Abstract: A video display system is disclosed. The video display system comprises a display generator for providing a display timing signal and a frame rate converter for receiving input video data, input video timing, and for providing output video data. The system includes a control logic for receiving a frame rate indication signal, the video input timing and the display timing signal. The control logic changes the display frame rate of the display generator in accordance with the native frame rate of the program, and in such a way as to maintain a stable image throughout.

Abstract: A system for enhancing brightness and resolution while correcting certain types of convergence, geometry, color and luminance errors caused by the display device, the viewing position or both. This system involves merging images from two or more sources, overlapping and offsetting pixels, or overlapping scanning lines ‘merged raster’ in a CRT or several (3) ‘merged rasters’ in color CRTs, and adjusting video content and timing, to compensate for the current viewing position and/or device distortion. Display and/or viewing perspective distortion characteristics are measured from the observers viewing position for the raster or each non-converged raster and stored as correction factor data in non-volatile memory. This data is used to modify the digital addressing of video image memory, to read and to correct pixel data for each image, adjust color, modify magnitude, and to drive the displays video amplifier at the correct time with the corrected amplitude and image data.

Abstract: Reducing fast motion artifacts in an LCD panel by receiving a video stream at a first frame rate which is then downsampled to a second frame rate. The downsampled video stream is then upsampled to a third frame rate and a voltage is applied to a pixel element such that the pixel element transitions from a first pixel value to a predetermined second pixel value within a period of time consistent with the third frame rate.

Abstract: A method for reducing a response time of the pixels corresponding to a period of time required for a selected pixel at a starting pixel value to reach a target pixel value. Providing an n×n LCD overdrive matrix and for a selected pixel at a particular start pixel value, selecting a particular target pixel value to be reached in one frame time, and determining a particular overdrive pixel value based upon the particular start pixel value and the particular target pixel value using triangular interpolation.

Abstract: To achieve the foregoing, and in accordance with the purpose of the present invention, an apparatus and method for generating refined sub-pixel vectors for motion estimation from vector correlation values and converged vector correlation values using quadratic approximations respectively is disclosed. The apparatus and method includes defining a minimum vector position value of a converged vector and then determining a predetermined number of vector correlation samples around the minimum vector position value. The predetermined number of vector correlation samples provide a coarse correlation surface estimation of the minimum vector position value. A correlation surface fitting of the predetermined number of vector correlation samples using a quadratic approximation of the coarse correlation surface estimation of the minimum value is then performed. The correlation surface fitting resulting in a refined sub-pixel minimum vector position with horizontal and vertical components.

Abstract: A method of auto-calibration of a liquid crystal display (LCD) is described. The method is carried out by generating and displaying on the LCD a test patch at a first grey level, generating a first signal based upon the test pattern at the first grey level, generating and displaying a second test patch at a second grey level, generating a second signal based upon the test pattern at the second grey level, and calculating an entry to an LCD overdrive table based upon the first and the second signal.

Abstract: A video display system is disclosed. The video display system comprises a display generator for providing a display timing signal and a frame rate converter for receiving input video data, input video timing, and for providing output video data. The system includes a control logic for receiving a frame rate indication signal, the video input timing and the display timing signal. The control logic changes the display frame rate of the display generator in accordance with the native frame rate of the program, and in such a way as to maintain a stable image throughout.

Abstract: A system and method for generating an interpolated pixel at a vertical position in a field of a video frame. The method comprises the steps of receiving at least two pixels vertically adjacent the vertical position in the field and at least three pixels from at least one adjacent field, detecting a degree of motion in the vicinity of the interpolated pixel, providing weighting factors based on the degree of motion, and calculating the interpolated pixel based on a combination of weighted contributions from the at least two pixels and the at least three pixels. The weighted contributions are derived from a combination of the weighting factors and at least vertical-temporal and temporal interpolation.

