IMAGE PROCESSING APPARATUS AND METHOD, THRESHOLD MATRIX GENERATION DEVICE AND METHOD, AND PROGRAM

To further equalize the frequency of use of nozzles in recording an image with a plurality of nozzle rows.SOLUTION: An image processing apparatus generates data for forming an image represented by input image data on a recording medium by using a recording head having nozzle rows arranged in plurali...

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Bibliographic Details
Main Author OTANI RYOSUKE
Format Patent
LanguageEnglish
Japanese
Published 17.01.2024
Subjects
CORRECTION OF TYPOGRAPHICAL ERRORS
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME
LINING MACHINES
PERFORMING OPERATIONS
PICTORIAL COMMUNICATION, e.g. TELEVISION
PRINTING
SELECTIVE PRINTING MECHANISMS
STAMPS
TRANSPORTING
TYPEWRITERS
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Summary:To further equalize the frequency of use of nozzles in recording an image with a plurality of nozzle rows.SOLUTION: An image processing apparatus generates data for forming an image represented by input image data on a recording medium by using a recording head having nozzle rows arranged in plurality (L rows) in a second direction and each having a plurality of nozzles arranged in a first direction. The image processing apparatus converts the input image data into a first dot pattern representing dots recorded by the recording head based on a threshold matrix, assigns the dots in the first dot pattern to each of the nozzle rows so that the nozzles of the recording head are used in a period of the L rows, and obtains a second dot pattern representing recording dots for every nozzle row. The power spectrum of a frequency space in the first dot pattern has blue noise characteristics or green noise characteristics in which the power in a low-frequency band is reduced, and the powers of a frequency corresponding to the period of the L rows and its multiple frequency in the second direction are reduced.SELECTED DRAWING: Figure 3 【課題】複数のノズル列で画像を記録する際の各ノズルの使用頻度をより均等にする。【解決手段】画像処理装置は、第１の方向に複数のノズルが配列されたノズル列が第２の方向に複数（Ｌ列）配置された記録ヘッドを用いて入力画像データにより表される画像を記録媒体上に形成するためのデータを生成する。画像処理装置は、入力画像データを、閾値マトリクスに基づいて記録ヘッドにより記録されるドットを表す第１のドットパターンに変換し、記録ヘッドの各ノズルがＬ列の周期で用いられるように第１のドットパターンのドットをノズル列の各々に割り当て、ノズル列ごとの記録ドットを表す第２のドットパターンを得る。第１のドットパターンの周波数空間のパワースペクトルは、低周波帯域のパワーが抑制されたブルーノイズ特性またはグリーンノイズ特性を有し、第２の方向の、Ｌ列の周期に対応する周波数とその逓倍の周波数のパワーが抑えられている。【選択図】 図３
Bibliography:Application Number: JP20220107357