Motion-Adaptive Deinterlacing System

Motion-Adaptive Deinterlacing System Combining Pixel Motion Sensitivity and Block SAD

This technology is a motion-adaptive deinterlacing system that performs both pixel-based detection, which calculates motion sensitivity using pixel values across multiple fields, and block-based detection, which captures slow motion using the Sum of Absolute Differences (SAD) between field blocks. It then selects spatial, temporal, or hybrid interpolation to fill in missing pixels based on the resulting weights.

Intra-field methods create flicker noise in high-frequency areas, while inter-field methods only perform well in static areas, leading to artifacts in moving scenes. Motion-adaptive techniques that switch between these two methods often fail to detect motion, frequently misidentifying small moving objects as static and selecting the wrong interpolation method.

This technology includes an exception handling unit that re-evaluates areas with low motion sensitivity using block SAD to prevent errors where slow motion is mistaken for static. It applies temporal interpolation to static areas, MELA-based spatial interpolation to motion areas, and a weighted blend of both to intermediate areas. Applicable to sports broadcast processors and surveillance recording devices, it suppresses ghosting and flickering even in scenes with a mix of fast action and subtle movement.

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Key Features:

• A pixel-based detection unit that calculates motion sensitivity using pixel values between input video fields to detect the motion type of an object
• A block-based detection unit that calculates the Sum of Absolute Differences between field blocks to detect low-motion moving objects
• A weight determination unit that calculates interpolation weights based on motion sensitivity and the Sum of Absolute Differences, selecting temporal, spatial, or combined interpolation based on threshold comparisons
• An exception handling unit that adjusts the weight to 1 if the Sum of Absolute Differences exceeds a third threshold when the weight is 0

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This invention was developed with support from the Ministry of Education's research program for core source technologies for next-generation smart media video services.

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