FI942296A - Procedure for improving the quality of video printing - Google Patents

Procedure for improving the quality of video printing Download PDF

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Publication number
FI942296A
FI942296A FI942296A FI942296A FI942296A FI 942296 A FI942296 A FI 942296A FI 942296 A FI942296 A FI 942296A FI 942296 A FI942296 A FI 942296A FI 942296 A FI942296 A FI 942296A
Authority
FI
Finland
Prior art keywords
chrominance
quality
equalising
improvement
frequency
Prior art date
Application number
FI942296A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI98109B (en
FI942296A0 (en
FI98109C (en
Inventor
Caj Soedergaord
Original Assignee
Tummavuoren Kirjapaino Oy
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 Tummavuoren Kirjapaino Oy filed Critical Tummavuoren Kirjapaino Oy
Priority to FI942296A priority Critical patent/FI98109C/en
Publication of FI942296A0 publication Critical patent/FI942296A0/en
Publication of FI942296A publication Critical patent/FI942296A/en
Publication of FI98109B publication Critical patent/FI98109B/en
Application granted granted Critical
Publication of FI98109C publication Critical patent/FI98109C/en

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Abstract

Method for improvement of the quality of video compression, in which a PAL video signal consists of a luminance signal Y and a chrominance signal C, where the amplitude of C is Usinωt+Vcosωt. The method involves the phases: - calculation of the mean value from four consecutive images of a PAL series, cycle, in relation to Y, U and V, - equalising of the horizontal chrominance by using a low- pass filter to reduce the noise of the chrominance line, at a frequency which is higher than the upper limit of the bandwidth f subscript o, - equalising of the vertical chrominance with a low-pass filter, by selecting as the cut-off frequency fp of the pass band the first zero position of C in order to reduce the side lobes, - improvement of the horizontal chrominance resolution by more precise use of the luminance information, - increasing of the saturation by conversion of RGB to HLS and back, and - compensation of the gamma-correction caused by the camera tape recorder. <IMAGE>
FI942296A 1994-05-17 1994-05-17 A method for improving the quality of video printing FI98109C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FI942296A FI98109C (en) 1994-05-17 1994-05-17 A method for improving the quality of video printing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI942296A FI98109C (en) 1994-05-17 1994-05-17 A method for improving the quality of video printing
FI942296 1994-05-17

Publications (4)

Publication Number Publication Date
FI942296A0 FI942296A0 (en) 1994-05-17
FI942296A true FI942296A (en) 1995-11-18
FI98109B FI98109B (en) 1996-12-31
FI98109C FI98109C (en) 1997-04-10

Family

ID=8540715

Family Applications (1)

Application Number Title Priority Date Filing Date
FI942296A FI98109C (en) 1994-05-17 1994-05-17 A method for improving the quality of video printing

Country Status (1)

Country Link
FI (1) FI98109C (en)

Also Published As

Publication number Publication date
FI98109B (en) 1996-12-31
FI942296A0 (en) 1994-05-17
FI98109C (en) 1997-04-10

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FG Patent granted

Owner name: TUMMAVUOREN KIRJAPAINO OY

BB Publication of examined application
MM Patent lapsed