Video system for displaying lower resolution video signals on higher resolution video monitors

Claim 1

A method for converting a lower resolution video signal having a plurality of raster lines of analog data into a higher resolution video signal having a larger plurality of raster lines, the method comprising the following steps: Digitizing each analog raster line of the lower resolution video signal into a pre-selected plurality of digital values, storing the digital values in accordance with the low resolution video signal line number and position within the line, selectively reading digital values corresponding to even and odd numbered lines, interpolating corresponding digital values of adjacently numbered read odd and even lines, and assembling the interpolated lines and at least one of the odd and even numbered lines into the higher resolution video signal.

Claim 2

A method for converting a lower resolution video signal having a plurality of raster lines of analog data into a higher resolution video signal having a larger plurality of raster lines, the method comprising the following steps: Digitizing each analog raster line of the lower resolution video signal into a pre-selected plurality of digital values, storing the digital values in accordance with the low resolution video signal line number and position within the line, selectively reading digital values corresponding to even and odd numbered lines, interpolating corresponding digital values of adjacently numbered read odd and even lines, and assembling the interpolated lines and at least one of the odd and even numbered lines into the higher resolution video signal.

Claim 5

The method as set forth in one of claims 1 to 3, characterized by selectively expanding a number of digital values in each line, such that the number of digital values per line in the high resolution video signal is greater than the number of digital values per line in the lower resolution video signal.

Claim 6

The method as set forth in one of the claims 1 to 4, characterized in that the asembling is carried out such that the assembled high resolution video signal includes two fields, whereby in one of the fields, lines are arranged in a repeating sequence of a selected number of repetitions of an odd line, an average of the odd line and an adjacent even line and a selected number of repetitions of the adjacent even line.

Claim 7

The method as set forth in one of claims 1 to 5, characterized in that the assembling step, odd lines, and an interpolation of adjacent odd and even lines and even lines are cyclically assembled.

Claim 8

The method as set forth in one of claims 1 to 6, characterized in that the assembling is carried out such that the assembled high resolution signal includes two fields, one of the fields has lines arranged in a sequence which includes the first line of the low resolution data, the second line, the third line, the fourth line, an interpolation of the fifth and the sixth lines, the sixth line and an interpolation of the seventh and eighth lines.

Claim 9

A method of displaying low resolution video signals arranged in odd number line fields and even number line fields on a higher resolution CRT, characterized by the following steps: Storing even numbered line signals in first memory means and odd numbered line signals in second memory means, reading odd and even line signals from the memories one line at a time in the order in which the lines are stored, selectively interpolating adjacently numbered odd and even line signals, and assembling the read odd number, even number, and interpolated line signals in a pre-selected cyclic order to produce a high resolution video signal with a larger number of lines per picture for display on the CRT.

Claim 10

A method of displaying low resolution video signals arranged in odd number line fields and even number line fields on a higher resolution CRT, characterized by the following steps: Storing even numbered line signals in first memory means and odd numbered line signals in second memory means, reading odd and even line signals from the memories one line at a time in the order in which the lines are stored, selectively interpolating adjacently numbered odd and even line signals, and assembling the read odd number, even number, and interpolated line signals in a pre-selected cyclic order to produce a high resolution video signal with a larger number of lines per picture for display on the CRT.

Claim 11

An apparatus for enabling a lower resolution video signal to be displayed on a higher resolution video monitor, particularly for carryng out the method according to one of the claims 1 to 8, comprising digitizing means (44) for converting each received line of the lower resolution video signal (10) to a pre-­selected plurality of digital values, write address means (56) for determining a memory address corresponding to each digital value, the address being indicative of the line number within a video picture and the position along the line, memory means (20A, 20B) for storing the digital values in conjunction with the determined corresponding addresses, the memory means being operatively connected with the digitizing means and the write address means, read address means (72) for addressing the memory means (20A, 20B) to read digital values corresponding to selected odd and even numbered lines, odd line memory means (20A, 78A) for receiving and holding the odd numbered lines of digital values read from the memory means, even line memory means (20B, 78B) for receiving and holding the even numbered lines of digital values read from the holding means, interpolating means (22) for interpolating the digital values of an even numbered line from the even line memory means (78B) with the digital values of an odd numbered line from the odd line memory means (78A) to produce an interpolated line of digital values, and selecting means (24) for cyclically selecting even, odd, and interpolated lines for display on the higher resolution video monitor.

Claim 18

The apparatus as set forth in one of claims 9 to 15, characterized by magnification selecting means for selectively altering the sequence in which odd, even and interpolated data lines are assembled for display on the video monitor.