JPH01136110A - Image detecting method - Google Patents

Image detecting method

Info

Publication number
JPH01136110A
JPH01136110A JP62293960A JP29396087A JPH01136110A JP H01136110 A JPH01136110 A JP H01136110A JP 62293960 A JP62293960 A JP 62293960A JP 29396087 A JP29396087 A JP 29396087A JP H01136110 A JPH01136110 A JP H01136110A
Authority
JP
Japan
Prior art keywords
histogram
value
decided
image
image exists
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP62293960A
Other languages
Japanese (ja)
Other versions
JPH0711619B2 (en
Inventor
Hisamitsu Hori
Original Assignee
Fuji Photo Film Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Priority to JP62293960A priority Critical patent/JPH0711619B2/en
Priority claimed from US07/274,544 external-priority patent/US4899194A/en
Publication of JPH01136110A publication Critical patent/JPH01136110A/en
Publication of JPH0711619B2 publication Critical patent/JPH0711619B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE: To decide whether an image exists or not in a short time and with high accuracy by comparing a frequency value of a histogram for showing the number of picture elements to an output signal of an image sensor, with a prescribed value, and also, comparing the number of times of a polarity inversion obtained by binarizing the output signal of the image sensor, with a prescribed value.
CONSTITUTION: When an expanse in the axis-of-abscissa direction of a histogram derived from an image signal of a narrow area, namely, the overall length L1 in the axis-of-abscissa direction in which the histogram exceeds a set value exceeds a set value, it is decided that an image exists, and by using this area. Also, when the overall length L becomes below the set value and it is decided that no image exists, this histogram derives binarization levels (a), (b) by using a histogram whose crest is high and whose width is narrow. Thereafter, while changing a focus zone, an output signal of a line sensor is binarized in a real time, and with respect to the focus zone in which the number of times of its polarity inversion exceeds a prescribed value, it is decided that an image exists. In such a way, whether the image exists or not can be decided in a short time and with high accuracy.
COPYRIGHT: (C)1989,JPO&Japio
JP62293960A 1987-11-24 1987-11-24 Image detection method Expired - Fee Related JPH0711619B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62293960A JPH0711619B2 (en) 1987-11-24 1987-11-24 Image detection method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP62293960A JPH0711619B2 (en) 1987-11-24 1987-11-24 Image detection method
US07/274,544 US4899194A (en) 1987-11-24 1988-11-22 Method of and device for detecting image

Publications (2)

Publication Number Publication Date
JPH01136110A true JPH01136110A (en) 1989-05-29
JPH0711619B2 JPH0711619B2 (en) 1995-02-08

Family

ID=17801416

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62293960A Expired - Fee Related JPH0711619B2 (en) 1987-11-24 1987-11-24 Image detection method

Country Status (1)

Country Link
JP (1) JPH0711619B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009291253A (en) * 2008-06-02 2009-12-17 Nidek Co Ltd Ophthalmic photographing apparatus
JP2009291252A (en) * 2008-06-02 2009-12-17 Nidek Co Ltd Occular fundus imaging apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009291253A (en) * 2008-06-02 2009-12-17 Nidek Co Ltd Ophthalmic photographing apparatus
JP2009291252A (en) * 2008-06-02 2009-12-17 Nidek Co Ltd Occular fundus imaging apparatus

Also Published As

Publication number Publication date
JPH0711619B2 (en) 1995-02-08

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Legal Events

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