Image processing apparatus, image processing method, and storage medium for removing a designated color from an image
AssigneeCanon Kabushiki Kaisha
InventorsKoya Shimamura, Kimimori Eguchi
Life of this patent
Estimating the term…
Abstract
An image processing apparatus receives designation of a target color to be removed, obtains the hue and chroma of the designated color, determines the target color based on the obtained hue and chroma, and replaces the signal value of a pixel contained in image data and having a signal value corresponding to a color falling within a predetermined range containing the designated color with a signal value indicating white, thereby performing color removal.
Claims19
An image processing apparatus comprising:
- a receiving unit configured to receive designation of a color to be replaced with a white pixel in a scanned image;
- and
- a replacing unit configured to replace a pixel having a first color whose chroma is higher than a first threshold and whose hue falls within a hue range corresponding to the designated color, with the white pixel if the designated color is a chromatic color, wherein the replacing unit replaces a pixel having a second color, whose chroma is not higher than a second threshold, with the white pixel if the designated color is black.
An image processing method comprising:
- receiving designation of a color to be replaced with a white pixel in a scanned image;
- replacing a pixel having a first color, whose chroma is higher than a first threshold and whose hue falls within a hue range corresponding to the designated color, with a white pixel if the designated color is a chromatic color;
- and
- replacing a pixel having a second color, whose chroma is not higher having not more than a second threshold, with a chroma larger than zero with the white pixel if the designated color is black.
A non-transitory computer-readable storage medium storing a program, which causes a computer to execute an image processing method by executing the program, the method comprising:
- receiving designation of a color to be replaced with a white pixel in a scanned image;
- replacing a pixel having a first color, whose chroma is higher than a first threshold and whose hue falls within a hue range corresponding to the designated color, with the white pixel if the designated color is a chromatic color;
- and
- replacing a pixel having a second color, whose chroma is not higher than a second threshold, with the white pixel if the designated color is black.
Dependencies are inferred from the claim text.