Field Balancing Device for Interlaced Signal Color Consistency

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Solution Overview

Problem

Direct de-interlacing processing of interlaced signals with color differences between top and bottom fields leads to sudden blinking and color variations, especially in regions with motion and still images.

Innovation Solution

A field balancing device and method that detect lightness/color differences between top and bottom fields using a detection circuit and selectively process the interlaced signal with a low pass filter to balance the lightness/color, employing average value generators, determining units, and frame buffers to generate detection results and adjust filtering accordingly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If de-interlacing processing is performed directly on interlaced signal with color differences between top and bottom fields, then processing speed is maintained, but sudden blinking and color variations occur around motion regions and still image regions

Engineering Contradiction:

Improveprocessing speedVSAvoidsudden blinking and color variations

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by detecting lightness/color differences between top and bottom fields before performing de-interlacing processing. The detection circuit analyzes the interlaced signal in advance to identify regions with significant color differences, and the processing circuit then selectively applies de-interlacing only to those identified regions, preventing sudden blinking and color variations while maintaining processing efficiency.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If de-interlacing processing is performed on interlaced signal with color differences, then motion regions can be processed, but color variations occur around still image regions due to merging of top and bottom fields

Engineering Contradiction:

Improvemotion region processing capabilityVSAvoidcolor consistency in still image regions

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by making the de-interlacing processing selective based on detected characteristics. The detection circuit identifies specific regions (motion regions vs. still image regions) and the processing circuit applies different handling strategies: de-interlacing is applied to motion regions while still image regions are processed differently to maintain color consistency, thus achieving both motion processing capability and color consistency.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements feedback through the detection circuit that continuously monitors lightness/color differences between top and bottom fields. Based on this feedback, the processing circuit dynamically adjusts its de-interlacing strategy, applying processing only where needed and maintaining original fields where color consistency is critical, thereby preventing color variations in still image regions.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS8059197B2Field balancing device and method

Publication Date: 2011.11.15 REALTEK SEMICON CORP

AI summary

A field balancing device for balancing the lightness/color of top fields and bottom fields of an interlaced signal includes: a detection circuit for detecting a lightness/color difference between at least one portion of at least one top field of the interlaced signal and at least one portion of at least one bottom field of the interlaced signal to generate a detection result; and a processing circuit, coupled to the detection circuit, for selectively processing at least one field of the interlaced signal according to the detection result to balance the lightness/color of top fields and bottom fields of the interlaced signal.