Abstract: A system is disclosed. The system includes at least one physical memory device to store medium classification logic and one or more processors coupled with the at least one physical memory device to execute the medium classification logic to receive optical density (OD) measurement data corresponding to application of a halftone pattern using ink on a print medium in a printing system, receive ink deposition measurement data corresponding to application of the halftone pattern using the ink in a printing system, determine a set of distribution function parameters based on the OD measurement data and the ink deposition measurement data, apply the set of distribution function parameters to machine learning logic trained to classify the print medium and classify the print medium as a first of a plurality of print medium categories based on the machine learning logic.

Abstract: A system is disclosed. The system at least one physical memory device to store ink estimation logic and one or more processors coupled with the at least one physical memory device, to execute the ink estimation logic to receive a histogram for each of a plurality of color planes, receive one or more printer system settings and generate estimated ink usage data for each of the plurality of color planes based on the histograms and the one or more printer system settings.

Abstract: A system is disclosed. The system includes at least one physical memory device to store medium classification logic and one or more processors coupled with the at least one physical memory device to execute the medium classification logic to receive optical density (OD) measurement data corresponding to application of a halftone pattern using ink on a print medium in a printing system, receive ink deposition measurement data corresponding to application of the halftone pattern using the ink in a printing system, determine a set of distribution function parameters based on the OD measurement data and the ink deposition measurement data, apply the set of distribution function parameters to machine learning logic trained to classify the print medium and classify the print medium as a first of a plurality of print medium categories based on the machine learning logic.

Abstract: Systems and methods are provided for image scaling with efficient pixel resolution conversion. One embodiment is an image scaling system that includes a processor that receives an instruction to scale an input image having a first resolution by a scaling ratio to create an output image having a second resolution, and determines a rational fraction approximation of the scaling ratio to obtain a numerator integer representing a first block of consecutive pixels in the output image and a denominator integer representing a second block of consecutive pixels in the input image. The processor also calculates pixel values of the first block of pixels by: bit shifting pixel values of the second block of pixels, obtaining a sum of bit shifting operations of neighboring pixel values of the second block of pixels, and correcting the sum with a correction value to compensate for rounding errors in the bit shifting.

Abstract: A system is disclosed. The system at least one physical memory device to store ink deposition curve compute logic and one or more processors coupled with the at least one physical memory device, to execute the ink deposition curve compute logic to receive a histogram for each of a plurality of color planes, receive ink measurement data for each of the plurality of color planes, compute ink deposition curve data for each of the plurality of color planes based on the histograms and the ink measurement data and transmit the ink deposition curve data.

Abstract: Systems and methods are provided for printhead waveform adjustment. One embodiment is a system that includes a controller that correlates a series of printhead waveforms input to a printhead with a series of optical density values output by the printhead. The controller determines a single target optical density for the printheads based on an average optical density of the printheads. Also, for each of the printheads, the controller determines a functional relationship between the parameter of the printhead waveforms input to the printhead and the optical density values output by the printhead, and determines a target printhead waveform parameter for the printhead based on the single target optical density input to an inverse of the functional relationship. The controller updates printhead settings to include information of the target printhead waveform parameter determined for each of the printheads for applying to the printheads to output ink at consistent optical density.

Abstract: A system is disclosed. The system at least one physical memory device to store ink deposition curve compute logic and one or more processors coupled with the at least one physical memory device, to execute the ink deposition curve compute logic to receive a histogram for each of a plurality of color planes, receive ink measurement data for each of the plurality of color planes, compute ink deposition curve data for each of the plurality of color planes based on the histograms and the ink measurement data and transmit the ink deposition curve data.

Abstract: A system is disclosed. The system at least one physical memory device to store ink estimation logic and one or more processors coupled with the at least one physical memory device, to execute the ink estimation logic to receive a histogram for each of a plurality of color planes, receive one or more printer system settings and generate estimated ink usage data for each of the plurality of color planes based on the histograms and the one or more printer system settings.

Abstract: Systems and methods are provided for image scaling with efficient pixel resolution conversion. One embodiment is an image scaling system that includes a processor that receives an instruction to scale an input image having a first resolution by a scaling ratio to create an output image having a second resolution, and determines a rational fraction approximation of the scaling ratio to obtain a numerator integer representing a first block of consecutive pixels in the output image and a denominator integer representing a second block of consecutive pixels in the input image. The processor also calculates pixel values of the first block of pixels by: bit shifting pixel values of the second block of pixels, obtaining a sum of bit shifting operations of neighboring pixel values of the second block of pixels, and correcting the sum with a correction value to compensate for rounding errors in the bit shifting.

