Z-Stack Microscopy Image Compression via Depth Map Segmentation
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Solution Overview
Problem
Digital microscopy Z-stacks require high bandwidth for storage and transmission due to large file sizes, with existing compression methods causing delays in viewing, especially over bandwidth-constrained channels.
Innovation Solution
The method involves generating an all-focus image and depth map, simulating the depth of field to create a low-bandwidth approximation of the Z-stack, and compressing the prediction residual along with the all-focus image and depth map to produce a final compressed result, allowing for progressive transmission and reduced file sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If individual image compression is used, then implementation simplicity is improved, but data file size increases
Solution Approach 1:
The patent segments the Z-stack data into two components: a low-resolution all-focus image representing the entire stack, and high-resolution individual slices. This segmentation allows the majority of data to be compressed efficiently while preserving detailed information only where needed, resolving the contradiction between simple compression and file size.
Solution Approach 2:
The patent extracts the essential structural information of the Z-stack into a separate all-focus image, leaving only the residual differences to be stored in high resolution. This extraction principle reduces the overall data volume while maintaining the ability to reconstruct full-resolution images when needed.
2Quantity of substance
If video compression techniques are used, then bandwidth requirements are reduced, but viewing delays increase
Solution Approach 1:
The patent performs preliminary compression by creating a low-resolution all-focus image that can be viewed immediately, while the full-resolution data is compressed and prepared in advance. This preliminary action allows users to start viewing without delay while full-quality data is being prepared, resolving the bandwidth-delay contradiction.
Solution Approach 2:
The patent applies partial compression by providing a complete low-resolution view immediately and offering high-resolution details on demand. This partial action approach satisfies immediate viewing needs with reduced bandwidth while allowing full quality when users are willing to wait or when bandwidth is available.
3Measurement precision
If high resolution Z-stack data is transmitted, then image quality is improved, but bandwidth requirements increase
Solution Approach 1:
The patent applies local quality by transmitting high resolution data only for specific regions or slices that require detailed examination, while the rest of the Z-stack is transmitted at lower resolution. This allows the system to maintain high image quality where needed while reducing overall bandwidth requirements.
Solution Approach 2:
The patent adds a quality dimension to the transmission strategy by providing multiple resolution levels (low-resolution all-focus image and high-resolution slices). Users can select the appropriate quality level based on their needs and available bandwidth, resolving the contradiction between image quality and bandwidth requirements.
Data Source
AI summary
A method and apparatus for compressing Z-stack microscopy images comprising compressing an all-focus image and depth map representation of an original Z-stack of images, computing a prediction residual as a difference between a simulated Z-stack, generated from the all-focus image and the depth-map, and the original Z-stack and concatenating the prediction residual to the compressed all-focus image and the depth map to produce a final compressed file.