Projector Image Deformation with Background Data Generation
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Solution Overview
Problem
Geometric corrections in image processing devices, such as keystone distortion correction, often lead to image contraction, resulting in degraded display image quality due to unsuppressed peripheral regions without image display.
Innovation Solution
An image processing device that includes an image deformation section for performing geometric corrections and an output image generation section to determine and output background data when input image data is not available, ensuring accurate timing and reducing unnecessary data writing to the frame memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If geometric correction is performed to correct keystone distortion, then the shape accuracy of the display image is improved, but the display image quality degrades due to image contraction and empty peripheral regions
Solution Approach 1:
The patent applies preliminary action by generating background image data in advance for peripheral regions before the geometric correction process completes. The background data generation section pre-prepares replacement data that will be used to fill empty regions caused by contraction deformation, ensuring that no blank or degraded areas appear in the final corrected image.
Solution Approach 2:
The patent applies local quality by treating different regions of the image differently. The generation control section identifies specific peripheral regions affected by contraction deformation and applies background image data only to those localized areas, while preserving the quality of the main corrected image content. This targeted approach maintains overall image quality while fixing local degradation issues.
2Shape
If the image is contracted to correct keystone distortion, then the shape distortion is corrected, but the image size decreases and peripheral regions become empty
Solution Approach 1:
The system pre-generates background image data for regions that will become empty after contraction. By preparing this replacement data in advance, the system ensures that when the image is contracted and peripheral regions become empty, these areas are immediately filled with appropriate background data rather than remaining blank or showing artifacts.
3Reliability
If background data is continuously written to frame memory, then the display image quality is maintained, but unnecessary data writing increases processing overhead
Solution Approach 1:
The generation control section selectively generates background image data only for specific peripheral regions identified as affected by contraction deformation. Instead of continuously writing background data to the entire frame memory, the system targets only the necessary localized areas, reducing unnecessary data writing operations while maintaining display image quality in the affected regions.
4Measurement precision
If the image processing device performs deformation correction, then the geometric accuracy is improved, but the display image quality degrades in peripheral regions
Solution Approach 1:
The system applies different processing to different regions: the main image content undergoes geometric correction to improve accuracy, while peripheral regions identified as affected by contraction receive background image data to maintain quality. This localized differential processing preserves geometric accuracy where needed while preventing quality degradation in vulnerable peripheral areas.
Data Source
AI summary
A projector adapted to deform an input image to generate an output image includes a geometric correction section adapted to perform a geometric correction of the input image, and a background data generation section adapted to output data of a post-correction image as data of the output image in the case in which the data of the post-correction image obtained by performing the geometric correction on the input image is input from the geometric correction section, and to output data of a background image to be a background of the post-correction image as the data of the output image in the case in which the data of the post-correction image is not input from the geometric correction section.