Abstract: Systems and methods are provided for test patterns that detect misalignment. One embodiment is a printer that includes a marking engine having rows of nozzles. The rows are separated along a Y direction, and each row of nozzles extends in an X direction. The printer also includes a controller that directs the marking engine to print multiple bands of a test pattern. Each band is printed by selecting nozzles in a first row, selecting nozzles in a second row that occupy adjacent X positions to the selected nozzles of the first row, and forming a band having multiple marks. Each mark includes a continuous line from a nozzle in the first row and a continuous line from a nozzle in the second row. Each band of the test pattern is printed by ejecting ink from nozzles in a different combination of nozzles.

Abstract: A printing system is disclosed. The printing system includes a printer controller to receive optical density (OD) measurement data corresponding to application of a halftone pattern using ink on a medium in a printing system and calculate a predicted OD versus normalized ink coverage relationship for the printing system based on the received OD measurement data.

Abstract: Embodiments described herein provide determining an ink drop size. One embodiment comprises a system that includes a printhead fluidly coupled to an ink input supply, and a controller to direct the printhead to eject drops of ink of an ink drop type. The system further includes an ink output estimator to estimate an ink output amount ejected from the printhead based on an estimated quantity of the ejected drops of ink of the ink drop type and an estimated size of the drop type, and an ink measurement device to measure an ink input amount provided by the ink input supply to the printhead. The system also includes a correction module to adjust the estimated size of the drop type based on the ink output amount and the ink input amount for a printing operation.

Abstract: A printer is described having a control unit and/or image processor to determine a number of pixels by which to scale an image along an axis of the image, wherein, the scaling of the image is less than 10% of the image along the axis. The control unit and/or image processor is also to identify locations along the axis equal to the number. The control unit and/or image processor is also to remove a region of more than one pixel along the axis at each of the locations. The control unit and/or image processor is also to insert a region of more than one pixel along the axis at each of the locations, where, a difference between pixels removed and pixels inserted accounts for the number.

Abstract: A printer is described having a control unit and/or image processor to determine a number of pixels by which to scale an image along an axis of the image, wherein, the scaling of the image is less than 10% of the image along the axis. The control unit and/or image processor is also to identify locations along the axis equal to the number. The control unit and/or image processor is also to remove a region of more than one pixel along the axis at each of the locations. The control unit and/or image processor is also to insert a region of more than one pixel along the axis at each of the locations, where, a difference between pixels removed and pixels inserted accounts for the number.

Abstract: A printer is described having a control unit and/or image processor to determine a number of pixels by which to scale the image along an axis of the image, wherein, the scaling of the image is less than 10% of the image along the axis. The control unit and/or image processor is to identify locations along the axis equal to the number. The identifying includes determining regions of lesser activity. The control unit and/or image processor is to remove a region of more than one pixel along the axis at each of the locations. The control unit and/or image processor is to insert a region of more than one pixel along the axis at each of the locations, wherein, a difference between pixels removed and pixels inserted accounts for the number.

Abstract: A method is described that entails printing a series of test patterns. Each test pattern has its own respective set of outer lines and set of inner lines. The series of test patterns have a different intended spacing between their respective inner lines and outer lines. The intended spacing of each test pattern is printed in a manner that correlates the intended spacing of each test pattern with its test pattern. Each of the outer lines are printed with a first print source and each of the inner lines printed with a second print source. Inner lines of a first set of the test patterns are shorter than inner lines of a second set of the test patterns to enhance resolution at which differences in the spacings between respective inner and outer lines of same test patterns are able to be detected across different test patterns.

Abstract: A method is disclosed. The method includes receiving an image, upsampling the image, eroding the upsampled image to compensate for dot gain and scaling the eroded image to scale the image to a desired size.

Abstract: A method is disclosed. The method includes receiving an image, upsampling the image, eroding the upsampled image to compensate for dot gain and scaling the eroded image to scale the image to a desired size.

Abstract: A method is disclosed. The method includes receiving a first image as a binary periodic Halftone Image (HTI) with a first resolution, scaling the image to render a second image as a continuous-tone HTI with a second resolution, and iteratively processing the scaled image to render a third image as a multibit aperiodic HTI.

Abstract: A method is disclosed. The method includes receiving an image, upsampling the image, eroding the upsampled image to compensate for dot gain and scaling the eroded image to scale the image to a desired size.