Abstract: A method for generating from an input signal with a predetermined input spatial resolution a high contrast rescaled image having a predetermined output spatial resolution which differs from the input spatial resolution, comprising the steps of generating output samples from input samples of the input signal, detecting predetermined ones of the output samples which occur in excess of a predetermined time threshold from nearest occurring ones of said input samples detecting image details in the input signal at the nearest occurring ones of the input samples, and shifting the predetermined ones of the output samples so as to substantially align with the image details and thereby enhance image contrast of the details.

Abstract: A system for enhancing brightness and resolution while correcting certain types of convergence, geometry, color and luminance errors caused by the display device, the viewing position or both. This system involves merging images from two or more sources, overlapping and offsetting pixels, or overlapping scanning lines “merged raster” in a CRT or several (3) “merged rasters” in color CRT's, and adjusting video content and timing, to compensate for the current viewing position and/or device distortion. Display and/or viewing perspective distortion characteristics are measured from the observers viewing position for the raster or each non-converged raster and stored as correction factor data in non-volatile memory. This data is used to modify the digital addressing of video image memory, to read and to correct pixel data for each image, adjust color, modify magnitude, and to drive the displays video amplifier at the correct time with the corrected amplitude and image data.

Abstract: A method for measuring motion at a horizontal and vertical position between video fields of opposite parity comprising the steps of measuring the signal values of at least two vertically adjacent pixels from a video field of one parity and at least two vertically adjacent pixels from a video field of the opposite parity such that when taken together, the pixels represent contiguous samples of an image at said horizontal and vertical position, and determining whether the signal value of any of the pixels lies between the signal values of adjacent pixels in the field of opposite parity and in response outputting a zero motion value, otherwise, outputting a motion value equal to the lowest absolute difference between any of the pixels and its closest adjacent pixel in the field of opposite parity.

Abstract: A method and apparatus for reducing the appearance of moiré in a digitally resized image wherein each input pixel value is mapped to a new value by means of a first correction function prior to being resized. At the output of the resizing engine, each pixel in the resized image is mapped to a further new value by means of a second correction function prior to being displayed. The second correction function is chosen such that the intensity of light output from the display device is substantially proportional to the value of the signal from the resizing engine, taking into account the combined transfer functions of the second correction means and the physical display device (i.e. the second correction function is substantially the inverse of the display transfer characteristic).

Abstract: A system and method for generating an interpolated pixel at a vertical position in a field of a video frame. The method comprises the steps of receiving at least two pixels vertically adjacent the vertical position in the field and at least three pixels from at least one adjacent field, detecting a degree of motion in the vicinity of the interpolated pixel, providing weighting factors based on the degree of motion, and calculating the interpolated pixel based on a combination of weighted contributions from the at least two pixels and the at least three pixels. The weighted contributions are derived from a combination of the weighting factors and at least vertical-temporal and temporal interpolation.

Abstract: A method for measuring motion at a horizontal and vertical position between video fields of opposite parity comprising the steps of measuring the signal values of at least two vertically adjacent pixels from a video field of one parity and at least two vertically adjacent pixels from a video field of the opposite parity such that when taken together, the pixels represent contiguous samples of an image at said horizontal and vertical position, and determining whether the signal value of any of the pixels lies between the signal values of adjacent pixels in the field of opposite parity and in response outputting a zero motion value, otherwise, outputting a motion value equal to the lowest absolute difference between any of the pixels and its closest adjacent pixel in the field of opposite parity.

Abstract: A method of de-interlacing used to convert an interlaced video signal to a progressively scanned format utilizing vertical temporal filtering to generate the missing lines, utilizing appropriate filter coefficients to give a desired vertical frequency response, and filter utilizing coefficients such that the total combined contribution from all fields is unity while the total contribution from each individual field is chosen so as to boost higher temporal frequencies which has the perceived effect of increasing the sharpness of moving edges. Furthermore, in order to avoid certain unwanted artifacts, the lines of the current field are modified using a vertical temporal filter with similar temporal boosting properties to that which was used to generate the missing lines.