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Monochromatic representation of color images

  • US 4,688,031 A
  • Filed: 03/30/1984
  • Issued: 08/18/1987
  • Est. Priority Date: 03/30/1984
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for transforming a color image into a monochromatic image, the color image being comprised of a plurality of areas each having a color, comprising the steps of:

  • (A) providing a plurality of color pattern masks, each color pattern mask being associated with a color, and each color pattern mask representing a dot pattern comprised of a rectangular array of light and dark dots as follows(1) in a mask for the color blacki. the even numbered rows of the array are comprised of one or more repetitions of the dot pattern 0000 andii. the odd numbered rows of the array are comprised of one or more repetitions of the dot pattern 0000,(2) in a mask for the color redi. the even numbered rows of the array are comprised of one or more repetitions of the dot pattern 1011 andii. the odd numbered rows of the array are comprised of one or more repetitions of the dot pattern 1110,(3) in a mask for the color greeni. the even numbered rows of the array are comprised of one or more repetitions of the dot pattern 1100 andii. the odd numbered rows of the array are comprised of one or more repetitions of the dot pattern 0011,(4) in a mask for the color yellowi. the even numbered rows of the array are comprised of one or more repetitions of the dot pattern 1100 andii. the odd numbered rows of the array are comprised of one or more repetitions of the dot pattern 0000,(5) in a mask for the color bluei. the even numbered rows of the array are comprised of one or more repetitions of the dot pattern 1111 andii. the odd numbered rows of the array are comprised of one or more repetitions of the dot pattern 1111,(6) in a mask for the color magentai. the even numbered rows of the array are comprised of one or more repetitions of the dot pattern 1010 andii. the odd numbered rows of the array are comprised of one or more repetitions of the dot pattern 0101,(7) in a mask for the color cyani. the even numbered rows of the array are comprised of one or more repetitions of the dot pattern 1010 andii. the odd numbered rows of the array are comprised of one or more repetitions of the dot pattern 0001, and(8) in a mask for the color whitei. the even numbered rows of the array are comprised of one or more repetitions of the dot pattern 1010 andii. the odd numbered rows of the array are comprised of one or more repetitions of the dot pattern 0000,and for each area of the color image(B) generating a character mask representing the area, and(C) combining the character mask and the color pattern mask associated with the color of the area so as to replace each colored area with the dot pattern associated with the color of the area.

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