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    • 2. 发明授权
    • Graphic system with read/write overlap detector
    • 具有读/写重叠检测器的图形系统
    • US5870109A
    • 1999-02-09
    • US870482
    • 1997-06-06
    • Joel J. McCormackChristopher C. GianosAndrew V. HoarLarry D. SeilerNorman P. JouppiJames T. Claffey
    • Joel J. McCormackChristopher C. GianosAndrew V. HoarLarry D. SeilerNorman P. JouppiJames T. Claffey
    • G09G5/377G06T7/00G09G5/39G09G5/393G09G5/36
    • G09G5/393
    • A graphics system for storing and editing graphic images represented by digital data, includes a frame memory for storing pixel data representing graphic images including first and second graphic objects. The pixel data is stored at addresses, each being associated with one or more graphic fragment forming the first and second graphic objects. First and second addresses are respectively associated with those of the graphic fragments forming the first and second graphic objects. A memory controller controls writing and reading the pixel data to and from the frame memory. A fragment editor is provided to receive the pixel data read from the first address and modify the associated fragment with the received pixel data so as to form modified pixel data. An address detector detects the first address responsive to a request to read the pixel data from the first address and the second address responsive to a subsequent request to read pixel data from the second address. The detector compares the detected first and second addresses to identify an overlap of the first and second graphic objects. If an overlap is identified, the controller controls the writing of the modified pixel data to the first address before the reading of the pixel data from the second address.
    • 用于存储和编辑由数字数据表示的图形图像的图形系统包括用于存储表示包括第一和第二图形对象的图形图像的像素数据的帧存储器。 像素数据存储在地址处,每个地址与形成第一和第二图形对象的一个​​或多个图形片段相关联。 第一和第二地址分别与形成第一和第二图形对象的图形片段的相关联。 存储器控制器控制向帧存储器写入和读取像素数据。 提供片段编辑器以接收从第一地址读取的像素数据,并修改与接收到的像素数据相关联的片段,以便形成修改后的像素数据。 地址检测器响应于从第一地址读取像素数据的请求并响应于从第二地址读取像素数据的后续请求而检测第一地址。 检测器将检测到的第一和第二地址进行比较以识别第一和第二图形对象的重叠。 如果识别出重叠,则在从第二地址读取像素数据之前,控制器控制将修改的像素数据写入第一地址。
    • 3. 发明授权
    • Pre-filtered antialiased lines using distance functions
    • 使用距离函数的预滤波抗锯齿线
    • US06329977B1
    • 2001-12-11
    • US09037412
    • 1998-03-10
    • Robert S. McNamaraJoel J. McCormackNorman P. JouppiJames T. ClaffeyJames M. KnittelLarry D. Seiler
    • Robert S. McNamaraJoel J. McCormackNorman P. JouppiJames T. ClaffeyJames M. KnittelLarry D. Seiler
    • G09G510
    • G09G5/20G06T11/203
    • A computer graphics system renders an image on a display device using improved pre-filtering techniques that minimize aliasing artifacts in the image, particularly at the endpoints of lines. To anti-alias the image, a plurality of edges are placed near a line in the image. An edge function represents the edge. This edge function is multiplied by a scale factor to produce a distance function. This scale factor is the reciprocal of the Euclidean length of the line. The distance function is evaluated to determine the distance of selected pixels from each edge in units of pixels. These distances determine the intensity value for each selected pixel. Pixels on or beyond an edge, with respect to the line, are given a minimum intensity value; pixels inside all edges are given intensity values corresponding to their distances from the edge. An intensity function describing a relationship between pixel distances from the edges and their corresponding intensity values is developed. The intensity function can be implemented in a look-up table or approximated with hardware.
