Mobile Camera Preview Motion Compensation
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Solution Overview
Problem
Mobile computing devices with digital cameras face challenges in accurately aiming the imaging device due to noticeable time lags between capturing and displaying preview frames, leading to increased power consumption and reduced battery life, as users struggle to align the device with the target object.
Innovation Solution
The mobile computing device is configured with a motion sensor, such as an accelerometer or gyroscope, to detect movement and transform the preview image frame through pixel shifts, rotations, and scaling, ensuring the displayed image reflects the current aiming direction of the device, and optionally introduces a colored polygon to minimize visual disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the preview image frame is displayed with a time lag between capturing and displaying, then the processing time is reduced, but the aiming accuracy deteriorates
Solution Approach 1:
The motion sensor continuously detects device movement in advance, and the processor calculates compensation transformations before the preview image is displayed. This preliminary detection and calculation of movement allows the system to pre-compensate for device motion, ensuring the preview image accurately reflects the current aiming direction despite processing delays.
2Measurement precision
If the preview image frame is processed to compensate for device movement, then the aiming accuracy is improved, but the power consumption increases
Solution Approach 1:
The motion sensor continuously monitors device movement and automatically provides movement data to the processor. The system uses its own operational data (device movement) to self-correct the preview image compensation, eliminating the need for external intervention or complex additional processing, thereby reducing overall power consumption while maintaining accuracy.
3Measurement precision
If the preview image frame is transformed to reflect current aiming direction, then the aiming accuracy is improved, but the visual disturbance increases
Solution Approach 1:
The colored polygon is introduced at the specific location where visual disturbance occurs due to image transformation. By applying a localized visual element (the colored polygon) at the boundary or area of transformation, the system masks the disruptive effects of image warping or shifting only where necessary, preserving overall image quality while eliminating localized visual artifacts.
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
This solution enhances user accuracy in aiming the device, reduces power consumption, and extends battery life by providing a quasi-real-time preview that compensates for device movement, thereby improving the overall imaging experience.
Implementation Method 1
at least one motion sensor can be provided by an accelerometer
Implementation Method 2
at least one motion sensor can be provided by an gyroscope
Implementation Method 3
an imaging lens configured to focus an image of a target object on the image sensor
Implementation Method 4
a two-dimensional image sensor and an imaging lens configured to focus an image of a target object on the image sensor
Data Source
AI summary
A mobile computing device can comprise a microprocessor, a display, at least one motion sensor, and an imaging device including a two-dimensional image sensor and an imaging lens configured to focus an image of a target object on the image sensor. The mobile computing device can be configured to periodically display a preview image frame of the target object. The mobile computing device can be further configured to compensate for a movement of the imaging device relatively to the target object during a time period elapsed between taking and displaying the preview image frame, by transforming the preview image frame based on the device movement detected by the motion sensor.