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US09087291B2 Image processing apparatus and method setting thresholds of dither patterns based on density range and generating binary data depending on thresholds of target pixels 有权
图像处理装置和方法基于密度范围设置抖动图案的阈值，并根据目标像素的阈值生成二进制数据

Image processing apparatus and method setting thresholds of dither patterns based on density range and generating binary data depending on thresholds of target pixels
Abstract:
An image processing apparatus includes a generation unit; wherein a first dither pattern and a second dither pattern have same threshold values that are set for same pixels in a first gradation range, and have different threshold values that are set for same pixels in a second gradation range that exceeds the first gradation range; and the generation unit sets a first threshold value for forming dots of the first dither pattern, and generates a first binary data according to whether or not a threshold value corresponding to a target pixel of the first dither pattern is included in the first threshold value, and sets a second threshold value for forming dots of the second dither pattern, and generates a second binary data according to whether or not a threshold value corresponding to a target pixel of the second dither pattern is included in the second threshold value.
Abstract(Chinese):

一种图像处理装置，包括：生成单元; 其中第一抖动图案和第二抖动图案具有与第一灰度范围中的相同像素相同的阈值，并且对于超过第一灰度范围的第二灰度范围中的相同像素具有不同的阈值; 并且生成单元设置用于形成第一抖动图案的点的第一阈值，并且根据与第一抖动图案的目标像素对应的阈值是否包括在第一阈值中来生成第一二进制数据， 并且设置用于形成第二抖动图案的点的第二阈值，并且根据与第二抖动图案的目标像素对应的阈值是否包括在第二阈值中来生成第二二进制数据。

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