Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Image signal process device

A technology of image signal processing and image signal, which is applied in the direction of image communication, TV, color TV parts, etc., and can solve problems such as clamp instability and noise

Inactive Publication Date: 2004-03-24
SANYO ELECTRIC CO LTD
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the gain is increased, the clamp becomes unstable, and there is a problem that cross-cut saw-like noise tends to occur.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Image signal process device
  • Image signal process device
  • Image signal process device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] Next, embodiments of the present invention will be described with reference to the drawings.

[0022] FIG. 1 is a block diagram showing a schematic circuit configuration of an image signal processing device according to an embodiment of the present invention. This device is composed of an analog signal processing circuit 50 , an A / D (Analog-to-Digital) conversion circuit 52 , a digital signal processing circuit 54 , a gain setting circuit 56 , and a clamp time constant setting circuit 58 .

[0023] The analog signal processing circuit 50 includes an AGC circuit 70 , a clamp circuit 72 , and a D / A (Digital-to-Analog) conversion circuit 74 . The AGC circuit 70 inputs an image signal from the CCD image sensor, and amplifies that image signal in accordance with the gain given from the gain setting circuit 56 . The clamp circuit 72 is a circuit that clamps the DC level of the image signal amplified on the AGC circuit 70, and is synchronized with the horizontal synchronizati...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An AGC circuit (70) amplifies a video signal according to again value output from again setting circuit (56). A clamp circuit (72) performs clamping of the direct current level of an output signal from the AGC circuit (70) at a clamp ability level according to a time constant set by a clamp time constant setting circuit (58). The clamp time constant setting circuit (58) receives input of the gain value generated by the gain setting circuit (56). A comparator circuit (120) compares the received gain value to a reference value, and, when the gain value exceeds the reference value, outputs a relatively large time constant. The clamp ability level of the clamp circuit (72) is controlled according to this time constant. In this manner, when the gain value is large, gradual clamping can be executed so as to minimize the influence of noise components superimposed on the direct current level, thereby suppressing transverse noise.

Description

technical field [0001] The present invention relates to an image signal processing device for processing an image signal output from an imaging element, and particularly relates to control of the DC level of the image signal. Background technique [0002] An image signal obtained by an imaging element such as a CCD (Charge Coupled Device) image sensor is usually taken out by capacitive coupling. Therefore, the DC level of the image signal can be varied by the image signal level. Therefore, an image signal (OPB image signal) corresponding to an optical black area (OPB) provided in the peripheral portion of the pixel array of the imaging element is subjected to clamping processing for setting a predetermined black level. Furthermore, in the output of an AGC (Auto Gain Control) circuit provided in the subsequent stage, the DC level of the image signal can be varied according to the gain of the AGC circuit. Therefore, a clamping circuit for controlling the DC level is provided...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04N5/18
CPCH04N5/185H04N5/18
Inventor 高桥达也渡边透田畑修
Owner SANYO ELECTRIC CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com