDR processing and phase detection autofocus, eliminating the need for separate processes and improving processing efficiency while maintaining image quality.
2Device complexity
If the same image sensor is used for both HDR capture and focus detection, then device complexity is reduced, but measurement precision for focus may deteriorate
Solution Approach 1:
The patent segments the image sensor into different pixel regions with specific functions. Some pixels are configured for HDR capture with different exposure times, while other pixels are designated for phase detection autofocus. The processing circuitry then processes signals from these segmented regions separately to achieve both HDR imaging and precise focus detection simultaneously.
3Reliability
If multiple exposure times are used for HDR imaging, then image quality in varying light conditions improves, but processing time increases
Solution Approach 1:
The patent implements continuous image capture at multiple exposure times without interrupting the imaging process. The image sensor continuously captures images with different exposure times, and the processing circuitry continuously processes these images to generate HDR output. This continuous operation eliminates the need for separate capture and processing stages, reducing overall processing time while maintaining high image quality.
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
This solution enables improved image quality by capturing detailed images in both bright and dark conditions while maintaining accurate focus, enhancing the overall performance of image capture devices by integrating HDR image capture and focus adjustment processes.
Implementation Method 1
sensor pixels of the array of sensor pixels comprising at least two sub-pixels respectively... a first plurality of the sensor sub-pixels are configured to capture first pixel data with a first exposure; and a second plurality of the sensor sub-pixels are configured to capture second pixel data with a second exposure different from the first exposure
Data Source
AI summary
A control system for an image capture device. The control system includes an image sensor including sensor pixels including at least two sub-pixels respectively. First and second pluralities of the sensor sub-pixels capture first and second pixel data with a first and second exposure respectively. An image processor receives image data derived from a first set of the sensor sub-pixels including sub-pixels of the first and second pluralities of the sensor sub-pixels. On the basis of the image data, the image processor generates output data representing at least part of an output image. A focus controller receives focus data derived from a second set of the sensor sub-pixels including at least two of the first plurality of the sensor sub-pixels. On the basis of the focus data, the focus controller generates a control signal for adjusting a focus of the image capture device. Other examples relate to image sensors.