Camera Device Single-Finger Zoom Control via Touch Screen
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Solution Overview
Problem
Current mobile phone camera systems require users to hold the device with one hand and use the other hand to gesture on the touch screen to adjust the focal length, which is inconvenient.
Innovation Solution
A method and apparatus that allow users to vary the focal length of a camera device by obtaining the position of one finger on the touch screen and calculating the image zooming multiple based on the finger's distance and direction of slide, enabling zooming of the image using that position as the center, allowing single-handed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two fingers are used to make stretch or pinch gestures on the touch screen to vary focal length, then the focal length can be adjusted, but the operation convenience deteriorates requiring two-handed operation
Solution Approach 1:
The patent divides the focal length adjustment function into two separate interaction modes: a first interaction mode for adjusting within a first focal length range, and a second interaction mode for adjusting within a second focal length range. This segmentation allows each mode to be optimized independently, with the first mode using simpler single-finger gestures and the second mode using two-finger gestures only when necessary, thereby improving overall operation convenience while reducing gesture complexity.
Solution Approach 2:
The patent dynamically switches between different interaction modes based on the current focal length. When the focal length is within the first range, the system activates the first interaction mode with single-finger gestures; when it exceeds the first range, the system switches to the second interaction mode with two-finger gestures. This dynamic adaptation allows the system to maintain optimal operation convenience across different focal length scenarios.
2Productivity
If two-finger stretch or pinch gesture is used to vary focal length, then focal length adjustment is achieved, but operation speed deteriorates due to complex gesture requirements
Solution Approach 1:
The patent segments the focal length adjustment into two distinct ranges, each with its own interaction mode. The first range uses simple single-finger sliding gestures for quick adjustment, while the second range uses two-finger gestures. This segmentation enables faster operation for the most common focal length adjustments (within the first range) while maintaining the ability to adjust extreme focal lengths when needed.
Solution Approach 2:
The patent applies different gesture complexities to different focal length ranges. The first focal length range (which likely covers the most commonly used zoom levels) is accessed through simple single-finger gestures, while the second range (extreme zoom levels) requires two-finger gestures. This local optimization ensures that the majority of operations are performed quickly and easily.
Data Source
AI summary
The present disclosure discloses a method and an apparatus for varying a focal length of a camera device, and a camera device capable of varying a focal length thereof. The method includes: obtaining a position where one finger of a user touches a touch screen of the camera device; obtaining an image zooming multiple according to a distance and a direction that the finger of the user slides on the touch screen of the camera device; and zooming, according to the image zooming multiple and by using the position on the touch screen of the camera device where the finger of the user touches the touch screen of the camera device as a center, an image currently taken by the camera device, so as to vary a focal length of the camera device. The apparatus includes: a first obtaining module, a second obtaining module, and a zooming module.