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    • 1. 发明申请
    • TEXTURE COMPRESSION AND DECOMPRESSION
    • 纹理压缩和分解
    • WO2011126424A1
    • 2011-10-13
    • PCT/SE2011/050145
    • 2011-02-09
    • TELEFONAKTIEBOLAGET L M ERICSSON (publ)RASMUSSON, JimDOGGETT, MichaelSTRÖM, JacobWENNERSTEN, Per
    • RASMUSSON, JimDOGGETT, MichaelSTRÖM, JacobWENNERSTEN, Per
    • G06T9/00H04N7/26
    • G06T9/00
    • Embodiments relate to compression and decompression of textures. A texel block (10) is compressed by specifying two major directions in the texel block (10) and defining the profiles of how the texel values change along the respective directions. The resulting compressed texel block (30) comprises two value codewords (31, 32), two line codewords (35-38) and a function codeword (33, 34). The two value codewords (31, 32) are employed to calculate two texel values for the texel block (10). The line codewords (35-38) are employed to determine equations of two lines (20, 22) coinciding with the two major directions in the texel block (10). Signed distances are calculated for each texel (12) from the texel position in the texel block (10) and to the two lines (20, 22). The signed distances are input to a function defined by the function codeword (33, 34) to output two values from which weights are calculated and applied to the two texel values in order to get a representation of the texel value of a texel (12).
    • 实施例涉及纹理的压缩和解压缩。 通过在纹素块(10)中指定两个主要方向来压缩纹理块(10),并且定义纹理值沿着各个方向如何变化的轮廓。 所得到的压缩纹理块(30)包括两个值码字(31,32),两行码字(35-38)和一个功能码字(33,34)。 两个值码字(31,32)用于计算纹素块(10)的两个纹素值。 行码字(35-38)用于确定与纹理块(10)中的两个主要方向一致的两条线(20,22)的等式。 从纹理块(10)中的纹素位置和两条线(20,22)中的每个纹理像素(12)计算签名距离。 有符号距离被输入到由功能代码字(33,34)定义的函数,以输出计算权重的两个值并将其应用于两个纹素值,以便获得纹素的纹理值的表示(12) 。
    • 3. 发明申请
    • APPARATUS AND METHOD FOR ADAPTIVELY PRECOMPENSATING FOR LOUDSPEAKER DISTORTIONS
    • 用于适应扬声器失真的适应性预处理的装置和方法
    • WO1996026624A1
    • 1996-08-29
    • PCT/US1996002039
    • 1996-02-20
    • ERICSSON INC.DENT, Paul, WilkinsonRASMUSSON, Jim, Agne, JerherJOHNSEN, Ronald, J.
    • ERICSSON INC.
    • H04R03/00
    • H04R3/002
    • In an audio system, a loudspeaker responds to an input signal producing a sound pressure wave having a linear component, which is linear function of the input signal, and an undesired non-linear component, which is a non-linear function of the input signal. Accordingly, it is desirable to reduce the non-linear component of the output sound pressure wave. An adaptive precompensating audio system for reducing this non-linear component includes a loudspeaker for producing a sound pressure wave and a precompensating filter for precompensating an input signal representative of the desired sound pressure wave. In addition, a microphone may be used to convert the resulting sound pressure wave into a sound signal and a precompensating filter modifier may be used to modify the precompensating filter in response to the sound signal. Preferably, the precompensating filter transforms the input signal using an inverse of an estimated transfer function for the loudspeaker.
    • 在音频系统中,扬声器响应于产生具有作为输入信号的线性函数的线性分量的声压波的输入信号和作为输入信号的非线性函数的非期望的非线性分量 。 因此,期望降低输出声压波的非线性分量。 用于减小该非线性分量的自适应预补偿音频系统包括用于产生声压波的扬声器和用于预补偿表示期望声压波的输入信号的预补偿滤波器。 此外,可以使用麦克风将所得到的声压波转换成声音信号,并且可以使用预补偿滤波器修改器来响应于声音信号来修改预补偿滤波器。 优选地,预补偿滤波器使用用于扬声器的估计传递函数的倒数变换输入信号。
    • 4. 发明申请
    • ECHO CANCELLER USING A CENTER CLIPPER WITH THRESHOLD SET ACCORDING TO ESTIMATED ECHO
    • ECHO CANCELLER使用带有阈值的中心剪辑器根据估算的ECHO
    • WO1995019085A1
    • 1995-07-13
    • PCT/US1995000228
    • 1995-01-03
    • ERICSSON INC.RASMUSSON, Jim, A., J.
