公开(公告)号：US06373481B1

公开(公告)日：2002-04-16

申请号：US09383117

申请日：1999-08-25

申请人： Yap-Peng Tan ,  Brent Thomas ,  Tinku Acharya

发明人： Yap-Peng Tan ,  Brent Thomas ,  Tinku Acharya

IPC分类号： G06F1300

CPC分类号： H04N5/23212

摘要： In one embodiment, a method for determining a focus value in an image, including selecting an area of interest in the image and a color plane of interest, is described. The color plane of interest within the area of interest is filtered to produce a filtered region. The mean absolute value of the filtered region is determined.

摘要翻译： 在一个实施例中，描述了用于确定图像中的聚焦值的方法，包括选择图像中的感兴趣区域和感兴趣的颜色平面。 滤去感兴趣区域内感兴趣的色平面以产生过滤区域。 确定过滤区域的平均绝对值。

公开(公告)号：US06366692B1

公开(公告)日：2002-04-02

申请号：US09050743

申请日：1998-03-30

申请人： Tinku Acharya

发明人： Tinku Acharya

IPC分类号： G06K900

CPC分类号： H04N9/045 ,  G06T3/4007 ,  G06T3/4015

摘要： What is disclosed is 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 XYZ space image without any intermediate conversion or interpolation steps. Specifically, in one instance, an 8-bit Bayer pattern raw image may be converted directly to a 24-bit XYZ space in a single pass 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： 所公开的是集成颜色插值和颜色空间转换技术和装置。 布置成拜耳图案的原始图像，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XYZ空间图像，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在单程方式中直接转换为24位XYZ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。

公开(公告)号：US6154493A

公开(公告)日：2000-11-28

申请号：US83383

申请日：1998-05-21

申请人： Tinku Acharya ,  Lina J. Karam ,  Francescomaria Marino

发明人： Tinku Acharya ,  Lina J. Karam ,  Francescomaria Marino

IPC分类号： H04N11/04 ,  G06T9/00 ,  H04N1/41 ,  H04N1/64 ,  H04N7/26 ,  H04N7/30 ,  H04N7/12

CPC分类号： H04N1/648 ,  H04N19/186 ,  H04N19/63 ,  H04N19/10 ,  H04N19/102

摘要： What is disclosed is a method that includes splitting raw image data into a plurality of channels including color plane difference channels, and then compressing separately each of these channels using a two-dimensional discrete wavelet transform, the compression utilizing quantization, whereby the recovery of the compressed channel data yielding a perceptually lossless image. The method and apparatus operates on images directly in their Bayer pattern form. Quantization thresholds are defined for the quantizing which may vary depending upon the channel and DWT sub-band being processed.

摘要翻译： 所公开的方法是将原始图像数据分割成包括彩色平面差分通道的多个通道，然后使用二维离散小波变换（利用量化的压缩）分开地压缩这些通道中的每一个，从而恢复 压缩通道数据产生感知无损图像。 该方法和装置以其拜耳模式形式直接对图像进行操作。 量化阈值被定义用于量化，其可以根据正在处理的信道和DWT子带而变化。

公开(公告)号：US6094508A

公开(公告)日：2000-07-25

申请号：US986461

申请日：1997-12-08

申请人： Tinku Acharya ,  Ping-Sing Tsai

发明人： Tinku Acharya ,  Ping-Sing Tsai

IPC分类号： G06T7/60 ,  G06T5/00 ,  G06K9/48

CPC分类号： G06T7/0083 ,  G06T2207/10016 ,  G06T2207/20192

摘要： What is disclosed is a method for dynamically and automatically determining the threshold value for edge detection based on localized intensity information. Each pixel can be assigned a threshold to which its gradient or other intensity change information can be compared so as to detect whether or not the pixel belongs to an edge feature of the image or not. Further, the thresholding can be based upon the response of the human vision system so that visual appearance of the image to users is considered when analyzing localized intensity information. The localized thresholding technique can be applied to any edge detection scheme.

摘要翻译： 所公开的是基于局部强度信息来动态地并且自动地确定用于边缘检测的阈值的方法。 可以为每个像素分配其梯度或其他强度变化信息可以进行比较的阈值，以便检测像素是否属于图像的边缘特征。 此外，阈值化可以基于人类视觉系统的响应，使得在分析局部强度信息时考虑到用户的图像的视觉外观。 局部阈值技术可以应用于任何边缘检测方案。

公开(公告)号：US6009206A

公开(公告)日：1999-12-28

申请号：US940458

申请日：1997-09-30

申请人： Tinku Acharya

发明人： Tinku Acharya

IPC分类号： G06T3/40 ,  H04N1/41 ,  G06K9/38 ,  G06T5/40 ,  G06T9/00

CPC分类号： G06T3/40

摘要： What is disclosed is a mapping circuit configured to map a range of captured intensity values to a companded intensity level based upon the density of captured intensity values present in the captured image. Also provided is a companding circuit coupled to the mapping circuit, the companding circuit configured to replace each pixel of the captured image with a corresponding mapped intensity value pixel. The companding circuit and mapping circuit are configured to preserve image characteristics.

摘要翻译： 公开的是映射电路，其被配置为基于存在于所捕获的图像中的捕获强度值的密度将捕获的强度值的范围映射到压缩强度级。 还提供了耦合到映射电路的压扩电路，压缩电路被配置为用对应的映射强度值像素替换捕获图像的每个像素。 压扩电路和映射电路被配置为保持图像特性。

公开(公告)号：US6009201A

公开(公告)日：1999-12-28

申请号：US884923

申请日：1997-06-30

申请人： Tinku Acharya

发明人： Tinku Acharya

IPC分类号： H04N7/32 ,  G06K20060101 ,  G06K9/36 ,  G06K9/38 ,  G06K9/46 ,  H04N1/32 ,  H04N1/41

CPC分类号： H03M7/6041 ,  H03M7/3059 ,  H03M7/3075 ,  H04N19/91

摘要： An image compression scheme is disclosed which models the human visual perception system. Using quantization of image error values, according to a visually-lossless scheme, an image can be compressed such that it is visually indistinguishable to the naked eye from the original image. To aid in image compression on portable devices such as a digital camera, the quantization can be precoupled into a look-up table.

摘要翻译： 公开了一种对人类视觉感知系统进行建模的图像压缩方案。 使用图像误差值的量化，根据视觉上无损的方案，可以压缩图像，使得其与原始图像在目视上与肉眼无法区分。 为了帮助诸如数码相机的便携式设备上的图像压缩，可以将量化预耦合到查找表中。

公开(公告)号：US5875122A

公开(公告)日：1999-02-23

申请号：US767976

申请日：1996-12-17

申请人： Tinku Acharya

发明人： Tinku Acharya

IPC分类号： G06F15/80 ,  G06F15/00

CPC分类号： G06F15/8046

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被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，并且在逆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。