METHODS AND APPARATUS FOR DETERMINING TONER LEVEL IN ELECTRO-PHOTOGRAPHIC PRINT ENGINES
First Claim
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1. A method for determining toner usage by a designated printing device for a document comprising a page, the method comprising:
- accumulating toner values of pixels that are ON in the page, which toner values have a plurality of different values between completely OFF to completely ON;
comparing the accumulated toner values of pixels that are ON to a predetermined toner usage for a defined number of pixels that are completely ON in a reference page that was generated on the designated printing device, and which predetermined toner usage incorporates the characteristics of the designated printing device on which the document is to be printed; and
calculating the amount of toner utilized by the page as a proportion of that used by the reference page.
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Abstract
The toner in the toner cartridge is determined by taking each of the rasterized images output by the RIP and evaluating the pixel levels over the surface thereof. The average value is determined as a percentage of the maximum toner that can be applied to the page. This is then subtracted from a toner value and a remaining toner level determined. Further, all pages of the rasterized document can be evaluated to predetermine the toner level after printing. If this falls below a predetermined minimum, printing is inhibited for that document.
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Citations
23 Claims
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1. A method for determining toner usage by a designated printing device for a document comprising a page, the method comprising:
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accumulating toner values of pixels that are ON in the page, which toner values have a plurality of different values between completely OFF to completely ON;
comparing the accumulated toner values of pixels that are ON to a predetermined toner usage for a defined number of pixels that are completely ON in a reference page that was generated on the designated printing device, and which predetermined toner usage incorporates the characteristics of the designated printing device on which the document is to be printed; and
calculating the amount of toner utilized by the page as a proportion of that used by the reference page. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for determining toner usage by a designated printing device for a multi-color document comprising a page and having different color planes, the method comprising:
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for a given plane, accumulating toner values of pixels that are ON in the page in the given plane, which toner values have a plurality of different values between completely OFF and completely ON;
comparing the accumulated toner values of pixels that are ON to a predetermined toner usage of toner associated with the given plane for a defined number of pixels that are completely ON in a reference page of the given plane defined for the designated printing device and which predetermined toner usage incorporates the characteristics of the designated printing engine on which the page is to be printed; and
calculating the amount of toner for the given plane, utilized by the page as a proportion of that used by the reference page. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for determining toner usage by a designated printing device for a rasterized document comprising a page that is to be printed on the designated printing device, the method comprising:
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fetching the rasterized document;
accumulating the values of the pixels that are ON in the page, each ON pixel having a non-zero value less than a maximum value;
comparing the accumulated values to a predetermined toner usage for a defined number of pixels that are completely ON in a reference page defined that was printed on the designated printing device and which predetermined toner usage incorporates the characteristics of the designated printing device which the rasterized document is to be printed; and
calculating the amount of toner utilized by the page as a proportion of that used by the reference page. - View Dependent Claims (14, 15, 16, 17)
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18. A method for determining toner usage for a document comprising a page prior to printing the page, the method comprising:
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determining the number of pixels that are ON in the page;
comparing the number of pixels that are ON to a predetermined toner usage for a defined number of pixels that are ON in a reference page and which predetermined toner usage incorporates the characteristics of the printing device; and
calculating the amount of toner utilized by the page as a proportion of that used by the reference page. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification