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    • 5. 发明授权
    • Low cost video compression using fast, modified Z-coding of wavelet pyramids
    • 低成本视频压缩使用快速,修改的Z编码的小波金字塔
    • US07634008B2
    • 2009-12-15
    • US11289862
    • 2005-11-29
    • William C. LynchKrasimir D. KolarovWilliam J. Arrighi
    • William C. LynchKrasimir D. KolarovWilliam J. Arrighi
    • H04N7/12H04N11/02
    • H03M7/4006H03M7/40H04N19/10H04N19/13H04N19/61H04N19/63H04N19/647H04N19/91
    • An entropy efficient video coder for wavelet pyramids approaches the entropy-limited coding rate of video wavelet pyramids, is fast in both hardware and software implementations, and has low complexity (no multiplies) for use in ASICs. It uses a modified Z-coder to code the zero/non-zero significance function and Huffman coding for the non-zero coefficients themselves. The encoding unit includes a significance function generator that receives coefficients and outputs a single significance bit. A zero coefficient eliminator receives coefficients in parallel with the significance function generator and outputs coefficients if non-zero. Output from the significance function generator is coded using the modified Z-coder. Output from the zero coefficient eliminator is coded using Huffman coding. Both outputs are combined to form the resulting compressed stream. The modified Z-coder is similar to a standard Z-coder but uses a different technique for the LPS (least probable symbol) case during encoding and decoding that results in a Z-coder that functions appropriately.
    • 用于小波金字塔的熵效率视频编码器接近视频小波锥体的熵受限编码率,在硬件和软件实现方面都很快,并且在ASIC中使用的复杂度较低(无乘法)。 它使用修改后的Z编码器来对非零系数本身进行零/非零重要性函数和霍夫曼编码。 编码单元包括接收系数并输出单个有效位的有效函数发生器。 零系数消除器接收与有效函数发生器并联的系数,如果非零,则输出系数。 来自有意义函数发生器的输出使用修改的Z编码器进行编码。 来自零系数消除器的输出使用霍夫曼编码进行编码。 两个输出被组合以形成产生的压缩流。 修改的Z编码器类似于标准Z编码器,但是在编码和解码期间对于LPS(最不可能的符号)情况使用不同的技术,导致Z编码器适当地起作用。
    • 8. 发明授权
    • Background estimation and segmentation based on range and color
    • 基于范围和颜色的背景估计和分割
    • US07317830B1
    • 2008-01-08
    • US10703393
    • 2003-11-07
    • Gaile GordonTrevor DarrellMichael HarvilleJohn Woodfill
    • Gaile GordonTrevor DarrellMichael HarvilleJohn Woodfill
    • G06K9/34
    • G06K9/38G06T7/11G06T7/143G06T7/174G06T7/194G06T2207/10021G06T2207/10028G06T2207/20224
    • Segmentation of background and foreground objects in an image is based upon the joint use of range and color data. Range-based data is largely independent of color image data, and hence not adversely affected by the limitations associated with color-based segmentation, such as shadows and similarly colored objects. Furthermore, color segmentation is complementary to range measurement in those cases where reliable range data cannot be obtained. These complementary sets of data are used to provide a multidimensional background estimation. The segmentation of a foreground object in a given frame of an image sequence is carried out by comparing the image frames with background statistics relating to range and normalized color, using the sets of statistics in a complementary manner. A background model is determined by estimating using a multidimensional histogram, recording pixel values, configuring the pixel values into a cluster, and selecting a largest cluster as representing the background model.
    • 图像中背景和前景对象的分割基于范围和颜色数据的联合使用。 基于范围的数据在很大程度上与彩色图像数据无关,因此不受与基于颜色的分割(例如阴影和类似彩色对象)相关联的限制的不利影响。 此外,在不能获得可靠范围数据的情况下,颜色分割与范围测量是互补的。 这些互补的数据集用于提供多维背景估计。 图像序列的给定帧中的前景对象的分割是通过将图像帧与范围和归一化颜色相关的背景统计数据进行比较,使用互补的统计量集进行的。 背景模型通过使用多维直方图估计,记录像素值,将像素值配置到聚类中,并选择最大的聚类来表示背景模型来确定。