Television – Format conversion – Line doublers type
Patent
1998-01-30
2000-05-02
Kostak, Victor R.
Television
Format conversion
Line doublers type
348458, 3647505, H04N 701
Patent
active
060578858
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
Picture information converting apparatus and method thereof and sum-of-product calculating circuit and method thereof
TECHNICAL FIELD
The present invention relates to a picture information converting apparatus and a method thereof suitable for use with for example a television receiver, a video tape recorder, and so forth, in particular, to a picture information converting apparatus and a method thereof for converting picture information with a normal resolution supplied from the outside into picture information with a high resolution and to a sum-of-products calculating circuit for allowing the number of multiplicands and the number of multipliers to be decreased without an adverse influence of calculated result.
BACKGROUND ART
Due to strong needs of improved audio-visual environments, a television system that has a higher resolution than the conventional systems was desired. As a result, a so-called high-vision system was developed. The number of scanning lines of the high-vision system (1125 lines) is more than twice of the number of scanning lines of the so-called NTSC system (525 lines). In addition, the aspect ratio of the display screen of the high-vision system (9:16) is a wide-angle more than the aspect ratio of the display screen of the NTSC system (3:4). Thus, the high-vision system provides the users with high-resolution and sense of presence.
The high-vision system, which has such excellent characteristics, cannot directly display a picture with an NTSC picture signal due to a difference of their standards. Thus, to display an NTSC picture signal on a display of the high-vision system, the rate of the picture signal is converted with a picture information converting apparatus as shown in FIG. 20.
In FIG. 20, the conventional picture information converting apparatus comprises a horizontal interpolating filter 152 and a vertical interpolating filter 153. The horizontal interpolating filter 152 horizontally interpolates an NTSC picture signal (SD data) received from an input terminal 151. The vertical interpolating filter 153 vertically interpolates the picture signal that has been horizontally interpolated.
In reality, the horizontal interpolating filter 152 has a structure as shown in FIG. 21. In the example shown in FIG. 21, the horizontal interpolating filter 152 is composed of a cascade-connected FIR filter. In FIG. 21, reference numeral 161 is an input terminal to which SD data is supplied. Reference numerals 162.sub.0 to 162.sub.m are multiplying devices that multiply SD data by filter coefficients .alpha..sub.0 to .alpha..sub.m, respectively. Reference numerals 163.sub.0 to 163.sub.m-1 are adding devices. Reference numerals 164.sub.1 to 164.sub.m-1 are delay devices by time T (where T is one sampling period). Output data that has been horizontally interpolated is supplied from an output terminal 165. The output data is supplied to the vertical interpolating filter 153.
The vertical interpolating filter 153 has the similar structure to the horizontal interpolating filter 152. The vertical interpolating filter 153 interpolates pixels in the vertical direction so as to vertically interpolate pixels of the NTSC picture signal that have been horizontally interpolated. The resultant high-vision picture signal (HD data) is supplied to a high-vision receiver. Thus, the high-vision receiver can display a picture corresponding to the NTSC picture signal.
However, the conventional picture information converting apparatus simply interpolates pixels in the horizontal and vertical directions corresponding to the NTSC picture signal. Thus, the resolution of the resultant signal that has been horizontally and vertically interpolated is the same as that of the original NTSC picture signal. In particular, when a normal picture is converted, it is normally interpolated in the vertical direction in the field thereof. In this case, since fields of the picture are not correlated, due to a conversion loss in still picture portions, the resolution of the resultant picture signal becomes lower
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Horishi Takashi
Kondo Tetsujiro
Uchida Masashi
Frommer William S.
Kostak Victor R.
Sony Corporation
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