JPS54116120A - Quantizing method of video signal and its unit - Google Patents

Quantizing method of video signal and its unit

Info

Publication number
JPS54116120A
JPS54116120A JP2374178A JP2374178A JPS54116120A JP S54116120 A JPS54116120 A JP S54116120A JP 2374178 A JP2374178 A JP 2374178A JP 2374178 A JP2374178 A JP 2374178A JP S54116120 A JPS54116120 A JP S54116120A
Authority
JP
Japan
Prior art keywords
level
video signal
quantization
density
converter
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.)
Pending
Application number
JP2374178A
Other languages
Japanese (ja)
Inventor
Takamichi Toyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP2374178A priority Critical patent/JPS54116120A/en
Publication of JPS54116120A publication Critical patent/JPS54116120A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To enable to prevent the production of biased profile effect, by performing fine quantization only for the intermediate level of video signal and coarse quantization for low level portions.
CONSTITUTION: The input video signal 1 is level-shifted 2 so that the black (high density)parts correspond to zero level, white (low density) to full scale level, and gray (intermediate density) to zero level. The input and output characteristics of the circuit from the A/D converter 4 to the D/A converter 8 include compression and expansion logic circuits 5, 7, and show the characteristics 50 with fine at around zero level and coarse around full scale level for positive and negative sides, since the converters 4, 8 perform quantization. When video is reproduced with such video signals quantized, since smoother tonal change can be obtained to the intermediate density where human eyes sense mostly the change, the occurrence of biased profile effect can be prevented.
COPYRIGHT: (C)1979,JPO&Japio
JP2374178A 1978-03-02 1978-03-02 Quantizing method of video signal and its unit Pending JPS54116120A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2374178A JPS54116120A (en) 1978-03-02 1978-03-02 Quantizing method of video signal and its unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2374178A JPS54116120A (en) 1978-03-02 1978-03-02 Quantizing method of video signal and its unit

Publications (1)

Publication Number Publication Date
JPS54116120A true JPS54116120A (en) 1979-09-10

Family

ID=12118724

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2374178A Pending JPS54116120A (en) 1978-03-02 1978-03-02 Quantizing method of video signal and its unit

Country Status (1)

Country Link
JP (1) JPS54116120A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5725776A (en) * 1980-07-23 1982-02-10 Ricoh Co Ltd Processing system of picture signal
JPS6074772A (en) * 1983-09-29 1985-04-27 Matsushita Electric Ind Co Ltd Quantizing method of multi-value picture information

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5725776A (en) * 1980-07-23 1982-02-10 Ricoh Co Ltd Processing system of picture signal
JPS6074772A (en) * 1983-09-29 1985-04-27 Matsushita Electric Ind Co Ltd Quantizing method of multi-value picture information
JPH0126591B2 (en) * 1983-09-29 1989-05-24 Matsushita Electric Ind Co Ltd

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