Leader Electronics Corporation

Genichi Imamura

Masaaki Nagai

Takayuki Miyajiri

Koji Yano

A display method and apparatus are provided for enabling a user, whether or not he has experience, to readily detect a luminance level of a video image with high accuracy. A luminance level of a video signal of a video image is converted to color information to display a change in the luminance of the video image as a change in color. The conversion preferably involves a method of converting the luminance level to color information of three primary colors, red, green, blue, in accordance with a plurality of weights, respectively, a method of converting a luminance level in a predetermined range to color information having a changing rate larger than a changing rate of the luminance level, a method of converting a luminance level out of the predetermined range to color information of a maximum or a minimum level, or the like. Also, the input video signal is preferably displayed together with a converted video image side by side or one on another.

Luminance information display apparatus and method

A measuring instrument is fed with a video output signal, and performs RGB processing on the video output signal to generate graphic data. A video signal level in the graphic data is measured and video signal level data is generated. Display data including the graphic data and the video signal level data is generated. A display device receives display data from the measuring instrument. The display data is visualized and an image and a video signal level are displayed.

Measuring instrument for measuring video signal level and display device for displaying video signal level

The present invention reduces a burden on an observer. A video signal level display device includes setting sections () for setting maximum effective values corresponding to R, G, and B components, respectively, of an RGB component signal, calculating sections () for calculating respective coordinates of the R, G, and B components so that the maximum effective values concentrate at one point, generating section () for generating straight scale data corresponding to the R, G, and B components, respectively, so that the maximum effective values concentrate at one point, and display section () for displaying the respective coordinates of the R, G, and B components and the respective straight scale date () on the R, G, and B components.

Video signal level display device

A video signal level monitoring apparatus which monitors the level of a video signal, said apparatus comprises means for inputting a first color difference component (Cb) and a second color difference component (Cr) of a component video signal, means for inputting a luminance component (Y) of the component video signal as a luminance component (Y) of a composite video signal, means for generating a color component (C) of the composite video signal from the first color difference component and the second color difference component, and means for displaying each of the amplitude values of the color component (C) and the luminance component (Y) in a one-dimensional direction. Preferably, the display means displays each amplitude value in a bar graph display and scale marks corresponding to a minimum acceptable value and a maximum acceptable value within a range in accordance with a predetermined standard.

Video signal level monitoring apparatus

An evaluator for evaluating a digital transmission system is provided which comprises a signal power decrease detector and a system margin evaluator. The signal power decrease detector receives a digital signal which has been transmitted through the transmission medium of a transmission system so as to generate a signal power decrease signal. The system margin evaluator evaluates the system margin of the transmission system in response to the signal power decrease signal. The system margin of the digital transmission system can be evaluated in a simple and convenient manner.

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Yokohama, Japan

Genichi Imamura