Display Inspection Using High-Resolution Image Sensor
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Solution Overview
Problem
Existing methods for testing display devices are limited in assessing display properties and cannot effectively evaluate the transmission path from a sending device to a receiving device, failing to detect dropped frames due to various errors in capturing, transmission, or display processing.
Innovation Solution
A method and apparatus that utilize an image sensor with higher resolution than the display to capture and analyze rendered images, correcting for orientation differences and resampling to match the display's resolution, allowing for comprehensive testing of display performance, including detection of distortions and quality assessment across the entire display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an image sensor with higher resolution than the display is used to capture the rendered image, then the measurement precision of display properties is improved, but the device complexity increases
Solution Approach 1:
The captured high-resolution image is divided into multiple regions of interest (ROIs) corresponding to different display areas. Each ROI is processed independently to extract display properties, which reduces the computational complexity compared to processing the entire high-resolution image while maintaining measurement precision.
Solution Approach 2:
The patent uses an image sensor to create a digital copy of the displayed image. This optical-to-digital copying allows for non-contact, non-invasive measurement of display properties. The digital copy can be analyzed without physically interacting with the display, simplifying the testing apparatus while improving measurement accuracy.
2Measurement precision
If the captured image is rotated to correct orientation differences, then the measurement accuracy is improved, but the processing time increases
Solution Approach 1:
The patent performs orientation correction by rotating the captured image to align with the display's coordinate system before extracting display properties. This preliminary alignment ensures that subsequent measurements are accurate without requiring repeated corrections during analysis, reducing total processing time.
Solution Approach 2:
The patent transforms the image orientation parameter to match the display's coordinate system. By changing the orientation parameter through rotation and then maintaining this corrected state for all subsequent measurements, the system achieves accurate alignment without repeatedly processing the image at different orientations.
3Reliability
If the captured image is resampled to match the display resolution, then the measurement reliability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent introduces resampling as an intermediary process between capturing the high-resolution image and analyzing display properties. The resampled image at display resolution serves as an intermediate representation that maintains the essential display information while eliminating the need for pixel-perfect alignment between the sensor and display resolutions, reducing manufacturing precision requirements.
Data Source
AI summary
There are disclosed various methods, apparatuses and computer program products for testing a display. In some embodiments an image sensor captures a rendered image from the display to form a captured image, the image sensor having a second resolution greater than the first resolution. The captured image is analyzed to find difference of orientation of the rendered image with respect to an orientation of the image sensor. A rotated image is formed on the basis of the analyzed difference of orientation to obtain orientation for the rotated image to correspond with the orientation of the image sensor. The rotated image is resampled to form a resampled image having the first resolution.