Image Synthesis Brightness Uniformity via Reference Selection
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Solution Overview
Problem
Existing image synthesis techniques fail to address uneven brightness issues in synthetic images generated from continuously captured images, particularly when stroboscopic flash affects exposure, leading to inconsistent brightness in the final synthesized result.
Innovation Solution
An image synthesizing apparatus and method that selects a reference image for brightness, detects images with significant brightness differences using a predetermined threshold, sets a synthetic rate based on these differences, and generates a synthetic image by adjusting the blending of images to minimize uneven brightness through a transparency intensity map.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If additive synthesis is executed on continuously captured images, then sufficient brightness for recording is generated, but uneven brightness remains in the synthetic result when stroboscopic flash affects exposure
Solution Approach 1:
The patent applies local quality by detecting brightness differences at the pixel level between the reference image and other captured images. Each pixel is evaluated individually to determine its brightness deviation, allowing the system to identify and exclude specific pixels with abnormal brightness (caused by stroboscopic flash) while maintaining normal brightness areas. This localized evaluation enables precise control over which pixels contribute to the final synthetic image, resolving the contradiction between achieving sufficient brightness and maintaining brightness uniformity.
Solution Approach 2:
The patent implements feedback by comparing each captured image against a reference image and using the brightness difference detection to adjust the synthetic rate. The detection unit provides feedback information about brightness deviations, which the setting unit then uses to determine the appropriate synthetic rate for incorporating each image. This closed-loop feedback mechanism ensures that images with excessive brightness variation (due to flash) are appropriately weighted or excluded, maintaining overall brightness uniformity while preserving sufficient light levels for recording.
2Productivity
If images with uneven brightness are included in additive synthesis, then more image data is processed, but the synthetic result contains residual brightness differences and picture ghosting
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the synthetic rate based on detected brightness differences. Instead of using a fixed synthesis weight for all images, the system modifies the synthetic rate parameter according to the brightness deviation of each image relative to the reference. Images with larger brightness differences receive adjusted synthetic rates that reduce their influence on the final result. This parameter adaptation allows the system to process multiple images efficiently while maintaining brightness consistency, as the synthetic rate automatically compensates for brightness variations.
Data Source
AI summary
An image capturing unit 1 acquires a plurality of images being temporally continuous. Based on external operations from a key input unit 4, a control unit 9 selects an image serving as reference of synthesis, from the plurality of images acquired by the image capturing unit 1. An image processing unit 10 compares the reference image selected by the key input unit 4 with other images acquired by the image capturing unit 1, and detects an image with a difference value being higher than a predetermined threshold value as a result of such comparison. The image processing unit 10 sets a synthetic rate, based on the image thus detected. A synthesis unit 11 generates a single image by executing synthesis of the plurality of acquired images including the image serving as reference, by using the synthetic rate that is set by the image processing unit 10.