Defocused Background Generation via Preview Image Analysis
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Solution Overview
Problem
Current digital photographing devices struggle to achieve a desirable defocused background effect due to limitations in sensor and aperture size, requiring multiple images for post-processing and being sensitive to environmental light, with techniques like flash affecting the outcome and requiring significant calculations.
Innovation Solution
An apparatus and method for generating an image with a defocused background, involving a background distribution extraction unit, a defocused image generation unit, and an image combination unit, which extract and combine background and foreground elements based on preview images, using binarization and smoothing processes to create the desired effect without needing multiple images and improving adaptability to lighting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If post digital process is used to simulate defocused background effect, then the effect can be achieved, but multiple images need to be photographed which causes inconvenience for the user
Solution Approach 1:
The patent extracts background distribution information during the preliminary preview image capture stage, before the final photograph is taken. This preliminary extraction of background probability distribution data eliminates the need for subsequent multiple image capture and processing steps, directly resolving the user inconvenience while maintaining the defocused background effect.
2Adaptability or versatility
If flash matting technology is used, then background defocusing effect can be achieved, but the effect is limited by the influence of the flash on the photographed object
Solution Approach 1:
The patent extracts and utilizes only the background distribution information from the preview image, separating the background processing from the flash-related foreground processing. By extracting background probability distribution independently, the system achieves defocused background effect without being constrained by flash influence on the photographed object, thereby improving lighting condition adaptability.
3Manufacturing precision
If depth from defocus technique is used, then background defocusing effect can be achieved, but a relatively large calculation amount is required which is not desirable
Solution Approach 1:
The patent uses a simplified copying approach by extracting background distribution probability information directly from the preview image, rather than performing complex depth calculation. This copying of background distribution data enables the system to achieve the defocused background effect with significantly reduced calculation complexity and improved processing efficiency.
Data Source
AI summary
Provided are an apparatus and method for generating an image with a defocused background. According to various aspects, a preview image is used as the basis for extracting a background distribution and a defocused background is generated based on the extracted background distribution. Accordingly, it is not necessary to photograph two or more images to generate a defocused background effect.