Image Stabilization Controller Follow Shot Angular Velocity Correction
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Solution Overview
Problem
Existing image stabilization systems for follow shots in photography face challenges in accurately determining the main object and maintaining stability when the object's speed changes, leading to potential camera shake due to incorrect speed detection and error correction.
Innovation Solution
A control apparatus that includes an image stabilization controller and a calculator to determine the follow shot angular velocity based on outputs from a shake detector and motion vector detector, deciding whether to drive the image stabilizer to correct for any angular velocity differences, thereby preventing camera shake during exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the image stabilizer is driven to correct follow shot speed errors, then the main object stability is improved, but false recognition of the main object causes adverse camera shake
Solution Approach 1:
The system uses feedback from the shake sensor and motion vector detector to continuously monitor and adjust the follow shot speed. By comparing the detected motion vector with the camera's actual movement, the system dynamically corrects speed errors while preventing false corrections through continuous verification of object tracking accuracy
Solution Approach 2:
The patent introduces an intermediary verification mechanism that checks whether the detected main object is correctly identified before applying speed error corrections. This intermediary step prevents false recognition from causing adverse shake by validating the target object's identity and position before executing stabilization corrections
2Illumination intensity
If a slow shutter speed is used to capture follow shot images, then the dynamism of the object is expressed, but camera shake is likely to occur
Solution Approach 1:
The image stabilizer acts as a counterweight to the camera shake that occurs during slow shutter speed exposure. By detecting the shake through the shake sensor and driving the stabilizer in the opposite direction, the system compensates for the instability introduced by slow shutter speeds, allowing long exposures to capture object dynamism without suffering from camera shake
3Measurement precision
If the follow shot speed error correction is applied, then the follow shot accuracy is improved, but incorrect main object detection causes object shake
Solution Approach 1:
The system performs preliminary verification of main object detection before applying follow shot speed error corrections. By checking the validity and consistency of the detected main object in advance, the system prevents incorrect corrections that would cause object shake, ensuring that speed adjustments are only applied when the target is reliably identified
Data Source
AI summary
A control apparatus includes an image stabilization controller configured to control an image stabilization of an optical apparatus by driving an image stabilizer, and a calculator configured to calculate a follow shot angular velocity for following an object based on an output from a shake detector configured to detect a shake applied to the optical apparatus and an output from a motion vector detector configured to detect a motion vector representing motion of the object. The image stabilization controller determines whether to drive the image stabilizer depending on a difference between the follow shot angular velocity and an angular velocity of the optical apparatus acquired based on the output from the shake detector.