Imaging Device Compression Ratio Control for Frame Rate Stability
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Solution Overview
Problem
Existing imaging devices face challenges in maintaining a consistent frame rate due to fluctuations in brightness of the subject's environment, leading to increased image blurring and inefficient compression, especially in communication terminal devices with small camera sensors.
Innovation Solution
An imaging device that calculates light quantity information including shutter speed and gain value, and uses this information to determine a dynamic compression ratio for frame-based compression, thereby stabilizing the code amount per frame and maintaining a consistent frame rate across varying brightness conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the signal input time is extended to improve image quality in dark environments, then the original signal strength increases, but hand movement causes significant image blurring
Solution Approach 1:
The patent applies dynamics by making the compression ratio adjustable and adaptive rather than fixed. The compression ratio is dynamically changed based on the brightness of the subject's environment, allowing the system to optimize between image quality and frame rate stability in real-time different lighting conditions
Solution Approach 2:
The patent changes the compression ratio parameter according to the brightness conditions. In dark environments, a lower compression ratio is used to maintain image quality, while in bright environments, a higher compression ratio is applied to control code amount and maintain stable frame rate
2Device complexity
If a fixed compression ratio is used to simplify processing, then device complexity is reduced, but frame rate fluctuates markedly with brightness changes
Solution Approach 1:
The system transitions from a static fixed compression ratio to a dynamic adaptive compression ratio that automatically adjusts based on environmental brightness, stabilizing frame rate without requiring complex image processing
Solution Approach 2:
The patent implements feedback control by monitoring the brightness of the subject's environment and using this information to adjust the compression ratio accordingly. This feedback mechanism maintains stable frame rate by compensating for brightness-induced code amount fluctuations
3Productivity
If image processing is performed on the whole inputted image to optimize compression, then compression efficiency improves, but processing load becomes high
Solution Approach 1:
The patent extracts only the essential parameter (brightness of subject's environment) needed for compression ratio determination, avoiding complex processing of the entire image. This selective extraction approach maintains compression efficiency while significantly reducing processing load
Solution Approach 2:
Instead of processing the entire image, the system changes the compression ratio parameter based on brightness information, achieving efficient compression with minimal processing by focusing on a single key parameter
Data Source
AI summary
There is provided an imaging device capable of suppressing fluctuations in frame rate due to brightness of a subject's environment.The imaging device includes: imaging units (1, 2) for taking an image of a subject, to acquire image data; a compression unit (3) for compression in frame units the image data acquired by the imaging units (1, 2); a light quantity information calculation unit (2) for calculating light quantity information including a shutter speed and a gain value, based on the image data acquired by the imaging units (1, 2); and compression ratio determination units (5, 6) for determining a compression ratio for compression in frame units by the compression unit (3), based on the light quantity information calculated by the light quantity information calculation unit (2), characterized in that the compression unit (3) compresses the image data in frame units based on the compression ratio determined by the compression ratio determination units (5, 6).