Density processing method

Claim 2

A method according to claim 1. characterized in that the access addresses to the second storing means are converted by adding or subtracting a value corresponding to the designated copy density, thereby to convert the input gray level-output gray level characteristics into characteristics corresponding to the designated copy density.

Claim 3

A method according to claim 1, characterized in that the access addresses to the second storing means are so converted, if the designated copy density is higher than the reference copy density, that the rate of increase of an output gray level relative to an input gray level is higher in a lower density portion and that the higher the designated copy density is, the higher the rate of increase thereof is, thereby to convert the input gray level-output gray level characteristics into characteristics corresponding to the designated copy density.

Claim 4

A method according to claim 1, characterized in that the access addresses to the second storing means are so converted, if the designated copy density is lower than the reference copy density, that the rate of decrease of an output gray level relative to an input gray level is higher in a higher density portion and that the lower the designated copy density is, the higher the rate of decrease thereof is, thereby to convert the input gray level-output gray level characteristics into characteristics corresponding to the designated copy density.

Claim 5

A method according to claim 1, characterized in that the access addresses to the second storing means are so converted, if the designated copy density is higher than the reference copy density, that the rate of increase of an output gray level relative to an input gray level is higher in a lower density portion and that the higher the designated copy density is, the higher the rate of increase thereof is, and are so converted, if the designated copy density is lower than the reference copy density, that the rate of decrease of an output gray level relative to an input gray level is higher in a higher density portion and that the lower the designated copy density is, the higher the rate of decrease thereof is, thereby to convert the input gray level-output gray level characteristics into characteristics corresponding to the designated copy density.

Claim 8

A density processing method in which input gray level-output gray level data are previously generated and stored in first storing means, the input gray level-output gray level data are transferred to second storing means, and an address in the second storing means is specified on the basis of input gray level data inputted so that output gray level data stored in the specified address in the second storing means is outputted, characterized by comprising the steps of: converting transfer destination addresses to the second storing means corresponding to the input gray level-output gray level data depending on the designated copy finding, when blank transfer destination addresses which do not exist in transfer destination addresses obtained by the conversion exist in portions assigned small addresses of storage areas holding the input gray level-output gray level data in the second storing means, output gray level data corresponding to the blank transfer destination addresses on the basis of output gray level data corresponding to the minimum value of the transfer destination addresses obtained by the conversion; and generating new output gray level data corresponding to all the storage areas holding the input gray level-output gray level data in the second storing means from said steps to transfer the same to the second storing means.

Claim 9

A density processing method in which input gray level-output gray level data are previously generated and stored in first storing means, the input gray level-output gray level data are transferred to second storing means, and an address in the second storing means is specified on the basis of input gray level data inputted so that output gray level data stored in the specified address in the second storing means is outputted, characterized by comprising the steps of: converting transfer destination addresses to the second storing means corresponding to the input gray level-output gray level data depending on the designated copy density; finding, when blank transfer destination addresses which do not exist in transfer destination addresses obtained by the conversion exist in portions assigned large addresses in storage areas holding the input gray level-output gray level data in the second storing means, output gray level data corresponding to the blank transfer destination addresses on the basis of output gray level data corresponding to the maximum value of the transfer destination addresses obtained by the conversion; and generating new output gray level data corresponding to all the storage areas holding the input gray level-output gray level data in the second storing means from said steps to transfer the same to the second storing means.

Claim 10

A density processing method in which input gray level-output gray level data are previously generated and stored in first storing means, the input gray level-output gray level data are transferred to second storing means, and an address in the second storing means is specified on the basis of input gray level data inputted so that output gray level data stored in the specified address in the second storing means is outputted, characterized by comprising the steps of: converting transfer destination addresses to the second storing means corresponding to the input gray level-output gray level data depending on the designated copy density; finding, when blank transfer destination addresses which do not exist in transfer destination addresses obtained by the conversion exist in portions assigned small addresses in storage areas holding the input gray level-output gray level data in the second storing means, output gray level data corresponding to the blank transfer destination addresses on the basis of output gray level data corresponding to the minimum value of the transfer destination addresses obtained by the conversion; finding, when blank transfer destination addresses which do not exist in the transfer destination addresses obtained by the conversion exist in portions assigned large addresses in the storage areas holding the input gray level-output gray level data in the second storing means, output gray level data corresponding to the blank transfer destination addresses on the basis of output gray level data corresponding to the maximum value of the transfer destination addresses obtained by the conversion; and generating new output gray level data corresponding to all the storage areas holding the input gray level-output gray level data in the second storing means from said steps to transfer the same to the second storing means.