    • ERICSSON INC.
    • H04M09/08
    • H04M9/082
    • An echo-cancelling system and method uses an echo estimate (714) to modify the error signal (716) which is obtained by the difference between an echo signal (706) and the echo estimate (714). The modified error signal (718), rather than the error signal itself, is transmitted. By using the echo estimate (714) as a parameter for modifying the error signal (716), improved hands-free performance may be obtained in a vehicular radiotelephone, such as a cellular telephone. Preferably, modification of the electrical error signal is performed by a center clipper (720) which removes a portion of the electrical error signal which is below a variable threshold, wherein the variable threshold is determined by the echo estimate electrical signal. The variable threshold may be produced from the echo estimate electrical signal using an envelope detector (710).
    • 回波消除系统和方法使用回波估计(714)来修改由回波信号(706)和回波估计(714)之间的差异获得的误差信号(716)。 发送修正误差信号(718)而不是误差信号本身。 通过使用回波估计(714)作为用于修改误差信号(716)的参数,可以在诸如蜂窝电话的车载无线电话机中获得改进的免提性能。 优选地,通过去除低于可变阈值的电差错信号的一部分的中心限幅器(720)执行电差错信号的修改,其中可变阈值由回波估计电信号确定。 可以使用包络检测器(710)从回波估计电信号产生可变阈值。
    • 6. 发明申请
    • FRAME BUFFER COMPRESSION AND DECOMPRESSION METHOD FOR GRAPHICS RENDERING
    • 用于图形渲染的框架缓冲器压缩和解压缩方法
    • WO2008122536A3
    • 2009-01-08
    • PCT/EP2008053810
    • 2008-03-31
    • ERICSSON TELEFON AB L MRASMUSSON JIMAKENINE-MOELLER TOMASHASSELGREN JONMUNKBERG JACOB
    • RASMUSSON JIMAKENINE-MOELLER TOMASHASSELGREN JONMUNKBERG JACOB
    • H04N7/26
    • G06T11/40G09G5/363G09G5/393G09G2340/02G09G2340/10H04N19/12H04N19/147H04N19/154H04N19/176H04N19/40H04N19/423
    • Methods and apparatus are disclosed for the processing of frame buffer data, such as color buffer data, in graphics processing applications. Although more generally applicable, these methods and apparatus are particularly useful in real-time, polygon-based, 3D rendering applications. An exemplary method for processing graphics data according to one or more embodiments of the invention begins with the retrieval, from a buffer, of pixel values corresponding to a tile of two or more pixels, and with the updating of one or more of those updated pixel values. The updated pixel values are selectively compressed using a lossy compression operation or a lossless compression operation, based on an accumulated error metric value for the tile. If lossy compression is used, then the accumulated error metric value for the tile is updated; in either event, the compressed pixel values are stored in the frame buffer for further processing. With this approach, the accumulated error caused by successive, or tandem, compression operations may be limited to a pre-determined maximum.
