Image Capturing Device Compression Rate Prediction
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Solution Overview
Problem
Existing image capturing devices face challenges in accurately and efficiently controlling the compression rate during continuous image capturing, leading to deviations from target data volumes and low prediction accuracy, especially when capturing irregular images or with significant movement between frames.
Innovation Solution
An image capturing device and method that utilize an intra-frame predictive coding system, incorporating a current compression rate derivation unit, a subsequent compression rate prediction unit, and a correction factor derivation unit to accurately predict and adjust the compression rate based on past compression rates, using averaging, difference values, or variation rates to ensure data volume alignment with target values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a preset target compression rate is used in the compression coding process, then the compression coding can be performed efficiently, but the actual compression rate greatly deviates from the target compression rate for some image data
Solution Approach 1:
The patent implements a feedback mechanism where the actual compression rate of previously compressed image data is measured and used to adjust the compression rate for subsequent image data. The compression rate control unit derives actual compression rates from sequentially compressed image data and uses this feedback to dynamically adjust the compression rate, ensuring it converges toward the target compression rate while maintaining coding efficiency.
Solution Approach 2:
The patent transforms the static preset compression rate into a dynamic adjustment mechanism. The compression rate control unit continuously monitors actual compression rates and dynamically modifies the compression rate for subsequent images based on deviations from the target rate, allowing the system to adapt to varying image characteristics while maintaining overall compression efficiency.
2Measurement precision
If the compression rate is adjusted to correct deviations, then the compression accuracy improves, but the processing time increases due to iterative compression coding
Solution Approach 1:
The patent performs preliminary compression coding with a preset compression rate before final compression. This preliminary action allows the system to quickly process image data initially, then use the results to inform subsequent compression adjustments, reducing the overall time penalty of iterative refinement.
Solution Approach 2:
The patent maintains continuous compression coding operations by processing image data in sequence rather than stopping for iterative adjustments. The compression rate is adjusted continuously based on actual rates from previous images, allowing the useful action of compression to proceed without interruption while still achieving accuracy improvements.
3Manufacturing precision
If iterative compression coding is performed to hold data volume within desired range, then the data volume control accuracy improves, but the processing speed decreases
Solution Approach 1:
The patent uses feedback from actual compression rates of previously compressed images to adjust the compression rate for subsequent images. This feedback mechanism allows the system to achieve accurate data volume control by learning from past compression results, reducing the need for extensive iterative adjustments and thereby improving processing speed.
Solution Approach 2:
The patent performs preliminary compression with a preset rate to establish a baseline, then uses this preliminary result to guide subsequent compression adjustments. This approach allows the system to achieve accurate data volume control with fewer iterations, maintaining higher processing speed while improving precision.
4Productivity
If only the compression rate of immediately preceding image data is used for prediction, then the processing is simple and fast, but the prediction accuracy is low when irregular images are captured or movement amount is great
Solution Approach 1:
The patent implements a dynamic prediction mechanism that adapts to varying image characteristics. Rather than using a fixed prediction method, the system adjusts its prediction approach based on the actual compression rates of multiple previous images, allowing it to maintain accuracy even when image content changes significantly or irregular images are captured.
Solution Approach 2:
The patent performs preliminary compression coding on multiple sequentially captured images to gather compression rate data before making predictions. This preliminary action on multiple images provides a more robust basis for prediction, improving accuracy when irregular images or significant movement occur, while still maintaining relatively fast processing through efficient data utilization.
Data Source
AI summary
An image capturing device (100) is provided with: an image capturing unit (102) which generates, by continuous image capturing, a plurality of pieces of image data which are continuous in the time direction; an image processing unit which corrects a compression rate of the image data on the basis of a correction factor for correcting the image data, and performs compression coding by use of an intra-frame predictive coding system; a data control unit (124) which stores the image data, which has been subjected to the compression coding, in an image storage unit; a current compression rate derivation unit (130) which derives a current compression rate which is an actual compression rate of the image data which has been subjected to the compression coding; a current compression rate holding unit (132) which holds a plurality of current compression rates continuous in the time direction; a subsequent compression rate prediction unit (134) which predicts a subject compression rate, which is a compression rate of image data to be subjected to the subsequent compression coding next time, from the plurality of current compression rates which are held, or from the plurality of current compression rates which are held and the compression rate of the image data to be subjected to the current compression coding this time; and a correction factor derivation unit which derives the correction factor on the basis of the subsequent compression rate.