Seiko Epson Corporation

Atousa Soroushi

Victor Ga-Kui Chan

Doug McFadyen

Jerzy Wieslaw Swic

Patrick Wai-Tong Leung

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

A method and apparatus for high speed addressing of a memory space from a relatively small address space. An N-bit bus interfaces with a memory device having a 2address memory space, where M is greater than N. The method and apparatus provide for (a) providing at least two registers, (b) receiving one byte of a plurality of N-bit bytes that together define an address in the memory space, (c) incrementing a count as a result of completing step (b), (d) addressing one of the two registers according to the incremented count in step (c), and (e) storing the one byte in the register addressed in step (d).

Method and apparatus for high speed addressing of a memory space from a relatively small address space

In a method, a plurality of scale factors and a plurality of sets of pixel replication sequences are provided. A scale factor, a pixel replication sequence, a first pixel of an original image, and a scale offset parameter are selected. The selected first pixel is mapped into a first pixel location in an enlarged image. The selected scale factor and scale offset are added, producing a first sum. The first sum is compared to a maximum sum. If the first sum is less than the maximum sum, the selected first pixel is also mapped into a second pixel location. Otherwise, a second pixel is selected from the original image and mapped into the second pixel location.

Method and apparatus for expanding image data to create enlarged images for display

A memory efficient method and apparatus for displaying large overlaid camera images. According to one aspect of the invention, overlay image data are stored in a memory, fetched, up-scaled, and then combined with main image data to form composite image data for rendering on a graphics display device. According to another aspect of the invention, the overlay image data are stored in a memory, fetched, and then combined with main image data streamed from a source of the main image data.

Memory efficient method and apparatus for displaying large overlaid camera images

A power cut-off protection control circuit and method. A memory pair and a selecting circuit are provided. The memory pair stores data made available at respective storage inputs of first and second storage elements of the pair and provides the stored data at respective storage outputs thereof. The memory pair has a polarity selecting input through which the output of one of the first and second storage elements is caused to correspond to a first control state of the switch and the output of the other of the first and second storage elements is caused to correspond to a second control state of the switch. The selecting circuit has inputs coupled to the respective storage outputs of the memory pair and an output coupled to a control line of the switch for controlling the switch. A selecting line of the selecting circuit selects between the inputs, for selecting one or the other of the storage outputs of the first and second storage elements.

Circuit and method for controlling a power cut-off protection circuit

A system and method for continuously tracing transfer rectangles for performing image data transfers includes a display controller with control logic, a rectangle module, and a coordinates module. The rectangle module detects write operations to on-screen data in a video memory, and then updates a primary transfer rectangle during a normal mode to include pixel data from the foregoing write operations. The coordinates module stores the primary transfer rectangle for performing a current transfer operation. The coordinates module enters a pause mode before initiating the current transfer operation, and retains the primary transfer rectangle during the pause mode. The coordinate module also stores a secondary transfer rectangle formed during the pause mode by detecting the foregoing write operations. The controller logic instructs the coordinates module to resume the normal mode after the current transfer operation concludes. The coordinates module then replaces the primary transfer rectangle with the secondary transfer rectangle for performing a subsequent transfer operation.

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Vancouver, Canada

Atousa Soroushi