Abstract: In an example, a method of gamut mapping may include generating a plurality of color values in a first color space based on a plurality of measured color values in a second color space using a color specification that maps color values corresponding to the second color space to color values corresponding to the first color space. The method may include generating a second-order or higher response-surface regression model that maps color values corresponding to the first color space to color values corresponding to the first color space.

Abstract: In an example, a method of gamut mapping may include generating a first second-order or higher response-surface regression model that maps color values corresponding to the second color space to color values corresponding to the first color space. The method may include generating predicted color values for measured color values by inputting measured color values into the first second-order or higher response-surface regression model. The method may include generating, based on predicted color values and a plurality of color values, a second second-order or higher response-surface regression model that maps predicted color values output by the first second-order or higher response-surface regression model corresponding to the first color space to color values corresponding to the first color space.

Abstract: In an example, a method of gamut mapping may include generating a first second-order or higher response-surface regression model that maps color values corresponding to the second color space to color values corresponding to the first color space. The method may include generating predicted color values for measured color values by inputting measured color values into the first second-order or higher response-surface regression model. The method may include generating, based on predicted color values and a plurality of color values, a second second-order or higher response-surface regression model that maps predicted color values output by the first second-order or higher response-surface regression model corresponding to the first color space to color values corresponding to the first color space.

Abstract: In an example, a method of gamut mapping may include generating a plurality of color values in a first color space based on a plurality of measured color values in a second color space using a color specification that maps color values corresponding to the second color space to color values corresponding to the first color space. The method may include generating a second-order or higher response-surface regression model that maps color values corresponding to the first color space to color values corresponding to the first color space.

Abstract: In an example, a method of calibrating a white point of a display may include receiving a plurality of color values, and one or more measured color values corresponding to one or more colors displayed by a first target display. The method may include generating, based on the plurality of color values and the one or more measured color values, a second-order or higher response-surface regression model that maps color values corresponding to a second color space to color values corresponding to a first color space. The method may include generating predicted color values for a specified white point by inputting a plurality of specified color values corresponding to the specified white point into the second-order or higher response-surface regression model, where each predicted color value may correspond to the first color space and each of the specified color values may correspond to the second color space.

Abstract: Some implementations provide automatic display mode selection for a device, such as a mobile display device, according to a hierarchy of criteria. Each display mode may correspond with a set of display parameter settings, which may include a color depth setting, a brightness setting, etc. In some examples, one of the criteria may correspond with a software application being executed on the device. Some implementations involve creating a display device user profile and controlling a display of a mobile display device according to the user profile. The user profile may be built gradually over some number of days/weeks/months after the first use of the device. In some implementations, display parameter setting information or other device setting information corresponding to data in a user profile, including but not limited to demographic data, may be received by a mobile display device from another device, such as a server.

Abstract: Some implementations provide automatic display mode selection for a device, such as a mobile display device, according to a hierarchy of criteria. Each display mode may correspond with a set of display parameter settings, which may include a color depth setting, a brightness setting, etc. In some examples, one of the criteria may correspond with a software application being executed on the device. Some implementations involve creating a display device user profile and controlling a display of a mobile display device according to the user profile. The user profile may be built gradually over some number of days/weeks/months after the first use of the device. In some implementations, display parameter setting information or other device setting information corresponding to data in a user profile, including but not limited to demographic data, may be received by a mobile display device from another device, such as a server.

Abstract: This disclosure describes techniques for calibrating and adjusting the white point of a display. The techniques for calibrating and adjusting the white point of a display may receive data indicative of a target color temperature for a white point of a display, and provide one or more user interface components that allow a user to select between multiple different candidate white points where each of the of the candidate white points has a correlated color temperature that corresponds to the target color temperature Different target white points for a display may exhibit different levels of luminance loss and/or tint. The techniques for calibrating and adjusting the white point of a display may allow a user to evaluate the trade-off between the luminance loss characteristics and/or tint characteristics of different white points.

Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for selecting an operational mode of a reflective display device from a plurality of operational modes that include at least one field-sequential color mode. The operational mode may be selected based, at least in part, on ambient light data. The ambient light data may include ambient light intensity data, ambient light spectrum data and/or ambient light direction data. The operational mode may be selected based, at least in part, on other criteria, such as display application type and/or battery state data.

Abstract: This disclosure provides methods, apparatus, and computer programs encoded on computer storage media for tone based halftoning of digital images. By exploiting knowledge of local image features and tone levels, the halftoning method may be adaptively switched between error-diffusion and mask-based dithering with reduced boundary artifacts. By further utilizing a smart quantization error clipping scheme, artifacts inherent to the method of error diffusion are also reduced. The method consistently generates higher quality halftone images for both still and video applications when compared to conventional methods.

