Image size transforming apparatus, method and record medium storing image size transform program therein

An image size transforming apparatus comprising:

• a DDA processing unit which from the array of a predetermined number of pixels of an original image, creates a bit pattern indicative of the execution or nonexecution of a pixel copy onto a contracted image or of an overlapping pixel copy onto an expanded image, by a digital differential analysis;
• a pattern table which stores therein a plurality of different bit patterns obtained by shifting said bit pattern created by said DDA processing unit in series by a predetermined number of bits;
• and
• a copy processing unit which when extracting a pixel string of said bit pattern length from said original image to transform it into a contracted image or an expanded image, iterates processing for selecting a specific bit pattern from said pattern table by use of a random number to transform pixels of said original image into pixels of said contracted image or of said expanded image.

An image size transforming method comprising:

• an initial value setting step which includes setting a random number based initial value as a sum total initial value of a digital differential analysis (DDA);
• and
• a DDA processing step which includes creating an image expanded or contracted from an original image by said digital differential analysis;
• said initial value setting step including determining a random number for each pixel initial position of said original image and defining the remainder when said random number is divided by the original image size as a DDA sum total initial value;
• said DDA processing step including, upon the image contraction, figuring out a DDA sum total at a current pixel position by adding a contracted image size to an initialized DDA sum total, at an original image pixel initial position, but to a DDA sum total figured out at an immediately previous pixel position, at the other pixel positions, said DDA processing step including, if said DDA sum total is not less than the original image size, copying pixels at the current pixel position onto a contracted image and defining the result of subtraction of the image size from the current DDA sum total as the DDA sum total at the next pixel position, said DDA processing step including, if said DDA sum total is less than the original image size, thinning out pixels at the current pixel position without copy thereof and defining the current DDA sum total as the DDA sum total at the next pixel position, said DDA processing step including iterating the above processings.

An image size transforming method comprising:

• a DDA processing step which includes, from the array of a predetermined number of pixels of an original image, creating a bit pattern indicative of the execution or nonexecution of a pixel copy onto a contracted image or of an overlapping pixel copy onto an expanded image, by a digital differential analysis (DDA);
• a table creating step which includes creating a pattern table that stores therein a plurality of different bit patterns obtained by shifting said bit pattern created in said DDA processing step in series by a predetermined number of bits;
• and
• a copy processing step which includes, when extracting a pixel string of said bit pattern length from said original image to transform it into a contracted image or an expanded image, iterating processing for selecting a specific bit pattern from said pattern table by use of a random number to transform pixels of said original image into pixels of said contracted image or of said expanded image.

A computer readable record medium storing an image size transforming program therein, said image size transforming program comprising:

• an initial value setting step which includes setting a random number based initial value as a sum total initial value of a digital differential analysis (DDA);
• and
• a DDA processing step which includes creating an image expanded or contracted from an original image by said digital differential analysis;
• said initial value setting step including determining a random number for each pixel initial position of said original image and defining the remainder when said random number is divided by the original image size as a DDA sum total initial value;
• said DDA processing step including, upon the image contraction, figuring out a DDA sum total at a current pixel position by adding a contracted image size to an initialized DDA sum total, at an original image pixel initial position, but to a DDA sum total figured out at an immediately previous pixel position, at the other pixel positions, said DDA processing step including, if said DDA sum total is not less than the original image size, copying pixels at the current pixel position onto a contracted image and defining the result of subtraction of the image size from the current DDA sum total as the DDA sum total at the next pixel position, said DDA processing step including, if said DDA sum total is less than the original image size, thinning out pixels at the current pixel position without copy thereof and defining the current DDA sum total as the DDA sum total at the next pixel position, said DDA processing step including iterating the above processings.

A computer readable record medium storing an image size transforming program therein, said image size transforming program comprising:

• a DDA processing step which includes, from the array of a predetermined number of pixels of an original image, creating a bit pattern indicative of the execution or nonexecution of a pixel copy onto a contracted image or of an overlapping pixel copy onto an expanded image, by a digital differential analysis (DDA);
• a table creating step which includes creating a pattern table that stores therein a plurality of different bit patterns obtained by shifting said bit pattern created in said DDA processing step in series by a predetermined number of bits;
• and
• a copy processing step which includes, when extracting a pixel string of said bit pattern length from said original image to transform it into a contracted image or an expanded image, iterating processing for selecting a specific bit pattern from said pattern table by use of a random number to transform pixels of said original image into pixels of said contracted image or of said expanded image.