Abstract A chrominance to luminance gain and delay measurement display shows gain and delay inequalities due to differences between luminance and chrominance chanels of a video device as a point within a rectangular coordinate display system with respect to established tolerance limits. An appropriate test signal having bar and modulated pulse waveforms is selected from digitized video data stored in a field store acquisition memory. Luminance and chrominance arrays are derived from the modulated pulse waveform. The center points for each array are identified and displayed as a time difference between the center points along one axis of the display and as an amplitude ratio (chrominance/luminance) between the center points along an orthogonal axis of the display. The display includes a tolerance window so that an operator can readily observe whether the chrominance to luminance gain and delay is within established tolerances.
Inventors
👤 Tomoo Konishi
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-27 17:07
CPC Classifications
H; H04; H04N; H04N17/00; H04N17/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
127 words
A method for displaying chrominance to luminance gain and delay values comprising the steps of: selecting a desired portion of digitized video data containing a specified test signal from an acquisition memory containing a field of the digitized video data for processing; locating a specific waveform within the specified test signal; building a luminance array and a chrominance array from the digitized video data representing the specific waveform; computing from the luminance and chrominance arrays said chrominance to luminance gain and delay values; and displaying the computed chrominance to luminance gain and said delay values on a graphic display having rectangular coordinates, one coordinate representing a percentage ratio of said chrominance to luminance gain and the other coordinate representing a time for the chrominance to luminance delay.
Claim 2
Independent Claim
127 words
A method for displaying chrominance to luminance gain and delay values comprising the steps of: selecting a desired portion of digitized video data containing a specified test signal from an acquisition memory containing a field of the digitized video data for processing; locating a specific waveform within the specified test signal; building a luminance array and a chrominance array from the digitized video data representing the specific waveform; computing from the luminance and chrominance arrays said chrominance to luminance gain and delay values; and displaying the computed chrominance to luminance gain and said delay values on a graphic display having rectangular coordinates, one coordinate representing a percentage ratio of said chrominance to luminance gain and the other coordinate representing a time for the chrominance to luminance delay.
Claim 3
Dependent Claim
98 words
A method as recited in claim 1 wherein the displaying step comprises the steps of: graphically displaying a rectangular coordinate system on a display screen having time representing chrominance to luminance delay along one axis and percentage representing said chrominance to luminance gain along the other axis; graphically displaying within the rectangular coordinate system a tolerance box representing acceptable chrominance to luminance delay and gain values with respect to nominal values; and displaying the computed chrominance to luminance delay and gain values as a crosshair within the rectangular coordinate system and as numerical values on the display screen.