Unlock instant, AI-driven research and patent intelligence for your innovation.

Exposure control device and exposure control method

A technology of exposure control and image sensor, applied in the direction of gain control, exposure control, amplification control, etc., which can solve problems such as flickering, frequent changes in shutter speed amplifier gain, etc.

Inactive Publication Date: 2005-04-27
SEIKO EPSON CORP
View PDF1 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Therefore, although it is necessary to perform exposure control so that the brightness of the photographed image converges to the exposure target value at high speed and with high precision, as described above, if the sensitivity of the exposure control system is increased, the flicker phenomenon will occur.
Especially in the case of detection of correlation between frames, etc., frequent changes in shutter speed or amplifier gain are undesirable

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
  • Exposure control device and exposure control method
  • Exposure control device and exposure control method
  • Exposure control device and exposure control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] Hereinafter, embodiments of the exposure control device of the present invention will be described with reference to the drawings.

[0034] First, its structure will be described.

[0035] FIG. 1 is a diagram showing a functional configuration of an exposure control device 1 according to an embodiment of the present invention.

[0036] In FIG. 1 , an exposure control device 1 includes: an analog-to-digital video signal main line (hereinafter referred to as “main line”) 10 , an exposure control unit 20 , and a microcontroller 30 .

[0037] The main line unit 10 further includes: an image sensor 11 , a programmable gain amplifier (PGA: Programmable Gain Amp) 12 , and an ADC (Analog to Digital Converter: Analog to Digital Converter) 13 .

[0038] The image sensor 11 has an electronic shutter, and receives light incident from the lens at a shutter speed set by the exposure control unit 20 . Furthermore, the image sensor 11 photoelectrically converts the received light (im...

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 exposure control apparatus is provided to perform an adjustment while changing the correction amount of a shutter speed of an image sensor and a gain of a PGA according to the magnitude of an exposure error so that the exposure error falls within an exposure allowable range. The exposure control apparatus changes the correction amount of the shutter speed and the gain at a specified different change rate according to control sensitivity inputted from a microcontroller. If a flicker phenomenon occurs after the exposure error is converged to within the exposure allowable range, the exposure control apparatus sets the control sensitivity to be low. Accordingly, it becomes possible to perform proper exposure control to detect objective information from the captured image.

Description

technical field [0001] The present invention relates to an exposure control device and an exposure control method for controlling an imaging device capable of detecting target information from a captured image. Background technique [0002] Conventionally, in an imaging device used to measure a specific object, such as a medical camera or a production line camera, target information such as chromaticity and brightness level (reflectance) is detected from a captured image of the object (subject). [0003] Specifically, the state of an object is recognized by acquiring color, brightness, etc. from a photographed image and digitizing them. [0004] In addition, in an imaging device, exposure control is generally performed so that the brightness of a photographed image falls within a constant range. [0005] Usually, when exposure control is performed, the brightness of a photographed image is measured and digitized to be an evaluation value of brightness. Then, this evaluatio...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H04N23/76G03B7/091H03G3/00H04N23/75
CPCH04N5/2352H04N5/2357H04N23/72H04N23/745
Inventor 仓根治久
Owner SEIKO EPSON CORP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com