Quality of digitized images through post-scanning reregistration of their color planes

A method for reregistering a plurality of color planes representing a scanned image, the method comprising:

• a) selecting a first of a plurality of secondary planes as a next secondary plane, wherein each secondary plane is formed by a plurality of rows, each row having a plurality of pixels;
• b) setting a row of pixels in a reference plane as being a next row;
• c) choosing a pixel in the next row as being a next pixel;
• d) using the sets of interpolation coefficients corresponding to the selected secondary plane for computing the horizontal and vertical offsets for the next pixel;
• e) forming a plurality of compensating coordinates for features in the selected secondary plane using a plurality of negatives of the interpolated horizontal and vertical offsets;
• f) computing three pixel locations in the selected secondary plane that enclose the compensating coordinates;
• g) interpolating to form a corrected pixel component value;
• h) placing the corrected pixel component value in the selected revised secondary plane at the next pixel location;
• i) determining if all pixels in the row have been chosen to be the next pixel;
• if not all pixel in the row have been chosen to be the next pixel;
• j) choosing an adjacent pixel to be the next pixel in the row;
• k) repeating the steps of (d) through (i) for the next pixel;
• if all pixels in the chosen row have been chosen to be the next pixel;
• l) determining if all rows in the image have been set to be the next row;
• if not all rows in the image have been set to be the next row,
• m) choosing the next row;
• n) repeating the steps of (c) through (l) for the next pixel in the next row;
• if all rows in the image have been set to be the next row,
• o) determining if all secondary planes have been selected;
• if not all secondary planes have been selected,
• p) selecting the next secondary and the next corresponding revised secondary plane;
• q) repeating the steps of (b) through (p) for the next secondary plane and the next corresponding revised secondary plane;
• if all secondary planes have been selected,
• r) reregistering the scanned image as being composed of a plurality of revised secondary planes and the reference plane.

An article of manufacture comprising a computer usable medium having computer readable program code means embodied therein for reregistering a plurality of color planes, each color plane having a first set of data values of an intensity of irradiated light of its respective color for each of a plurality of pixels representing an image, the computer readable program code means in said article of manufacture comprising computer readable program code means for causing the computer to effect:

• choosing one of the color planes as a reference plane in respect to which a two-dimensional plane registration offset is determined, and setting the remaining color planes to be secondary planes;
• choosing a plurality of reference points on the reference plane;
• computing two-dimensional offsets of each of the secondary planes with respect to the reference plane at each of the reference points;
• performing an interpolation of the two-dimensional offsets of the reference points to obtain a first pixel offset and a second pixel offset for each of the pixels on each secondary plane, wherein the interpolation includes forming a partition defining each group of selected pixels in the reference plane and correspondingly in each secondary plane, and includes using forward and reverse discrete Fourier transforms operating on the partition;
• and
• forming a reregistered set of data values for all pixels in each of the secondary planes.

A program storage device readable by machine, tangibly embodying a program of instructions executable by the machine to perform method steps for reregistering a plurality of color planes, each color plane having a first set of data values of an intensity of irradiated light of its respective color for each of a plurality of pixels representing an image, the method comprising:

• comprising:
• choosing one of the color planes as a reference plane in respect to which a two-dimensional plane registration offset is determined, and setting the remaining color planes to be secondary planes;
• choosing a plurality of reference points on the reference plane;
• computing two-dimensional offsets of each of the secondary planes with respect to the reference plane at each of the reference points;
• interpolating the two-dimensional offsets of the reference points to obtain a first pixel offset and a second pixel offset for each of the pixels on each secondary plane, wherein the interpolation includes forming a partition defining each group of selected pixels in the reference plane and correspondingly in each secondary plane, and includes using forward and reverse discrete Fourier transforms operating on the partition;
• and
• forming a reregistered set of data values for all pixels in each of the secondary planes.

A method for reregistering a plurality of color planes representing an image, each color plane having a plurality of pixels, each pixel having a first set of data values of an intensity of irradiated light of its respective color, the method comprising:

• choosing one of the color planes as a reference plane in respect to which a two-dimensional plane registration offset is determined;
• choosing a plurality of reference points on the reference plane;
• computing two-dimensional offsets of each other color plane with respect to the reference plane at each of the reference points;
• performing a first interpolation of the two-dimensional offsets of the reference points to obtain a first pixel offset and a second pixel offset for each of the pixels on the other color planes;
• forming a reregistered set of data values for all pixels in each of the other color planes;
• forming the first set of data values using a scanning device having a group of device settings;
• and
• using the two-dimensional offsets to reregister another image having a second set of data values formed with the scanning device at conditions similar to the group of device settings.

A method for reregistering a plurality of color planes representing an image, each color plane having a plurality of pixels, each pixel having a first set of data values of an intensity of irradiated light of its respective color, the method comprising:

• choosing one of the color planes as a reference plane in respect to which a two-dimensional plane registration offset is determined;
• choosing a plurality of reference points on the reference plane;
• computing two-dimensional offsets of each other color plane with respect to the reference plane at each of the reference points;
• performing a first interpolation of the two-dimensional offsets of the reference points to obtain a first pixel offset and a second pixel offset for each of the pixels on the other color planes, and
• forming a reregistered set of data values for all pixels in each of the other color planes, wherein the step of forming includes:
• using the two-dimensional offsets to determine coordinates of compensating corrections for features in the secondary planes;
• and
• based upon the compensating coordinates, the step of forming includes, performing a second interpolation to obtain the reregistered set of data values.