Digital Pan Tilt Zoom Camera Crop Synchronized Auto Focus
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Solution Overview
Problem
Digital Pan Tilt Zoom (DPTZ) cameras face challenges in quickly adjusting exposure and focus when switching between different crop regions of the sensor, leading to visible artifacts and suboptimal image quality due to the time required for adjustments.
Innovation Solution
Implementing a method for crop synchronized auto focus and exposure by receiving a command for a new crop region, obtaining new capture settings, capturing a frame according to these settings, and cropping it in real-time, allowing for instantaneous adjustments of sensor and motor settings to match the new region's conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the camera switches between different crop regions of the sensor, then the camera can capture different scenes or perspectives, but the exposure and focus adjustments take time causing visible artifacts and suboptimal image quality
Solution Approach 1:
The system performs preliminary calculations of new exposure and focus settings based on the relationship between old and new crop regions before the actual crop switch occurs. By pre-computing the required adjustments using the crop region transformation matrix, the camera can apply settings immediately when the crop switch happens, eliminating visible adjustment artifacts and achieving instantaneous adaptation to the new crop region.
2Measurement precision
If the camera performs exposure and focus adjustments after capturing a new scene, then the adjustments can be made based on actual scene conditions, but the adjustments take several seconds and are visible to the viewer
Solution Approach 1:
The system calculates preliminary exposure and focus settings before the crop switch based on the transformation relationship between crop regions. This allows the camera to have adjustment settings ready in advance, achieving both speed (instantaneous application) and precision (calculated based on scene conditions), eliminating the several-second delay that makes adjustments visible to viewers.
Solution Approach 2:
The system uses feedback from the crop region transformation matrix and historical capture settings to compute optimal new settings. By analyzing how the crop region changes and using this information to predict required exposure and focus adjustments, the system achieves accurate settings quickly without needing to wait for post-capture analysis.
3Productivity
If the camera uses digital crop instead of physical movement, then the camera can switch scenes instantly from one frame to the next, but the exposure and focus adjustments become more noticeable as artifacts
Solution Approach 1:
The system performs preliminary computation of exposure and focus settings based on the digital crop transformation before the crop switch is applied. By having the new settings calculated and ready in advance using the crop region relationship, the camera can switch scenes instantly via digital crop while simultaneously applying the pre-computed settings, making adjustments imperceptible to viewers.
Solution Approach 2:
The system replaces physical camera movement with digital crop switching, achieving instantaneous scene transitions. To eliminate the harmful artifacts that would normally result from this rapid switching, the system uses computational methods (pre-calculating settings based on crop transformation mathematics) to substitute for the gradual mechanical adjustments that would otherwise be visible.
Data Source
AI summary
Crop synchronized auto focus and exposure may be provided. First, a command corresponding to a new crop region of a sensor of a camera may be received. Then new capture settings corresponding to the new crop region may be obtained. Next, a frame may be captured from the sensor of the camera according to the obtained new capture settings. The captured frame may then be cropped according to the new crop region.