Variable Cutoff Filter Shaking Sensing for Extended Frequency Correction

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Solution Overview

Problem

Conventional shaking correction systems for photography devices are limited in correcting shaking frequencies outside the range of 4-15 Hz, leading to over-correction and unclear images when external vibrations or tripod-induced vibrations occur within lower or higher frequency ranges.

Innovation Solution

A shaking sensing unit with variable high pass and low pass filters, controlled by switching devices, allows for adjustable cutoff frequencies to accurately detect and correct shaking frequencies across a broader range, including low (0.01-8 Hz) and high (8-20 Hz) frequency ranges, ensuring appropriate correction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional shaking correction apparatus uses fixed high pass and low pass filters with cutoff frequencies set for 4-15 Hz range, then hand shaking correction is effective, but shaking correction capability is limited and over-correction occurs for vibrations outside this frequency range

Engineering Contradiction:

Improveshaking correction frequency rangeVSAvoidshaking detection accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent applies dynamics by making the filter cutoff frequencies adjustable rather than fixed. The high pass filter cutoff frequency can be dynamically changed based on the detected shaking frequency, allowing the system to adapt to different vibration ranges (0.01-8 Hz, 8-20 Hz, and 4-15 Hz) while maintaining accurate detection and correction capability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of filter cutoff frequencies according to the detected shaking frequency. When shaking frequency is detected to be in a specific range, the system adjusts the high pass and low pass filter cutoff frequencies accordingly, enabling accurate correction across extended frequency ranges without over-correction.

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If the photographing device is fixed on a rigid tripod, then stability is improved, but external impact and vibration are transferred and amplified, causing shaking frequencies outside the 4-15 Hz range

Engineering Contradiction:

Improvedevice stabilityVSAvoidexternal vibration transmission

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful effect of amplified vibrations from the rigid tripod into beneficial information for correction. By detecting the actual shaking frequency caused by tripod amplification and adjusting the filter cutoff frequencies accordingly, the system uses this harmful vibration pattern as input for accurate correction, turning the tripod's rigidity-induced vibrations into correctable data.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Speed

If the shaking sensing sensor reacts to all detected vibrations, then response speed is fast, but over-correction is performed for frequencies outside the natural hand shaking range, producing unclear images

Engineering Contradiction:

Improvecorrection response speedVSAvoidimage clarity

Core Design Contradiction:

SpeedVSManufacturing precision

Solution Approach 1:

The patent implements feedback by continuously monitoring the shaking frequency and using this information to adjust the filter cutoff frequencies. The system detects the actual vibration frequency, compares it with the natural hand shaking range (4-15 Hz), and adjusts the filters accordingly to provide appropriate correction feedback, preventing over-correction while maintaining fast response.

Inventive Principle:

Principle #23Feedback

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 system effectively corrects shaking frequencies outside the typical 4-15 Hz range, preventing over-correction and improving image clarity by dynamically adjusting filter settings based on detected frequency ranges.

Implementation Method 1

at least one sensor for sensing a rotation about at least one axis

Methodology Applied

Scientific EffectSensor detection:

Implementation Method 2

The high pass filter passes only a signal having a frequency not less than a cutoff frequency of the high pass filter

Methodology Applied

Scientific EffectFrequency filtering: Filter (electronic)

Implementation Method 3

The low pass filter passes only a signal having a frequency not greater than a cutoff frequency of the low pass filter and higher than the cutoff frequency of the high pass filter

Methodology Applied

Scientific EffectFrequency filtering: Filter (electronic)

Data Source

PatentUS7917022B2Shaking sensing and correction apparatus and method

Publication Date: 2011.03.29 SAMSUNG ELECTRONICS CO LTD

AI summary

A shaking sensing unit includes a sensor sensing a rotation about at least one axis, a high pass filter passing only a signal having a frequency not less than a cutoff frequency of the high pass filter, among electrical signals output from the sensor, and a low pass filter passing only a signal having a frequency not greater than a cutoff frequency of the low pass filter and higher than the cutoff frequency of the high pass filter, among the electrical signals output from the sensor. The cutoff frequency of the high pass filter and the cutoff frequency of the low pass filter are variably determined according to a shaking frequency.