Radiographic Image Compression via Adjacent Element Difference
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Solution Overview
Problem
Conventional radiographic-image capturing devices experience varying compression ratios for image data, depending on image capturing locations and irradiation conditions, leading to inefficient data transfer and increased power consumption due to suboptimal compression methods.
Innovation Solution
The device employs a scanning line and signal line intersection layout with a read-out circuit and compression means that calculates differences between adjacent radiation detection elements' data, performing compression in the signal line direction to enhance compression ratios and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image data is transferred without compression, then image quality is preserved, but transfer time becomes longer and power consumption increases
Solution Approach 1:
The patent applies reversible compression algorithms that transform image data into a more compact representation while preserving all original information. By changing the parameter of data representation (from uncompressed to compressed format), the system achieves shorter transfer times without sacrificing image quality, as the compression is lossless and can be perfectly reconstructed at the receiving end.
2Reliability
If reversible compression is used to maintain image quality, then compression ratio is limited, but if irreversible compression is used, compression ratio increases but image quality deteriorates
Solution Approach 1:
The patent employs reversible compression techniques that change the data representation parameters to achieve compression while maintaining perfect reconstructability. This approach prioritizes information preservation over maximum compression ratio, ensuring that medical diagnostic quality is maintained while still achieving meaningful compression for efficient transfer.
3Loss of time
If image data is transferred with higher compression ratio, then transfer time is reduced, but power consumption during transfer increases
Solution Approach 1:
The patent uses reversible compression to optimize the balance between transfer time and power consumption. By transforming data into a compact reversible format, the system reduces the volume of data to be transmitted, thereby shortening transfer time and subsequently reducing the power consumption associated with the transfer operation, even though the compression process itself requires computational energy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach increases the compression ratio of image data, maintains high compression efficiency regardless of irradiated radiation levels, and reduces data transfer time and power consumption, particularly in battery-powered devices.
Implementation Method 1
a so-called indirect-type radiographic-image capturing device which converts irradiated radiation into electromagnetic waves having other wavelength such as a visible light with a scintillator or the like, after which, according to the amount of energy of the converted and irradiated electromagnetic waves, generates charges at a photoelectric conversion element such as a photodiode, and converts them into electric signals
Data Source
AI summary
The radiographic-image capturing device is provided with: a detecting unit that has multiple scanning lines and multiple signal lines arranged so as to intersect with each other, and has multiple radiation detection elements arranged two-dimensionally at each of the areas partitioned by the multiple scanning lines and multiple signal lines; a reading circuit that reads electric charges from the radiation detection elements via the signal lines, and converts the electric charges to electric signals, and outputs the electric signals as image data, for each of the radiation detection elements; and compressing means for compressing image data of each of the radiation detection elements. The compressing means creates difference data between the image data of adjacent radiation detection elements, for each of the image data outputted from multiple radiation detection elements connected to the same signal line, and compresses this difference data.