US 5,847,768 A · Apparatus for converting screen aspect ratio

Abstract

An improved screen aspect ratio conversion apparatus displays a 4:3 broadcast signal on a screen having an aspect ratio of 16:9 by expanding the screen aspect ratio to 4:3 in an interpolation unit and by removing a portion exceeding a certain range of the screen aspect ratio of 16:9. The apparatus includes a line interpolation unit for multiplying the first three lines and next three lines of video data by different coefficient values; a line selection unit for selecting at every line video data interpolated by the line interpolation unit in accordance with a selection control signal and video data obtained by a data storing unit; a sum unit for summing video data obtained by the line selection unit; a horizontal synchronous count unit for counting a start portion of a horizontal synchronous signal to be zoomed and generating a write enable signal when the horizontal synchronous signal reaches a zooming region; and a field memory unit for storing video data which are zoomed at 3:4 by the data sum unit in accordance with a write enable signal of the horizontal synchronous count unit. The apparatus further includes a side panel inserting unit for inserting a luminance level value of a side panel into video data from the second storing unit in accordance with selection control signals.

Claims33

Dependent claims

An apparatus for converting a screen aspect ratio, comprising:

scanning line processing means for generating a write/read signal and first and second selection control signals in accordance with horizontal synchronous signals inputted thereto;
data storing means for selectively storing digital video data in accordance with the first selection control signal and the write/read signal generated by the scanning line processing means;
line interpolation means for multiplying video data with respect to the current and next three lines of data outputted from the data storing means by coefficient values;
line selection means for sequentially selecting at every line video data interpolated by the line interpolation means, and video data obtained by the data storing means, in accordance with the second selection control signal;
sum means for summing video data obtained by the line selection means;
horizontal synchronous count means for counting a start portion of a horizontal synchronous signal to be zoomed and for generating a write enable signal when the horizontal synchronous signal reaches a zooming region;
and
field memory means for storing video data which are zoomed to 3:4 by the data sum means in accordance with the write enable signal of the horizontal synchronous count means.

5 more elements

An apparatus for converting a screen aspect ratio, comprising:

pixel compression control means for generating first through fourth selection control signals and a writing enable signal in accordance with horizontal synchronous signals inputted thereto;
first data storing means for selectively storing video data inputted thereto in accordance with the fourth selection control signal outputted from the pixel compression control means;
pixel compression means for combining video data outputted from the first data storing means into three pixels by combining the video data at every fourth pixel and selectively outputting the combined video data in accordance with the second selection control signal of the pixel compression control means;
second data storing means for selectively storing pixel data obtained by the pixel compression means in accordance with the write enable signal of the pixel compression control means;
side panel inserting means for inserting a luminance level value of a side panel, which is previously set in accordance with a detection of an average pixel level or an average beam current level, into the pixel data inputted thereto from the second data storing means in accordance with the third and fourth selection control signals of the pixel compression control means;
and
field memory means for storing an output of the side panel inserting means and outputting a horizontally compressed digital video signal.

4 more elements

Dependencies are inferred from the claim text.

Apparatus for converting screen aspect ratio

Life of this patent

Apparatus for converting screen aspect ratio

Life of this patent

Abstract

Claims33