Change Image Detection via Partial Region Comparison
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Solution Overview
Problem
Existing moving image display systems take a long time to detect and transmit changes between images due to the slow operation of VRAM, which is exacerbated by comparing entire frame images rather than partial regions, leading to inefficiencies in data transmission and potential mismatches in displayed images.
Innovation Solution
A change image detecting device that compares partial regions of images with corresponding regions in a reference image, determining changes within these regions to quickly identify and transmit only the changed data, thereby reducing the time required for detection and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If entire frame images are compared to detect changes, then detection accuracy is improved, but detection time increases significantly
Solution Approach 1:
The patent divides the frame image into multiple blocks (e.g., 16x16 pixel blocks) and performs change detection on each block independently. This segmentation allows the system to compare only relevant portions of images rather than entire frames, significantly reducing detection time while maintaining accuracy through systematic coverage of all image regions.
Solution Approach 2:
The patent implements partial action by comparing only those blocks that may contain changes rather than processing every pixel in the entire frame. By using motion vectors to identify candidate blocks and selectively comparing only those regions, the system achieves efficient change detection without the computational overhead of full-frame comparison.
2Measurement precision
If frame images are captured sequentially from VRAM to general-purpose memory for comparison, then comprehensive change detection is achieved, but transmission time increases due to VRAM operation speed
Solution Approach 1:
The patent performs preliminary change detection processing directly on blocks within VRAM using motion vector information before transferring data to general-purpose memory. By pre-identifying changed blocks and preparing comparison data in advance within VRAM, the system reduces the amount of data that needs to be transferred and processed sequentially, thereby improving transmission speed while maintaining detection completeness.
3Productivity
If only changed image data is transmitted to reduce data amount, then transmission efficiency is improved, but synchronization between display and projection may be compromised
Solution Approach 1:
The patent implements a feedback mechanism where the projector sends back information about its current display state and received data to the computer. This feedback allows the computer to adjust subsequent change detection and transmission operations to maintain synchronization, ensuring that even when only changed blocks are transmitted, the projected image remains synchronized with the source display.
Data Source
AI summary
Change image detecting devices and methods are disclosed. In one example, a determination unit partially compares a first image and a reference image and determines whether there is a change therebetween. If the determination unit determines no change between the first image and the reference image, the change image detecting unit selects a second image, which is temporally later than the first image and stored in a first storing unit, as a new image to be processed and the determination unit partially compares the second image and the reference image at a different position than previously compared and determines whether there is a change between the second image and the reference image. If the determination unit determines change between the first image and the reference image, a change image detecting unit detects the first image stored in the first storing unit as the change image, and stores the first image in the second storing unit.