    • 计算机图形系统使用改进的预滤波技术在显示设备上呈现图像,该技术最小化图像中的混叠伪像,特别是在线的端点处。 为了使图像反锯齿,多个边缘放置在图像中的一行附近。 边缘函数表示边缘。 该边缘函数乘以比例因子以产生距离函数。 该比例因子是线的欧几里德长度的倒数。 评估距离函数以确定每个边缘中所选像素的距离(以像素为单位)。 这些距离决定了每个所选像素的强度值。 相对于线,边缘以上的像素被赋予最小强度值; 所有边缘内的像素都具有与其距离边缘的距离对应的强度值。 开发描述从边缘的像素距离与其对应的强度值之间的关系的强度函数。 强度函数可以在查找表中实现或用硬件近似。
    • 6. 发明授权
    • Techniques for anisotropic texture mapping using multiple space-invariant filtering operations per pixel
    • 使用每像素多次空间不变滤波操作的各向异性纹理映射技术
    • US06292193B1
    • 2001-09-18
    • US09126567
    • 1998-07-30
    • Ronald PerryNorman P. JouppiJoel J. McCormackKeith Istvan Farkas
    • Ronald PerryNorman P. JouppiJoel J. McCormackKeith Istvan Farkas
    • G06T1140
    • G06T15/04
    • A computer graphics system maps textures to displayed anti-aliased images with surfaces defined at oblique angles to the viewer. A circular pixel filter is projected onto a texture map to define an elliptical footprint in that texture map. The elliptical footprint has a major axis. Sample points are determined on a line in the footprint that closely approximates the major axis. These sample points are mapped to levels of detail and locations within a mip-map. Using a space-invariant filter, a texture value is computed for each sample point using data from one or more texture maps within the mip-map. These texture values for the sample points are post-filtered using a Gaussian filter function and summed to produce a final texture value. Blending the final texture with other characteristics of the pixel a produces the pixel data that are displayed on a display screen.
    • 计算机图形系统将纹理映射到显示的抗锯齿图像,其中以与观看者倾斜的角度定义的表面。 将圆形像素滤波器投影到纹理贴图上以在该纹理贴图中定义椭圆形足迹。 椭圆形足迹具有长轴。 采样点在紧邻主轴的足迹线上确定。 这些采样点被映射到mip-map中的细节级别和位置。 使用空间不变滤波器,使用来自mip-map内的一个或多个纹理图的数据,为每个采样点计算纹理值。 样本点的这些纹理值使用高斯滤波函数进行后置滤波,并求和以产生最终纹理值。 将最终纹理与像素a的其他特征混合产生显示在显示屏上的像素数据。
    • 7. 发明授权
    • Method and apparatus for compositing colors of images with memory constraints for storing pixel data
    • 用于将图像的颜色与用于存储像素数据的存储器约束进行合成的方法和装置
    • US06204859B1
    • 2001-03-20
    • US08950557
    • 1997-10-15
    • Norman P. JouppiJoel J. McCormackChun-Fa Chang
    • Norman P. JouppiJoel J. McCormackChun-Fa Chang
    • G06T1140
    • G06T11/001
    • A method and an apparatus determine a color for pixels in a graphics system in which images are defined by pixels. Multiple fragments of an image may be visible in any given pixel. Each visible fragment has a fragment value that includes the color of that fragment. For such given pixel, up to a predetermined number of the fragment values are stored. When a new fragment is visible in the given pixel, one of the fragment values is discarded to determine which fragment values are stored and subsequently used to generate the color of the pixel. The discarded fragment value may be the new fragment value or one of the stored fragment values. Various strategies can be used to determine which fragment value is discarded. One such scheme selects the stored fragment value with the greatest Z-depth. Another scheme selects the stored fragment value that produces the smallest color difference from the new fragment value. Still another scheme selects the new fragment value when one of the fragments is in front of the new fragment and the stored fragment value of that fragment produces the smallest color difference from the new fragment value.
    • 方法和装置确定图像系统中的像素的颜色,其中图像由像素定义。 图像的多个片段可能在任何给定像素中可见。 每个可见片段都具有包含该片段颜色的片段值。 对于这样的给定像素,直到预定数量的片段值被存储。 当在给定像素中可见新的片段时,丢弃其中一个片段值,以确定哪些片段值被存储并随后用于生成像素的颜色。 丢弃的片段值可以是新的片段值或存储的片段值之一。 可以使用各种策略来确定哪个片段值被丢弃。 一种这样的方案选择具有最大Z深度的存储的片段值。 另一种方案从新片段值中选择产生最小色差的存储片段值。 当其中一个片段位于新片段前面时,另一个方案选择新片段值,并且该片段的存储片段值产生与新片段值最小的色差。