EP0167387A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Video signal processing apparatus
Assignee: Panasonic Holdings Corp
•
Filing: 1985-07-01
•
Granted: —
•
Expires: 2005-07-01
Abstract
Abstract A video signal processing apparatus comprises a digital filter (118) for passing a specific frequency band of a digitized input luminance signal; non-linear processing means (122) for non-linearly processing the signal passed through said digital filter (118); and arithmetic means (123) for mixing said digitized input luminance signal directly or after delayed by a specific time with an output signal of said non-linear processing means, wherein the passing band component of said digital filter (118) is suppressed or emphasized depending on the input signal amplitude of said non-linear processing means. An embodiment for two-dimensional processing is also disclosed using a plurality of filters and a plurality of non-linear processing means with a single arithmetic means for mixing the outputs of the non-linear processing means.
Inventors
- 👤 Haruo Ohta
- 👤 Masao Tomita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 07:46
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/20; H04N5/21; H04M; H04M5/00; H04M5/18; H04M5/20
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
90 words
A video signal processing apparatus comprising: a digital filter (118) for passing a specific frequency band of a digitized input luminance signal; nonlinear processing means (122) for nonlinearly processing the signal passed through said digital filter (118); and arithmetic means (123) for mixing said digitized input luminance signal directly or after delayed by a specific time with an output signal of said nonlinear processing means. wherein the passing band component of said digital filter (118) is suppressed or emphasized depending on the input signal amplitude of said nonlinear processing means.
Claim 2
Dependent Claim
90 words
A video signal processing apparatus comprising: a digital filter (118) for passing a specific frequency band of a digitized input luminance signal; nonlinear processing means (122) for nonlinearly processing the signal passed through said digital filter (118); and arithmetic means (123) for mixing said digitized input luminance signal directly or after delayed by a specific time with an output signal of said nonlinear processing means. wherein the passing band component of said digital filter (118) is suppressed or emphasized depending on the input signal amplitude of said nonlinear processing means.
Claim 3
Dependent Claim
20 words
The video signal processing apparatus as set forth in claim 1. wherein said digital filter (118) is a high-pass filter.
Claim 4
Dependent Claim
20 words
The video signal processing apparatus as set forth in claim 1, wherein said digital filter (118) is a band-pass filter.
Claim 5
Dependent Claim
57 words
The video signal processing apparatus as set forth in claim 1, wherein said digital filter (118) comprises a memory (119 for delaying the digitized input luminance signal by one horizontal scanning period, and an arithmetic operation means (120) to pick up a difference between said digitized input luminance signal and an output signal of said memory (119).
Claim 6
Dependent Claim
42 words
The video signal processing apparatus as set forth in claim 1, wherein said nonlinear processing means (122) has an input-output characteristic to suppress the passing band component of said digital filter (118) when the input signal amplitude is below a specified level.
Claim 7
Dependent Claim
40 words
The video signal processing apparatus as set forth in claim 1, wherein said nonlinear processingmeans (122) has an input-output characteristic to emphasize the passing band component of said digital filter when the input signal amplitude is above a specified level.
Claim 8
Dependent Claim
61 words
The video signal processing apparatus as set forth in claim 1, wherein said nonlinear processing means has an input-output characteristic to suppress the passing band component of said digital filter when the input signal amplitude is below a specified level and to emphasize the passing band component of said digital filter when the input signal amplitude is above said specified level.
Claim 9
Dependent Claim
38 words
The video signal processing apparatus as set forth in claim 1, wherein said nonlinear processing means comprises a read-only memory, using the input signal as an address, and a memory content written in the address as output signal.
Claim 10
Dependent Claim
39 words
The video signal processing apparatus as set forth in claim 1, wherein said nonlinear processing means comprises a plurality of input/output circuits (130a-130n3 having different input-output characteristics, and a selection means (131,132) to select one of said input/output circuits.
Claim 11
Dependent Claim
36 words
The video signal processing apparatus as set forth in claim 4, wherein it is designed to compensate for a dropout by utilizing a signal being delayed by one horizontal scanning period obtained from said digital filter.
Claim 12
Dependent Claim
95 words
A video signal processing apparatus (Fig. 14) comprising: a plurality of digital filters for dividing horizontal and vertical two-dimensional frequency region of a digitized input luminance signal into plural two-dimensional frequency bands; a plurality of nonlinear processing means (344.345. for non- linearly processing outputs of said plurality of digital filters, respectively; and arithmetic operation means (347) for mixing outputs of said plurality of nonlinear processing means, wherein the passing band components of said plurality of digital filters are suppressed or emphasized depending on the input signal amplitudes of said plurality of nonlinear processing means, respectively.
Claim 13
Dependent Claim
95 words
A video signal processing apparatus (Fig. 14) comprising: a plurality of digital filters for dividing horizontal and vertical two-dimensional frequency region of a digitized input luminance signal into plural two-dimensional frequency bands; a plurality of nonlinear processing means (344.345. for non- linearly processing outputs of said plurality of digital filters, respectively; and arithmetic operation means (347) for mixing outputs of said plurality of nonlinear processing means, wherein the passing band components of said plurality of digital filters are suppressed or emphasized depending on the input signal amplitudes of said plurality of nonlinear processing means, respectively.
Claim 14
Dependent Claim
51 words
The video signal processing apparatus as set forth in claim 11, wherein said each of said plurality of non- linear processing means has an input-output characteristic to suppress the passing band component of corresponding one of said plurality of digital filters when the input signal amplitude is below a specified level.
Claim 15
Dependent Claim
50 words
The video signal processing apparatus as set forth in claim 11, wherein each of said plurality of nonlinear processing means has an input-output characteristic to emphasize the passing band component of corresponding one of said plurality of digital filters when the corresponding input signal amplitude is above a specified level.
Claim 16
Dependent Claim
71 words
The video signal processing apparatus as set forth in claim 11, wherein each of said plurality of nonlinear processing means has an input-output characteristic to suppress the passing band components of corresponding one of said plurality of digital filters when the corresponding input signal amplitude is below a specified level and to emphasize the passing band component of the same when the corresponding input signal amplitude is above the specified level.
Claim 17
Dependent Claim
41 words
The video signal processing apparatus as set forth in claim 11, wherein each of said plurality of nonlinear processing means comprises a read-only memory, using the inp signal as address, and a memory content written in the address as output signal.
Claim 18
Dependent Claim
41 words
The video signal processing apparatus as set forth in claim 11, wherein each of said plurality of nonlinear processing means comprises a plurality of input/output circuits having different input-output characteristics, and a selecting means to select one of said input/output circuits.
Claim 19
Dependent Claim
32 words
The video signal processing apparatus as set forth in cleim 11, wherein dropout is compensated by utilizing a sicnel delayed by one horizontal scanning period obtained at d plurality of digital filters.
Claim 20
Dependent Claim
32 words
The video signal processing apparatus as set forth in cleim 11, wherein dropout is compensated by utilizing a sicnel delayed by one horizontal scanning period obtained at d plurality of digital filters.
Claim 21
Dependent Claim
105 words
18 . A video signal processing apparatus according to any one of claims 11 to 17, wherein there are four digital filters for dividing horizontal and vertical two-dimensional frequency region of a digitized input luminance signal into plural two-dimensional frequency bands , said first through fourth digital filters having respectively the following transfer functions: where w -1 is a delay of one horizontal scanning period, z -1 is a delay of specified period D, and z -2 is a delay of specified period 2D; and wherein there are three nonlinear processing means for nonlinearly processing output signals of said second through fourth digital filters, respectively
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.