JP2010064277A5 - - Google Patents

Claims (16)

An image forming apparatus that forms an image by recording and scanning a recording head including a plurality of recording elements on a recording medium,
Detecting means for detecting the amount of registration variation between the recording head and the recording medium during a plurality of recording scans;
Calculating means for calculating a recording amount of each of the plurality of recording elements for each recording scan of the recording head according to image data;
The recording amount calculated by the calculation means is subjected to N-value processing (N is an integer of 2 or more) by applying constraint information indicating the ease of selection as the position where dots are formed for the position of each recording element. N-value conversion means for creating a dot pattern for the recording scan,
Setting means for setting the constraint information based on the recording amount calculated by the calculation means, the dot pattern created by the N-value conversion means, and the fluctuation amount detected by the detection means,
In the next printing scan, the N-value conversion unit uses the constraint information set by the setting unit. The setting means includes
The constraint information is set by further using the result of filtering the recording amount,
The image forming apparatus according to claim 1, wherein a size and a coefficient of a filter for the filter processing are set based on the amount of change.   The image forming apparatus according to claim 1, wherein the detection unit detects a fluctuation amount related to a fluctuation in a moving speed of the recording head in a recording scan. The detecting device, the image formation according the conveyance of the recording medium to be performed during the printing scan by the recording head, to claim 1 or 2, characterized by detecting the variation about the conveyance amount of the recording medium apparatus. The image forming apparatus according to claim 1, wherein the detection unit detects a fluctuation amount related to a distance between the recording head and the recording medium. The image forming apparatus according to claim 1, wherein the detection unit detects a variation amount of inclination of the recording head for each recording scan. The recording scan is to perform recording in the area by repeating the recording scan of the same area on the recording medium a plurality of times.
The setting means uses the fluctuation amount detected by the detection means, and the dot pattern phase created by the N-value conversion means with respect to the dot patterns recorded so far in the same area on the recording medium. 7. The image forming apparatus according to claim 1, wherein the constraint information is set so that the phase is in the opposite phase in the low frequency region and uncorrelated in the high frequency region. A control method of an image forming apparatus for forming an image by recording and scanning a recording head including a plurality of recording elements on a recording medium,
A detecting step for detecting a variation amount of registration between the recording head and the recording medium while performing a plurality of recording scans;
Calculating means, in accordance with the image data for each recording scan of the recording head, a calculating step of calculating each of the recording amount of said plurality of recording elements,
N-value conversion means applies N-value conversion processing (N is 2) by applying constraint information indicating the ease of selection as a position where dots are to be formed at the position of each recording element to the recording amount calculated in the calculation step. An N-value conversion step of creating a dot pattern for the recording scan,
A setting unit configured to set the constraint information based on the recording amount calculated in the calculation step, the dot pattern created in the N-value conversion step, and the fluctuation amount detected in the detection step; And
In the next printing scan, the restriction information set in the setting step is used in the N-value conversion step. The setting step includes
The constraint information is set by further using the result of filtering the recording amount,
9. The method of controlling an image forming apparatus according to claim 8, wherein a filter size and a coefficient for the filter processing are set based on the amount of change.   10. The method of controlling an image forming apparatus according to claim 8, wherein the detecting step detects a fluctuation amount relating to a change in a moving speed of the recording head in a recording scan. Said detecting step, the image forming according to claim 8 or 9, characterized in that said in the conveyance of the recording medium to be performed during the printing scan by the recording head, for detecting the amount of change regarding the transport amount of said recording medium Control method of the device. 10. The method of controlling an image forming apparatus according to claim 8, wherein the detecting step detects a fluctuation amount related to a distance between the recording head and the recording medium. 10. The method of controlling an image forming apparatus according to claim 8, wherein the detecting step detects a variation amount of inclination of the recording head for each recording scan. The recording scan is to perform recording in the area by repeating the recording scan of the same area on the recording medium a plurality of times.
The setting step uses the fluctuation amount detected in the detection step, and the dot pattern phase created in the N-value conversion step with respect to the dot pattern recorded so far in the same area on the recording medium. The method of controlling an image forming apparatus according to claim 8, wherein the constraint information is set so that the phase is opposite in the low frequency region and uncorrelated in the high frequency region. The program for making a computer perform each process of the control method of the image forming apparatus of any one of Claims 8 thru | or 14. 15. A computer-readable storage medium storing a program for causing a computer to execute each step of the control method for an image forming apparatus according to claim 8.