Memory based VLSI architecture for image compression
    61.
    发明授权
    Memory based VLSI architecture for image compression 失效
    用于图像压缩的基于内存的VLSI架构

    公开(公告)号:US06694061B1

    公开(公告)日:2004-02-17

    申请号:US08885415

    申请日:1997-06-30

    申请人: Tinku Acharya

    发明人: Tinku Acharya

    IPC分类号: G06K936

    CPC分类号: G06T9/004

    摘要: An image compression apparatus is discussed that includes a first look-up table providing a quantized code, a second look-up table providing the length of that code, and a predictive coding circuit which generates an address for indexed those look-up tables.

    摘要翻译: 讨论了一种图像压缩装置,其包括提供量化码的第一查找表,提供该码的长度的第二查找表,以及生成用于索引这些查找表的地址的预测编码电路。

    Fuzzy distinction based thresholding technique for image segmentation
    63.
    发明授权
    Fuzzy distinction based thresholding technique for image segmentation 失效
    基于模糊区分的图像分割阈值技术

    公开(公告)号:US06625308B1

    公开(公告)日:2003-09-23

    申请号:US09393017

    申请日:1999-09-10

    IPC分类号: G06K900

    摘要: Embodiments of a fuzzy distinction based thresholding technique for image segmentation are disclosed. In one embodiment, at least one signal value level of the image is determined along which to divide a fuzzy histogram, the histogram being based, at least in part, on the image. The signal value represents a value which produces a divided fuzzy histogram with an extreme value of one of distinctiveness and fuzziness based on a measure of multidimensional distance between measurement distributions and their respective complements. The image is then segmented using the at least one signal value.

    摘要翻译: 公开了用于图像分割的基于模糊区分的阈值技术的实施例。 在一个实施例中,确定图像的至少一个信号值电平,沿着该信号值级别划分模糊直方图,直方图至少部分地基于图像。 信号值表示基于测量分布与它们各自的补码之间的多维距离的度量,产生具有独特性和模糊性的极值的分割模糊直方图的值。 然后使用至少一个信号值来分割图像。

    Mathematical model for gray scale and contrast enhancement of a digital image
    64.
    发明授权
    Mathematical model for gray scale and contrast enhancement of a digital image 失效
    数字图像灰度和对比度增强的数学模型

    公开(公告)号:US06535648B1

    公开(公告)日:2003-03-18

    申请号:US09207753

    申请日:1998-12-08

    申请人: Tinku Acharya

    发明人: Tinku Acharya

    IPC分类号: H04N146

    CPC分类号: H04N5/20 G06T5/007

    摘要: What is disclosed is a method that specifies identifying a category to which a pixel belongs and performing integrated contrast enhancement and gray scale adjustment on the pixel in accordance with the identified category. These enhanced/adjusted values may be looked up in a table constructed to contain a mapping for all such values.

    摘要翻译: 所公开的是指定识别像素所属的类别并根据所识别的类别对像素执行集成的对比度增强和灰度调整的方法。 可以在构造为包含所有这些值的映射的表中查找这些增强/调整的值。

    Integrated color interpolation and color space conversion algorithm from 8-bit bayer pattern RGB color space to 12-bit YCrCb color space
    65.
    发明授权
    Integrated color interpolation and color space conversion algorithm from 8-bit bayer pattern RGB color space to 12-bit YCrCb color space 失效
    集成颜色插值和色彩空间转换算法,从8位拜耳图案RGB色彩空间到12位YCrCb颜色空间

    公开(公告)号:US06392699B1

    公开(公告)日:2002-05-21

    申请号:US09034625

    申请日:1998-03-04

    申请人: Tinku Acharya

    发明人: Tinku Acharya

    IPC分类号: H04N314

    摘要: An integrated color interpolation and color space conversion technique and apparatus. A raw image that is arranged in a Bayer pattern where each pixel has only one of the color components needed to form a full color resolution pixel may be converted using this technique directly to a YCrCb image space without any intermediate conversion or interpolation steps. Specifically, in one instance, an 8-bit Bayer pattern raw image may be converted directly to a 12-bit YCrCb space in a single step approach. Such an integrated technique may more readily and inexpensively implemented in hardware such as on a digital camera, or in software.

