Digital Hologram Sequence Coding via Wavelet Residuals
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Solution Overview
Problem
Current digital holography methods are inefficient in encoding and reconstructing holograms, particularly when representing scenes with moving objects, as they fail to effectively utilize wavelet coefficients to predict and refine holograms, leading to suboptimal encoding efficiency.
Innovation Solution
A method that determines residuals by analyzing the difference between wavelet coefficients of two digital holograms in a multidimensional space, allowing for efficient encoding by redistributing coefficients and constructing a predicted hologram, which can be subtracted from the second hologram to reduce encoding complexity, and further refines the prediction using additional transforms based on object movement analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If digital holograms are represented by wavelet coefficients, then hologram reconstruction is simplified, but encoding efficiency deteriorates when scenes contain moving objects
Solution Approach 1:
The patent applies preliminary action by predicting the second hologram from the first hologram using wavelet coefficient transformation before encoding. The system pre-computes the predicted hologram coefficients based on the relationship between consecutive frames, allowing the actual encoding to only capture the residual differences rather than encoding the entire hologram from scratch, thus improving encoding efficiency while maintaining reconstruction simplicity
Solution Approach 2:
The patent extracts the redundant information by removing the predicted portion from the second hologram. By separating the predicted hologram coefficients from the actual second hologram coefficients, the system only needs to encode the residual differences (actual - predicted), effectively extracting and discarding the redundant predictive component to reduce encoding complexity and improve efficiency
2Device complexity
If wavelet coefficients are directly encoded, then encoding process is simple, but prediction accuracy deteriorates for moving objects
Solution Approach 1:
The patent introduces dynamics by adapting the wavelet coefficient transformation based on the specific characteristics of each hologram frame and its relationship with the previous frame. The system dynamically adjusts the prediction model by analyzing the actual content and movement patterns in the hologram sequence, allowing the transformation to optimize prediction accuracy for each specific case rather than using a fixed static transformation
Solution Approach 2:
The patent implements feedback by using the actual second hologram to verify and refine the prediction. The system computes the residual between the actual second hologram and the predicted hologram, and this residual information feeds back into the encoding process. This feedback mechanism allows the system to continuously improve prediction accuracy by learning from the actual content while maintaining a relatively simple encoding process
Data Source
AI summary
Disclosed is a method and a device for coding a sequence including first and second digital holograms representing respective scenes, the digital holograms being represented by a set of wavelets each defined by a multiplet of coordinates in multidimensional space. The first and second holograms are represented by first and second coefficients respectively associated with wavelets. The coding method includes the following steps: for each second coefficient, determining a remainder by a difference between the second coefficient concerned, associated with a first wavelet defined by a given multiplet, and the first coefficient) associated with a second wavelet defined by a multiplet having as its image the multiplet by a transform in the multidimenisonal space; coding the determined remainders. The transform is determined by analysis of variation between the first scene represented by the first digital hologram and the second scene represented by the second digital hologram.