Image Signal Conversion for Analog Display Compatibility
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Solution Overview
Problem
Analog cameras supporting NTSC or PAL standards have low resolving power due to limitations in television broadcast standards and CCD sensors, making it difficult to install additional transmission and display devices for high-resolution image processing and reproduction, especially when existing devices are already installed for analog broadcast standards.
Innovation Solution
A method and apparatus to convert digital image signals from CMOS image sensors into analog signals compliant with NTSC or PAL standards, using a controller to generate sample frequencies and adjust horizontal scan lines, allowing transmission and display on existing analog devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a CMOS sensor with high resolving power is used, then image quality is improved, but compatibility with existing analog transmission and display devices deteriorates
Solution Approach 1:
The patent introduces a signal conversion device as an intermediary between the CMOS sensor and existing analog transmission/display devices. This converter receives digital image signals from the CMOS sensor and transforms them into analog signals compliant with NTSC or PAL standards, enabling compatibility with existing infrastructure while preserving high image quality from the CMOS sensor.
Solution Approach 2:
The patent changes the signal format parameters by converting digital image signals into analog signals that match the temporal and spectral characteristics of NTSC/PAL standards. This involves adjusting sampling frequencies, scan rates, and signal modulation parameters to align with existing broadcast standards, thereby enabling compatibility without sacrificing CMOS sensor capabilities.
2Measurement precision
If additional transmission devices for high-resolution image processing are installed, then image transmission quality is improved, but system complexity and installation difficulty increase
Solution Approach 1:
The patent makes the signal conversion device universal by designing it to work with existing analog transmission infrastructure. The converter can interface with standard analog video cables, connectors, and display devices, eliminating the need for separate digital transmission systems. This multi-functional approach allows high-resolution images to be transmitted through existing channels without adding complex new infrastructure.
3Measurement precision
If display devices complying with digital television broadcast standard are replaced, then image reproduction quality is improved, but cost and time consumption increase
Solution Approach 1:
The patent creates a virtual copy of digital image quality on analog display devices by converting the signal format. Instead of replacing physical display hardware, the conversion device generates analog signals that replicate the visual quality of digital images on existing analog screens. This approach preserves the original display devices while achieving improved image reproduction quality through intelligent signal transformation.
Data Source
AI summary
Provided are an apparatus and method of converting a digital image signal, which is obtained through an image sensor comprising a plurality of pixels that are arranged in a matrix, into an analog image signal in order to transmit the analog image signal to a monitor device that outputs an image complying with a national television system committee (NTSC) standard or a phase-alternating line (PAL) standard. The method includes: generating a sample frequency based on the number of horizontal pixels of the digital image signal to comply with a horizontal scan period of the NTSC standard or the PAL standard; and converting image data of the horizontal pixels of the digital image signal into the analog image signal, according to the sample frequency.