Resolution conversion module, printer driver with resolution conversion module, and image resolution conversion method

A resolution conversion module which is installed in printer driver when it is used, and converts a resolution of image data, comprising the steps of:

• receiving information representing resolutions before and after conversion from the printer driver;
• calculating a magnification or reduction value for each pixel of an original image before conversion on the basis of the received information;
• receiving information of a processing region, which is segmented with reference to an image size after conversion, from the printer driver;
• obtaining a region on the original image before conversion corresponding to the segmented processing region on the basis of the magnification or reduction values for pixels;
• passing information of the obtained region on the original image to the printer driver, requesting the printer driver to transfer original image data, and receiving the original image data of the obtained region therefrom;
• changing a size of an image on the basis of the magnification or reduction values for pixels for each obtained region on the original image;
• and
• requesting the printer driver to take size-changed data, and passing the data of the region after resolution conversion,
• wherein the resolution after conversion is the resolution of a printer, and the processing region which is segmented with reference to the image size after conversion is a band region.

A printer driver installed with a resolution conversion module for image data,

• said resolution conversion module comprising the steps of:
• receiving information representing resolutions before and after conversion from said driver;
• calculating a magnification or reduction value for each pixel of an original image before conversion on the basis of the received information;
• receiving information of a processing region, which is segmented with reference to an image size after conversion, from said driver;
• obtaining a region on the original image before conversion corresponding to the segmented processing region on the basis of the magnification or reduction values for pixels;
• passing information of the obtained region on the original image to said driver, requesting said driver to transfer original image data, and receiving the original image data of the obtained region therefrom;
• changing a size of an image on the basis of the magnification or reduction values for pixels for each obtained region on the original image;
• and
• requesting said driver to take size-changed data, and passing the data of the region after resolution conversion.

An image resolution conversion method for converting a resolution of image data, wherein when there are a resolution conversion module for performing resolution conversion and a printer driver that requires resolution conversion of image data, information representing resolutions before and after conversion and information of a processing region segmented with reference to an image size after conversion are passed from said printer driver to said resolution conversion module,

• said resolution conversion module calculates a magnification or reduction value for each pixel of an original image before conversion on the basis of the information representing the resolutions before and after conversion, obtains a region on the original image before conversion corresponding to the segmented processing region on the basis of the magnification or reduction values for pixels, passes the information of the obtained region to said printer driver, and requests said printer driver to transfer original image data of the region on the original image, and when the original image data of the region is passed from said printer driver to said resolution conversion program, said resolution conversion program changes a size of an image on the basis of the magnifications or reduction values for pixels for each obtained region on the original image, and sends back size-changed image data to said printer driver.

A computer readable memory that stores a program for converting a resolution of image data, having

• a resolution conversion module for converting the resolution, and a printer driver with said resolution conversion module,
• said resolution conversion module comprising:
• a magnification generation module for calculating a magnification or reduction value for each pixel of an original image before conversion on the basis of information representing resolutions before and after conversion;
• a corresponding region calculation module for calculating a region on the original image before conversion corresponding to a processing region, which is segmented with reference to an image size after conversion, on the basis of the magnification or reduction values for pixels;
• a size change processing module for changing a size of original image data of the calculated region on the basis of the magnification or reduction values for pixels;
• and
• an interface module for receiving the information representing the resolutions before and after conversion, the information of the segmented processing region, and the original image data of the calculated region from said printer driver, and passing the information of the calculated region and data after resolution conversion of the segmented region to said printer driver.