Color Identification for HDTV Broadcasting Video Monitor

Ri Jong Ju, a researcher at the Faculty of Communications, has invented a color identification method for HDTV broadcasting video monitors.

Nowadays, there has been a continuous increase in the demand for the quality of TV broadcasting and it includes color as well as video resolution. In order to represent the correct colour, dedicated video monitors supervise colors strictly when TV programs and TV sets are made. However, reference whites in each video monitor which are used as reference are a bit different so it is necessary to calibrate the colours of video monitors.

Colour identification is for adjusting the colour presentation characters of video monitors so that they show exactly the same colours for the same video.

Some equipment and software are used for colour calibration and every video monitor has its own calibration equipment.

The proposed method is useful for video monitors without their own calibration equipment. To display the same colours, the values of three primary colours should be in the same tolerance range. The method employs a colour analyzer and a spectrum analyzer.

First, both the colour analyzer and the spectrum analyzer measure the same video to set a reference value in the colour analyzer. Next, a measurement value and a target value of reference white in the colour calibration program are input before calculating adjustment values. At that time, various colour conversions and colour difference calculation algorithms are used in the program. Then, measurement mode is switched to analysis mode to adjust the colours of monitors to the value. When the target white colour reaches the same value, the monitors display the same colours.

The method was also applied to normal LCD TVs to use them as HDTV broadcasting video monitors. It produced the same effect.