    摘要翻译: 一种集成颜色插值和色彩空间转换技术和装置。 以Bayer图案布置的原始图像,其中每个像素仅具有形成全色分辨率像素所需的颜色分量之一,可以使用该技术直接转换到YCrCb图像空间,而无需任何中间转换或插值步骤。 具体来说,在一种情况下,8位拜耳图案原始图像可以以单步方式直接转换为12位YCrCb空间。 这样的集成技术可以在诸如数字照相机或软件的硬件中更容易和更便宜地实现。

    Pseudo-fixed length image compression scheme
    66.
    发明授权
    Pseudo-fixed length image compression scheme 失效
    伪固定长度图像压缩方案

    公开(公告)号:US06285796B1

    公开(公告)日:2001-09-04

    申请号:US08963335

    申请日:1997-11-03

    IPC分类号: H04N141

    CPC分类号: H04N19/50

    摘要: A method and apparatus for efficient image encoding in a predictive coding or other error image based image compression scheme, a pseudo-fixed length code is employed to convert certain calculated error values into codewords. The code is pseudo-fixed length since the length of codewords is fixed for a particular range of values and then increased for the next range. The length of codewords is not needed in decoding by choosing prefixes that uniquely distinguish codewords when packed together. As a result, efficient and quick image encoding/decoding is made possible.

    摘要翻译: 一种用于在预测编码或其他基于误差图像的图像压缩方案中有效图像编码的方法和装置,采用伪固定长度码将某些计算的误差值转换为码字。 代码是伪固定长度,因为码字的长度对于特定值的范围是固定的,然后在下一个范围内增加。 通过选择在打包在一起时唯一区分码字的前缀,解码中不需要码字的长度。 结果,有效和快速的图像编码/解码成为可能。

    DWT-based up-sampling algorithm suitable for image display in an LCD panel
    67.
    发明授权
    DWT-based up-sampling algorithm suitable for image display in an LCD panel 有权
    基于DWT的上采样算法适用于LCD面板中的图像显示

    公开(公告)号:US06236765B1

    公开(公告)日:2001-05-22

    申请号:US09129728

    申请日:1998-08-05

    申请人: Tinku Acharya

    发明人: Tinku Acharya

    IPC分类号: G06K936

    CPC分类号: G06T3/4084

    摘要: A method comprising constructing virtual (Discrete Wavelet Transform) DWT sub-bands; from an image without performing the DWT and then applying an inverse DWT upon the virtual sub-bands, the result of the inverse DWT representing an up-sampled version of the image. Alternatively, an apparatus comprising an interface configured to communicate image data, and an up-sampling unit, the up-sampling unit coupled to the interface to receive the image data, the up-sampling unit configured to construct virtual sub-band input data from the image data, the up-sampling unit configured to perform an inverse DWT upon the input data generating an up-sampled image therefrom. In an alternate embodiment, an apparatus comprising a computer readable medium having instructions which when executed perform constructing virtual (Discrete Wavelet Transform) DWT sub-bands from an image without performing the DWT, applying an inverse DWT upon the virtual sub-bands, the result of the inverse DWT representing an up-sampled version of the image.

    摘要翻译: 一种包括构建虚拟(离散小波变换)DWT子带的方法; 从不执行DWT并且然后对虚拟子带应用反向DWT的图像,反向DWT的结果表示图像的上采样版本。 或者,包括被配置为传送图像数据的接口和上采样单元的装置,所述上采样单元耦合到所述接口以接收所述图像数据,所述上采样单元被配置为构建虚拟子带输入数据, 所述图像数据,所述上采样单元被配置为根据从其生成上采样图像的输入数据执行逆DWT。 在替代实施例中,一种包括具有指令的计算机可读介质的装置,当执行执行时,执行从图像构建虚拟(离散小波变换)DWT子带而不执行DWT,在虚拟子带上应用反DWT,结果 的逆DWT表示图像的上采样版本。

    Image compression using directional predictive coding of the wavelet coefficients
    68.
    发明授权
    Image compression using directional predictive coding of the wavelet coefficients 失效
    使用小波系数的方向预测编码的图像压缩

    公开(公告)号:US06233358B1

    公开(公告)日:2001-05-15

    申请号:US09114720

    申请日:1998-07-13

    申请人: Tinku Acharya

    发明人: Tinku Acharya

    IPC分类号: G06K936

    摘要: What is disclosed is a method that includes determining the direction of most probable correlation of a transformed set of image data, and error encoding transformed data, the error determined between a transformed data value and a predicted neighbor data value in the determined direction. In an imaging apparatus that employs a DWT, or Discrete Wavelet Transform to compress an image, the direction of edges in the compressed data in used to generate a more highly correlated error image than typically provided for.

