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| A diagram from the patent that details the process of integrating multiple image stabilization systems together. |
Canon has patented a new image stabilization system that utilizes three different technologies to prevent blurry images: lens stabilization, image sensor stabilization and electronic image stabilization. The system would add another layer of movement prevention over Canon’s existing dual image stabilization option that uses both lens and digital stabilization when shooting in video mode.
The patent was first posted on the United States Patent and Trademark Office’s website (USPTO) on June 27. According to the document, Canon’s triple image stabilization system, which uses a combination of lens, sensor and electronic image stabilization technologies, kicks in to prevent slow shutter speed blurs that may otherwise exceed the capabilities of the current Dual IS system.
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Canon splits camera shakes into two different categories: low-frequency for slight movements that can be corrected using electronic stabilization and high-frequency for stronger shakes like the vibration from a moving vehicle that can be corrected using optical stabilization.
The patent details a third type of movement Canon called ’accumulated shake’ resulting from low shutter speeds experienced in dim environments. In the case of recording in low-light situations, Canon explains:
…so-called ‘accumulated shake’ may occur, which is a blur occurring in a subject image due to the position at which an optical image is formed being displaced during exposure, and therefore, it may be impossible to acquire a favorable image even if a region that is to be cut out is adjusted.
It appears Canon patented this new system as a potential solution for this problem; the patent explains the system offers ‘favorable shake correction corresponding to the shutter speed.’ Based on the details provided in the patent, Canon may envision future cameras that utilize a detection method for determining when accumulated shake is a problem in order to utilize the triple image stabilization system.
The feature may be used to reduce blurs in videos recorded in low-light settings, but only speculation about Canon’s intentions is possible at this time. As with any patent, Canon may never bring this technology to the consumer market.
Articles: Digital Photography Review (dpreview.com)