Claim 11

A density processing method in which input gray level-output gray level data are previously generated using a dither matrix and stored in first storing means, the input gray level-output gray level data are transferred to second storing means, and an address in the second storing means is specified on the basis of input gray level data inputted so that output gray level data stored in the specified address in the second storing means is outputted, characterized by comprising the steps of: converting transfer destination addresses to the second storing means corresponding to the input gray level-output gray level data depending on the designated copy density: finding, when blank transfer destination addresses which do not exist in transfer destination addresses obtained by the conversion exist in portions assigned small addresses in storage areas holding the input gray level-output gray level data in the second storing means, patterns of output gray level data corresponding to the blank transfer destination addresses on the basis of the original input gray level-output gray level data to find the output gray level data corresponding to the blank transfer destination addresses on the basis of the patterns found and output gray level data corresponding to the minimum value of the transfer destination addresses obtained by the conversion; and generating new output gray level data corresponding to all the storage areas holding the input gray level-output gray level data in the second storing means from said steps to transfer the same to the second storing means.

Claim 12

A density processing method in which input Rray level-output gray level data are previously generated using a dither matrix and stored in first storing means, the input gray level-output gray level data are transferred to second storing means, and an address in the second storing means is specified on the basis of input gray level data inputted so that output gray level data stored in the specified address in the second storing means is outputted, characterized by comprising the steps of: converting transfer destination addresses to the second storing means corresponding to the input gray level-output gray level data depending on the designated copy density; finding, when blank transfer destination addresses which do not exist in transfer destination addresses obtained by the conversion exist in portions assigned large addresses in storage areas holding the input gray level-output gray level data in the second storing means, patterns of output gray level data corresponding to the blank transfer destination addresses on the basis of the original input gray level-output gray level data to find the output gray level data corresponding to the blank transfer destination addresses on the basis of the patterns found and output gray level data corresponding to the maximum value of the transfer destination addresses obtained by the conversion; and generating new output gray level data corresponding to all the storage areas holding the input gray level-output gray level data in the second storing means from said steps to transfer the same to the second storing means.

Claim 13

In a density processing method in which input gray level-output gray level data are previously generated using a dither matrix and stored in first storing means, the input gray level-output gray level data are transferred to second storing means, and an address in the second storing means is specified on the basis of input gray level data inputted so that output gray level data stored in the specified address in the second storing means is outputted, the density processing method being characterized by comprising the steps of: converting transfer destination addresses to the second storing means corresponding to the input gray level-output gray level data depending on the designated copy density; finding, when blank transfer destination addresses which do not exist in transfer destination addresses obtained by the conversion exist in portions assigned small addresses in storage areas holding the input gray level-output gray level data in the second storing means, patterns of output gray level data corresponding to the blank transfer destination addresses on the basis of the original input gray level-output gray level data to find the output gray level data corresponding to the blank transfer destination addresses on the basis of the patterns found and output gray level data corresponding to the minimum value of the transfer destination addresses obtained by the conversion: finding, when blank transfer destination addresses which do not exist in the transfer destination addresses obtained by the conversion exist in portions assigned large addresses in the storage areas holding the input gray level-output gray level data in the second storing means, patterns of output gray level data corresponding to the blank transfer destination addresses on the basis of the original input gray level-output gray level data to find the output gray level data corresponding to the blank transfer destination addresses on the basis of the patterns found and output gray level data corresponding to the maximum value of the transfer destination addresses obtained by the conversion; and generating new output gray level data corresponding to all the storage areas holding the input gray level-output gray level data in the second storing means from said steps to transfer the same to the second storing means.