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Advanced Media Detection for Copy and Photo Printing Functions

Enhance media type detection for better copy and photo printing functions. Improvements in UI, paper type detection, and more reliable calibration methods.

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Advanced Media Detection for Copy and Photo Printing Functions

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  1. Pi Auto Media Type Detectionfor AiO A/A4 Copy and Standalone Photo Printing Functions Pi Project Team March 20, 2007

  2. Background Story • Customer selectable paper type is vulnerable • Customers don’t know what “Plain Paper or Photo Paper” button was referring to: original media or output media • No $ for Legolas sensor, Legolas sensor is not 100% correct. • Legolas sensor was used only to confirm or reject plain or photo paper type in the copy function

  3. Background Story • Need to remove a button to allow space for the power button (moved from front faceplate), and enable a simpler UI for cutomers Pi UI Fullhouse UI

  4. Application/specific cases • Standalone copy or photo printing from card slots and • Only on large (A/A4) size media; small media (4x6 or L size depending local setting) defaults to photo media

  5. Usage Model Pi usage model not available, this is to give a sense of the media detection • Is applied to no more than 35% of the total printed pages • Will mostly need to detect 3% (=4% x 75%) photo media over the machine life time Photo card printing information not available, estimated to be a small percentage of everyday printing

  6. Technical Model

  7. Math Model • One time factory calibration • No-Load Calibration before each job • Back EMF Correction • Discriminant Analysis: probability result • Compare result to threshold value to determine if Plain or Photo

  8. Calibration Problem:Plain and Photo Paper PWM Pick Profiles can be Indistinguishable Due to Variations in: • Motor temperature • Motor torque constants • Part dimensions and friction • Ambient temperature and humidity • Power supply voltage • Life (wear) Proposed Solution:Perform one-time factory no-load calibration to measure room temp baseline Perform a No-Load PWM Calibration before every Job

  9. No-Load PWM Calibration Details: • Average PWM is measured before each pick • at a no-load shaft speeds of 8 ips and 20 ips. • The PWM values are corrected for back-EMF to approximate • the effective no-load system torque constant. • The resultant linear no-load PWM-to-Torque relationship is used • to convert all raw pick profile data into the equivalent calibrated no-load torque. As a Result: The differences between each calibrated pick profile should now be mostly due to paper differences only.

  10. Calibration Example Using Hot Motor Data:

  11. Cont: Calibration Example Using Hot Motor Data:

  12. Discriminant Analysis:The following calculations are performed on the calibrated profile datato the select zones (1, 2, 4, 7): • Mean • Standard Deviation

  13. Discriminant AnalysisSample Equation:

  14. Latest Classification Results

  15. Gen II Improvements for Rho: • determine 3 thresholds--one favoring plain, one optimized, one favoring photo. • choose one of the 3 different thresholds based on the customer's selection of quality setting. • choose one of the 3 different thresholds based on the customer's selection of size. • choose one of the 3 different thresholds based on whether the customer is making a copy, using the "reprints" mode, or printing from a card. • choose one of the 3 different thresholds based on whether the customer is making a color copy or a b/w copy. • fix the problem of random picks at plain paper pick speed. • increase the constant pick speed from the current 6? ips to a more stable 8 ips. • detect multi-picks. • detect paper-out condition (as differentiated from a no-pick). • add a plain paper pick calibration to EOL. • add a plain paper pick calibration customer walk-through during initial setup (OOBE), or simply use the paper pick from the first pen calibration as the plain paper calibration profile.

  16. Gen II Improvements for Rho cont.: • add a plain paper pick re-calibration accessible to the customer from the service menu, or simply re-calibrated every time a pen alignment page is printed (by assuming plain paper, and ignore if it's clearly not plain paper). • tweak the thresholds adaptively based on customer usage--for example, if customer makes a draft mode b/w copy, they are most likely using plain paper, so use that pick's sqdistdiff to adjust the thresholds accordingly. • communicate the detected paper type to the UI, so that it can be displayed in the cgd during the copy job (see Rho's latest flash UI demo). • tweak the thresholds adaptively when "grey" type media is detected based on customer's response to a question during the copy job underway screen on the cgd, "glossy (matte) paper detected, correct?" and have the buttons mapped to "yes" and "no". • tweak the thresholds based on customer's region. • detect 4x6 vs 5x7 for small media. • use customer's size selection history of 4x6 and 5x7 to adaptively optimize/tweak the 4x6 vs 5x7 threshold.

  17. Pi Team Credits: Brad Short858.655.6918 Fahad Ahmad 858.655.3230 Ardi Othman 011.65.6727.1568 Tushar Radke 011.65.6727.2906 Jeff Borra 858.655.4417

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