Endoscope Video Processor Discrimination Signal Switching
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Solution Overview
Problem
Endoscope systems face delays in switching between SDTV and HDTV signals during storage, leading to potential losses in video quality and difficulties in identifying the source of malfunctioning digital video signals.
Innovation Solution
An image processing apparatus that generates and processes serial digital video signals with a discrimination signal for instant switching between SDTV and HDTV, includes additional information for signal identification, and adjusts dynamic ranges for optimal video output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If switching between SDTV and HDTV signals is performed by analyzing and discriminating the video signals in the storing device side, then the storing device can automatically identify the signal type, but the switching process takes time due to the analysis and discrimination algorithm execution
Solution Approach 1:
The video processor generates a discrimination signal in advance that indicates whether the serial digital video signal is an SDTV signal or an HDTV signal. This discrimination signal is output to the storing device simultaneously with the video signal, allowing the storing device to immediately identify the signal type without executing analysis algorithms, thereby eliminating switching delay.
Solution Approach 2:
A discrimination signal acts as an intermediary between the video processor and the storing device. This separate control signal carries the signal type information (SDTV or HDTV) independently from the video data stream, enabling the storing device to switch storage modes instantly based on the discrimination signal without analyzing the video content itself.
2Manufacturing precision
If lasers at different wavelengths are used when storing the SDTV signal and the HDTV signal, then the storing device can optimize storage for each signal type, but switching delay arises also in laser switching with following the switching of the SDTV signal and the HDTV signal
Solution Approach 1:
The discrimination signal is generated and transmitted to the storing device in advance along with the video signal, so the storing device is already prepared with the correct laser wavelength ready when the signal type changes. This eliminates the need for reactive laser switching and prevents video loss during transitions.
3Loss of information
If additional information is inserted in a video blanking period, then signal identification is enabled, but the blanking period must be utilized which limits available transmission time
Solution Approach 1:
Instead of embedding identification information within the video signal's blanking period, a separate discrimination signal is used as an intermediary carrier. This dedicated control signal line transmits signal type information independently, avoiding competition with the video data transmission and eliminating the need to utilize the limited blanking period for identification purposes.
Data Source
AI summary
This is an endoscope apparatus which has an endoscope which picks up an image of a sample using a solid state image pickup element and outputs an image pickup signal, and a processor which processes the above-mentioned image pickup signal, generates HDTV and SDTV serial digital video signals, switches one side of those selectively, and performs a serial output, in which the serial digital video signal switched selectively by the above-mentioned processor is output through a first connector, the above-mentioned processor is equipped with a discrimination signal generating section which is linked with selection switching of the above-mentioned HDTV or SDTV serial digital video signal to generate an HDTV/SDTV discrimination signal which can discriminate the above-mentioned HDTV or SDTV serial digital video signal, and the discrimination signal is output through a second connector different from the above-mentioned first connector.