    摘要翻译: 所公开的是一种方法,其包括确定变换的图像数据集合的最可能相关的方向,以及错误编码变换数据,在所确定的方向上在变换的数据值和预测的相邻数据值之间确定的误差。 在采用DWT或离散小波变换来压缩图像的成像装置中,用于产生比通常提供的更高度相关的误差图像的压缩数据中的边缘的方向。

    Efficient algorithm and architecture for image scaling using discrete wavelet transforms
    69.
    发明授权
    Efficient algorithm and architecture for image scaling using discrete wavelet transforms 失效
    使用离散小波变换的图像缩放的高效算法和架构

    公开(公告)号:US06215916B1

    公开(公告)日:2001-04-10

    申请号:US09018601

    申请日:1998-02-04

    申请人: Tinku Acharya

    发明人: Tinku Acharya

    IPC分类号: G06K932

    CPC分类号: G06T3/4084

    摘要: What is disclosed is an image scaling technique and apparatus. The technique and apparatus utilizes a discrete wavelet transform (DWT). The DWT is applied row-wise to an image, which results in a low frequency sub-band and a high frequency sub-band. The DWT is again applied column-wise to the result of the row-wise DWT. The end result is a 2:1 scaled image. The process may be modified easily to obtain a 4:1 scaled image. Further, the architecture for computing the DWT provides high throughput and is composed, due to the nature of the DWT of address multipliers, registers and delay elements.

    摘要翻译: 公开的是图像缩放技术和装置。 该技术和装置利用离散小波变换(DWT)。 DWT被逐行应用于图像,其导致低频子带和高频子带。 DWT再次以列方式应用于逐行DWT的结果。 最终的结果是2:1的缩放图像。 该过程可以容易地修改以获得4:1的缩放图像。 此外,用于计算DWT的架构提供高吞吐量,并且由于地址乘法器,寄存器和延迟元件的DWT的性质而组合。

    Architecture for computing a two-dimensional discrete wavelet transform
    70.
    发明授权
    Architecture for computing a two-dimensional discrete wavelet transform 有权
    用于计算二维离散小波变换的架构

    公开(公告)号:US06178269B1

    公开(公告)日:2001-01-23

    申请号:US09130243

    申请日:1998-08-06

    申请人: Tinku Acharya

    发明人: Tinku Acharya

    IPC分类号: G06K936

    CPC分类号: G06F17/148

    摘要: The invention provides an integrated systolic architecture which can perform both forward and inverse Discrete Wavelet Transforms with a minimum of complexity. A plurality of processing cells, each having an adder and a multiplier, are coupled to a set of multiplexers and delay elements to selectively receive a single input datastream in the forward DWT mode and two datastreams in the inverse DWT mode. In the forward DWT mode, the integrated architecture decomposes the input datastream into two output sequences—a high frequency sub-band output and a low frequency sub-band output. In the inverse DWT mode, the integrated architecture reconstructs the original input sequence by outputting even terms and odd terms on alternating clock cycles. As a result, the architecture can achieve 100% utilization and is suitable to be implemented in VLSI circuitry.

    摘要翻译: 本发明提供了一种集成的收缩结构,其可以以最小的复杂度执行正向和反向离散小波变换。 多个具有加法器和乘法器的处理单元耦合到一组多路复用器和延迟元件,以选择性地接收正向DWT模式中的单个输入数据流,并且在反向DWT模式中接收两个数据流。 在正向DWT模式下,集成架构将输入数据流分解为两个输出序列,即高频子带输出和低频子带输出。 在逆DWT模式中,集成架构通过在交替的时钟周期上输出偶数项和奇数项来重建原始输入序列。 因此,架构可以实现100%的利用率,并且适合在VLSI电路中实现。