Abstract: This disclosure provides techniques related to halftoning video images for display on an electronic device. The techniques include adaptively selecting, on a pixel-by-pixel basis, between a mask-based dithering (MBD) and an error diffusion (ED) halftoning technique. The ED technique may be selected for halftoning pixels of an input frame of data having either a temporal change rate metric (CRM) or a spatial CRM exceeding a respective threshold. Where both the temporal CRM and spatial CRM are less than the respective thresholds, halftoning may be performed by the technique that produces a halftone value closer to a comparison halftone value of a comparison frame. The comparison frame may be a preceding frame, or an immediately preceding frame.

Abstract: This disclosure provides implementations of dither-aware image coding processes, devices, apparatus, and systems. In one aspect, a portion of received image data is selected. First spatial domain values in the selected portion of the image data are transformed to first transform domain coefficients. Second spatial domain values in a designated dither matrix are transformed to second transform domain coefficients. A ratio of each of the first transform domain coefficients to a respective second transform domain coefficient is determined. The first transform domain coefficients are selectively coded in accordance with the determined ratios to define coded first transform domain coefficients. A reverse transformation is performed to transform the coded first transform domain coefficients to third spatial domain values defining a coded portion of the image data. By way of example, transformations such as discreet cosine transforms or discreet wavelet transforms can be used.

Abstract: This disclosure provides systems, methods and apparatus including computer programs encoded on computer storage media for producing line multiplied images with better visual appearance. In one aspect, before lines of the image are multiplied, they are dithered with a noise signal that increases faster with higher frequency along the multiplied dimension of the image data than along the non multiplied dimension of the image. This results in a line multiplied image was improved image quality.

Abstract: Systems, methods and apparatus including computer programs encoded on computer storage media optimize display image quality under a variety of imaging environments. Dynamic frame streams such as those present in video applications may require a higher frame rate to adequately convey motion in the stream. A line multiplying image pipeline may be utilized for dynamic frames, which lowers the resolution of the displayed image. When dithering line multiplied images, a noise signal including asymmetrical high frequency components around zero frequency may be utilized. The display of static frames, such as photographs, may be achieved with acceptable image quality using a relatively lower display frame rate. Such a frame rate may enable the display of a high resolution image. A noise signal tailored for higher resolution, non line multiplied frames, such as a noise signal with symmetric high frequency components around zero frequency may be utilized for static frames.

Abstract: Displays, and methods of displaying images with the displays, which have quantized display characteristics for each of the pixels are disclosed. The displays and methods relate to both spatially and temporally dithering images so that the effective resolution of the display is higher than the result of the native spatial and intensity resolutions of the display, defined by pixel size, pitch, and number of quantization levels of each of the pixels.

Abstract: A display device including a plurality of optical modulators and a plurality of filter elements on a reflective side of the plurality of optical modulators is provided. The plurality of optical modulators includes a first set of optical modulators and a second set of optical modulators. Each optical modulator of the plurality of optical modulators is configured to be selectively switched among at least a first state, a second state, and a third state. Each state has a different spectral reflectance. The plurality of filter elements includes a first set of filter elements corresponding to the first set of optical modulators and a second set of filter elements corresponding to the second set of optical modulators. The first set of filter elements has a different spectral transmittance than the second set of filter elements.

Abstract: A display device including a plurality of optical modulators and a plurality of filter elements on a reflective side of the plurality of optical modulators is provided. The plurality of optical modulators includes a first set of optical modulators and a second set of optical modulators. Each optical modulator of the plurality of optical modulators is configured to be selectively switched among at least a first state, a second state, and a third state. Each state has a different spectral reflectance. The plurality of filter elements includes a first set of filter elements corresponding to the first set of optical modulators and a second set of filter elements corresponding to the second set of optical modulators. The first set of filter elements has a different spectral transmittance than the second set of filter elements.

Abstract: A display device including a plurality of optical modulators and a plurality of filter elements on a reflective side of the plurality of optical modulators is provided. The plurality of optical modulators includes a first set of optical modulators and a second set of optical modulators. Each optical modulator of the plurality of optical modulators is configured to be selectively switched among at least a first state, a second state, and a third state. Each state has a different spectral reflectance. The plurality of filter elements includes a first set of filter elements corresponding to the first set of optical modulators and a second set of filter elements corresponding to the second set of optical modulators. The first set of filter elements has a different spectral transmittance than the second set of filter elements.