Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
320 words
Apparatus for converting first image data, comprising a matrix of rows and columns of image pels each comprising grey scale data of a corresponding point on an original image, to a matrix of second image data of different resolution, the apparatus comprising: means (34 to 37) for forming a first scale factor corresponding to the ratio of the resolution of the first image to that of the second image in the row direction, means (44 to 47) for forming a second scale factor corresponding to the ratio of the resolution of the first image to that of the second image in the column direction, means (38, 39) for multiplying the row coordinate of each successive column of second image pels by the first scale factor to give, in each case, a whole number TAB# and a fractional remainder AX, means (40) for storing each successive TAB# and AX, means (48, 49) for multiplying the column coordinate of each successive row of second image pels by the second scale factor to give, in each case, a whole number NEXT PAIR and a fractional remainder ΔY, means (50) for storing each successive NEXT PAIR and ΔY, means (52 to 54, 56, 57, 59) responsive to the stored values of TAB#, ΔX and NEXT PAIR, ΔY to identify, for each different combination of TAB# and NEXT PAIR, a set of four first image pels which constitute the nearest neighbours to a respective second image pel, and a look-up table (64) which is accessed in respect of each set of four first image pels so identified at a location determined by the combination of grey scale values of the four first image pels and by the remainders A X and AY associated with the whole numbers TAB# and NEXT PAIR from which the four first image pels were identified, such location having stored therein the grey scale level of the respective second image pel.
Claim 2
Dependent Claim
320 words
Apparatus for converting first image data, comprising a matrix of rows and columns of image pels each comprising grey scale data of a corresponding point on an original image, to a matrix of second image data of different resolution, the apparatus comprising: means (34 to 37) for forming a first scale factor corresponding to the ratio of the resolution of the first image to that of the second image in the row direction, means (44 to 47) for forming a second scale factor corresponding to the ratio of the resolution of the first image to that of the second image in the column direction, means (38, 39) for multiplying the row coordinate of each successive column of second image pels by the first scale factor to give, in each case, a whole number TAB# and a fractional remainder AX, means (40) for storing each successive TAB# and AX, means (48, 49) for multiplying the column coordinate of each successive row of second image pels by the second scale factor to give, in each case, a whole number NEXT PAIR and a fractional remainder ΔY, means (50) for storing each successive NEXT PAIR and ΔY, means (52 to 54, 56, 57, 59) responsive to the stored values of TAB#, ΔX and NEXT PAIR, ΔY to identify, for each different combination of TAB# and NEXT PAIR, a set of four first image pels which constitute the nearest neighbours to a respective second image pel, and a look-up table (64) which is accessed in respect of each set of four first image pels so identified at a location determined by the combination of grey scale values of the four first image pels and by the remainders A X and AY associated with the whole numbers TAB# and NEXT PAIR from which the four first image pels were identified, such location having stored therein the grey scale level of the respective second image pel.