Seiko Epson Corporation

Jerzy Wieslaw Swic

Jiliang Song

Joseph S Shu

Eric Jeffrey

Tsung-Nan Lin

John Peter Van Baarsen

Atousa Soroushi

A method for enhancing a color image may include selecting a set of operations from a group of operations, specifying an order for performing the selected set of operations, receiving the color image, and performing, with a processor, the selected set of operations in the specified order on the color image. The group of operations may include a color correcting operation, an image filtering operation, a color linearization operation, a saturation adjustment operation, a luma scaling operation, and an image dithering operation. The method may include determining an optical property of an ambient light source or an image type of the color image. The selecting of the set of operations may be based at least in part on the determined optical property of the ambient light source or on the determined image type. The method may include an efficient method for correcting image saturation of a color image.

Enhancing color images

An electro-optic display device includes a display matrix of display pixels. Each display pixel may include two or more first sub-pixels and a second sub-pixel. Each first sub-pixel may have two or more display states and a color filter. The second sub-pixel may have two or more display states and a white filter. The first sub-pixels may be arranged in rows and columns in a repeating pattern, and each first sub-pixel may be horizontally adjacent and vertically adjacent to one or more second sub-pixels. In addition, a display controller may include a data switch, a color correction module, an image filtering module, a color linearization module, an image dithering module, and a saturation adjustment module. The modules may be configured to perform operations at first and second pixel resolutions.

Arranging and processing color sub-pixels

Data is written to one of two frame buffers in write access cycles having write and non-write sub-periods. Data is read out to a display device from the other of the two frame buffers in read access cycles having read and non-read sub-periods. The writing of data and the reading of data are switched to a respective opposite frame buffer during a switching opportunity, a switching opportunity occurring when a read access cycle is in a non-read sub-period and a write access cycle is in a non-write sub-period. A count of the number of times a switching opportunity is not executed because a read access cycle is in a non-read sub-period while a write access cycle is in a write sub-period is incremented. If the count exceeds a particular threshold, a write access cycle subsequent to the count exceeding the threshold is masked. When a write access cycle is a masked data is not written into a buffer.

Double-buffering of video data

The invention is directed, in one embodiment, to a method for generating memory addresses for accessing an image in which each pixel in a group of pixels has a luma component, but shares chroma components with other pixels of the group. A preferred method includes providing a memory, having a plurality of first portions and a plurality of second portions. First memory addresses may be generated, each of which corresponds to one of the first portions. Each first address defines a storage location for the luma components of one of the pixel groups. Second memory addresses may be generated, each of which corresponds to one of the second portions. Each second address defines a storage location for the chroma components of at least one of the pixel groups.

Methods and apparatus for efficiently accessing reduced color-resolution image data

In one embodiment, an image is created by combining an overlay image with a main image. Each pixel of the main and overlay images is defined by a luma component and at least one color component. Each luma component takes a value within a luma range, the lowest and highest values in the luma range being, respectively, a minimum and maximum value. For each pixel in the overlay image, it is determined that the pixel is: an opaque pixel, a transparent pixel, or an intermediate pixel. Each pixel of the main image that is in a location that corresponds to the location of an opaque pixel is replaced with the corresponding opaque pixel. In one embodiment, each pixel of the main image that is in a location that corresponds to the location of a transparent pixel is retained. Further, the luma component of each pixel of the main image that is in a location that corresponds to the location of an intermediate pixel is, in one embodiment, replaced with a luma value that is equivalent to the two's complement of the luma value of the corresponding intermediate pixel.

Method and apparatus for overlaying reduced color resolution images

The gray shade rendering capability of a display device having a frame rate of q frames per display cycle is enhanced by comparing an intensity value representing a gray shade of a current pixel with a respective dither matrix threshold value and providing a pixel on/off signal, storing a plurality of quantization values ranging from 1 to q in a quantization table, outputting p quantization values from the quantization table as active quantization values in accordance with a quantized pixel value p, shifting the quantization values in the table in response to a frame signal, comparing a quantized dither matrix threshold value to the active quantization values and producing an active quantized threshold signal, producing a pixel out signal in response to the pixel on/off signal and the active quantized threshold signal, and in response to the pixel out signal displaying the current pixel with an average gray value of p/q through a display period of q frames.

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Vancouver, Canada

Jerzy Wieslaw Swic