SAR Image Aspect Ratio Adjustment for Object Recognition
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Solution Overview
Problem
Synthetic aperture radar (SAR) imagery is challenging to interpret due to geometric distortions like layover and shadow effects, requiring experienced analysts for object recognition and classification, and existing processing methods present images in slant-plane or ground-plane with square pixels, making object recognition difficult.
Innovation Solution
Processing SAR images to alter the aspect ratio and orientation based on image collection geometry, making shadows or layovers appear more similar to objects, which involves transforming the image through reflection or rotation, and using a signal processor to adjust the image presentation to enhance object recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If SAR images are presented in slant-plane or ground-plane with square pixels, then the image data can be easily processed and displayed, but object recognition becomes difficult due to geometric distortions like layover and shadow
Solution Approach 1:
The patent transforms the 2D SAR image by altering its aspect ratio to create a distorted view that compensates for layover and shadow effects. This dimensional transformation changes how geometric features are represented, making objects more recognizable despite the non-standard pixel geometry.
Solution Approach 2:
The patent changes the aspect ratio parameter of the image from the standard square pixel configuration to a distorted configuration. This parameter change is specifically designed to counteract the geometric distortions inherent in SAR imaging, thereby improving object recognition while maintaining processing capability.
2Difficulty of detecting and measuring
If the aspect ratio of SAR images is altered to make shadows and layovers appear more similar to objects, then object recognition is simplified, but the image geometry becomes non-standard and more complex to process
Solution Approach 1:
The patent applies the aspect ratio transformation as a preliminary processing step before object recognition. By pre-distorting the image to compensate for geometric effects, the subsequent object recognition process becomes simpler, even though the initial processing step is more complex.
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
Simplifies the recognition of objects in SAR imagery by improving the visibility of shadows and layovers, allowing for more efficient object classification and recognition, even for less experienced analysts, by altering the image aspect ratio and orientation to align distortions with the object's appearance.
Implementation Method 1
a radar signal emitter configured to emit pulses of radio frequency electromagnetic radiation, for illumination of an area of interest
Implementation Method 2
the radar signal receiver being configured to detect electromagnetic radiation reflected from the illuminated area of interest
Data Source
AI summary
Embodiments described herein simplify the recognition of objects in synthetic aperture radar (SAR) imagery. This may be achieved by processing the image in order to make the shadow caused by the object appear more similar to the object. Alternatively, this may be achieved by processing the image in order to make the layover caused by the object appear more similar to the object. Manipulation of the shadow caused by the object and the layover caused by the object may comprise altering the aspect ratio of the image, and in the case of manipulating the shadow caused by the image, may further comprise transforming the image by reflection or rotation. The aspect ratio of the image may be altered based on information about the image collection geometry, obtained by the SAR.