Image Sensor–ISP Synchronization via Capture Configuration Metadata
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Solution Overview
Problem
Synchronizing changes in settings between image sensors and image signal processors is difficult, leading to reduced image quality and lost frames due to timing errors.
Innovation Solution
Incorporating a capture configuration identifier into image data, allowing the image signal processor to reconfigure stages based on metadata, ensuring synchronization with image sensor changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If configuration changes are made to image sensor settings, then image capture performance is improved, but timing errors between sensor and processor cause reduced image quality and lost frames
Solution Approach 1:
The image sensor embeds a capture configuration identifier in the image data before transmitting to the processor. This preliminary action allows the processor to know in advance what configuration changes have been made, enabling it to synchronize its processing stages proactively rather than reactively, thus preventing timing errors and maintaining image quality.
Solution Approach 2:
The capture configuration identifier acts as feedback information that travels with the image data from sensor to processor. This feedback mechanism enables the processor to continuously monitor and adapt to configuration changes, ensuring that processing parameters remain synchronized with sensor settings throughout operation.
2Reliability
If configuration synchronization between image sensor and processor is implemented, then image quality is maintained, but system complexity increases due to additional coordination mechanisms
Solution Approach 1:
The capture configuration identifier serves as an intermediary element that carries configuration information between the image sensor and processor. Rather than implementing complex direct communication protocols or handshaking mechanisms, this intermediate data structure simplifies the synchronization process by embedding all necessary configuration information within the existing image data stream.
Solution Approach 2:
The capture configuration identifier performs multiple functions simultaneously: it identifies configuration changes, triggers processor reconfiguration, and provides a reference for synchronizing processing stages. This multi-functionality reduces the need for separate synchronization mechanisms, thereby lowering overall system complexity while maintaining reliable image quality.
Data Source
AI summary
This disclosure provides systems, methods, and devices for image signal processing that support synchronizing configurations between an image sensor and an image signal processor (ISP). In a first aspect, a method of image processing includes, for each stage of an ISP pipeline, configuring processing in the stage based on metadata in the image data from the image sensor. For example, a capture configuration identifier associated with an image frame may be used to reconfigure the ISP stage, such that the ISP stage configuration is updated in synchronization with image data received from an image sensor that has changed configurations. Other aspects and features are also claimed and described.