Interlaced Image Processing Horizontal Line Flicker Reduction
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Solution Overview
Problem
Conventional interlaced image processing methods fail to effectively reduce horizontal line flicker in progressive scan displays due to non-alignment and varying widths of horizontal lines, particularly noticeable in still images.
Innovation Solution
An interlaced image processing method and apparatus that performs horizontal line detection, adjusts the position of horizontal lines to align with corresponding lines in previous fields, and re-samples the fields to minimize pixel value differences between top and bottom fields, thereby reducing flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If line doubling is employed to display interlaced top and bottom fields using progressive scan, then the display can show interlaced fields on progressive scan displays, but horizontal line flicker occurs due to non-alignment and varying widths of horizontal lines
Solution Approach 1:
The patent performs preliminary horizontal line detection and position adjustment on the interlaced fields before displaying them on the progressive scan display. By detecting horizontal lines in advance and adjusting their positions to align with the display's native scan lines, the flicker problem is prevented before it occurs during display, while maintaining compatibility with progressive scan technology
Solution Approach 2:
The patent changes the positional parameters of horizontal lines by adjusting their vertical positions to match the progressive scan display's line structure. This parameter adjustment aligns the interlaced field lines with the progressive display lines, eliminating the flicker effect while preserving the ability to display interlaced content on progressive displays
2Object-affected harmful factors
If conventional interpolation is used to generate an interpolated bottom field from the top field, then some flicker is reduced, but the pixel value difference between fields remains large and flicker is not effectively eliminated
Solution Approach 1:
The patent replaces the conventional interpolation method with a horizontal line detection and position adjustment mechanism. Instead of calculating new pixel values through interpolation, the system detects actual horizontal lines and adjusts their positions, providing more accurate flicker reduction while preserving the original image data and avoiding the pixel value accuracy problems associated with interpolation
3Productivity
If the top and bottom fields include different parts of the frame, then interlaced scanning can be implemented, but the non-alignment of horizontal lines causes varying widths and flicker
Solution Approach 1:
The patent employs feedback by detecting the actual positions of horizontal lines in the interlaced fields and using this information to adjust their positions for proper alignment. The detection results feed into the position adjustment process, creating a closed-loop system that ensures horizontal lines are correctly positioned despite the interlaced scanning structure, thereby maintaining line alignment stability while preserving scanning efficiency
Data Source
AI summary
In an interlaced image processing method for processing fields generated by interlacing and including a plurality of rows of scan signals, the method includes: performing horizontal line detection on a current field so as to determine which of the rows of the scan signals is a horizontal line; according to the horizontal line detection result of the current field and a horizontal line detection result of a previous field, adjusting position of the horizontal line in the current field so as to approach position of a corresponding horizontal line in the previous field; and according to the result of position adjustment, re-sampling the current field. An interlaced image processing apparatus for implementing the method is also disclosed.