    • 公开了用于在图形处理应用中处理帧缓冲器数据(例如彩色缓冲器数据)的方法和装置。 尽管更普遍适用,但是这些方法和装置在实时,基于多边形的3D渲染应用中特别有用。 根据本发明的一个或多个实施例的用于处理图形数据的示例性方法开始于从缓冲器检索对应于两个或更多个像素的图块的像素值,并且随着更新这些更新像素中的一个或多个 值。 基于瓦片的累积误差度量值,使用有损压缩操作或无损压缩操作来选择性地压缩更新的像素值。 如果使用有损压缩,则更新瓦片的累积误差量度值; 在任一情况下,将压缩像素值存储在帧缓冲器中用于进一步处理。 利用这种方法,由连续或串联的压缩操作引起的累积误差可能被限制为预定的最大值。
    • 7. 发明申请
    • FRAME BUFFER COMPRESSION AND DECOMPRESSION METHOD FOR GRAPHICS RENDERING
    • 用于图形渲染的框架缓冲器压缩和解压缩方法
    • WO2008122536A2
    • 2008-10-16
    • PCT/EP2008/053810
    • 2008-03-31
    • TELEFONAKTIEBOLAGET LM ERICSSON (publ)RASMUSSON, JimAKENINE-MÖLLER, TomasHASSELGREN, JonMUNKBERG, Jacob
    • RASMUSSON, JimAKENINE-MÖLLER, TomasHASSELGREN, JonMUNKBERG, Jacob
    • G06T11/40G09G5/363G09G5/393G09G2340/02G09G2340/10H04N19/12H04N19/147H04N19/154H04N19/176H04N19/40H04N19/423
    • Methods and apparatus are disclosed for the processing of frame buffer data, such as color buffer data, in graphics processing applications. Although more generally applicable, these methods and apparatus are particularly useful in real-time, polygon-based, 3D rendering applications. An exemplary method for processing graphics data according to one or more embodiments of the invention begins with the retrieval, from a buffer, of pixel values corresponding to a tile of two or more pixels, and with the updating of one or more of those updated pixel values. The updated pixel values are selectively compressed using a lossy compression operation or a lossless compression operation, based on an accumulated error metric value for the tile. If lossy compression is used, then the accumulated error metric value for the tile is updated; in either event, the compressed pixel values are stored in the frame buffer for further processing. With this approach, the accumulated error caused by successive, or tandem, compression operations may be limited to a pre-determined maximum.
    • 公开了用于在图形处理应用中处理帧缓冲器数据(例如彩色缓冲器数据)的方法和装置。 尽管更普遍适用,但是这些方法和装置在实时,基于多边形的3D渲染应用中特别有用。 根据本发明的一个或多个实施例的用于处理图形数据的示例性方法开始于从缓冲器检索对应于两个或更多个像素的图块的像素值,并且随着更新这些更新像素中的一个或多个 值。 基于瓦片的累积误差度量值,使用有损压缩操作或无损压缩操作来选择性地压缩更新的像素值。 如果使用有损压缩,则更新瓦片的累积误差量度值; 在任一情况下,将压缩像素值存储在帧缓冲器中用于进一步处理。 利用这种方法,由连续或串联的压缩操作引起的累积误差可能被限制为预定的最大值。
    • 8. 发明申请
    • METHOD AND DEVICE FOR DEMOSAICING OF COLOR IMAGES
    • 用于彩色图像的去混合的方法和设备
    • WO2017125162A1
    • 2017-07-27
    • PCT/EP2016/051270
    • 2016-01-21
    • SONY MOBILE COMMUNICATIONS INC.RASMUSSON, Jim
    • RASMUSSON, JimPETTERSSON, StefanGRAHN, Håkan
    • G06T3/40
    • G06T3/4015
    • Techniques for demosaicing of digital color images are improved by estimating and using the structural instability in the neighborhood of the respective pixel. The structural instability for a color is given by the range of the color values for this color in a first local region around each current pixel. A method is executed by a device for interpolating a missing color at the current pixel in a color image produced by a digital image sensor having a color filter array, the current pixel having a current color that differs from the missing color. The method comprises: computing (51) a range value for one of: pixels having the missing color and pixels having the current color; computing (52) an interpolation value at the current pixel as a function of the range value and color values for pixels having the missing color within a second local region around the current pixel; and setting the missing color at the current pixel to the interpolation value.
    • 通过估计和使用相应像素附近的结构不稳定性来改善数字彩色图像去马赛克的技术。 颜色的结构不稳定性由每个当前像素周围的第一局部区域中该颜色的颜色值的范围给出。 一种方法由用于在由具有滤色器阵列的数字图像传感器产生的彩色图像中的当前像素处插值缺失颜色的设备执行,该当前像素具有与缺失颜色不同的当前颜色。 该方法包括:计算(51)具有缺失颜色的像素和具有当前颜色的像素之一的范围值; 根据当前像素周围的第二局部区域内的具有缺失颜色的像素的范围值和颜色值来计算(52)当前像素处的插值值; 并将当前像素处的缺失颜色设置为插值。