Tinku A Acharya

US Patent:

6348929, Feb 19, 2002

Filed:

Jan 16, 1998

Appl. No.:

09/008131

Inventors:

Tinku Acharya - Tempe AZ
Werner Metz - Chandler AZ

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H04N 314

US Classification:

345660, 345666, 345667, 345668, 345669, 348273

Abstract:

A method for scaling of an image that includes providing an N-tap filter to be applied upon an image region and applying the N-tap filter variously to the image region and obtaining therefrom at least one scaled image pixel, such that N is equal to the scaling factor plus one. For instance, a 4:1 scaling procedure is achieved using a five-tap filter. By carefully selecting the coefficient of the five-tap filter, 2:1 scaling with a three-tap filter may be achieved using the same hardware and adding control signals and selectors. The scaling methodology and apparatus work directly in the CFA domain and provide efficient single pass dual-moded or multi-moded scaling capability.

US Patent:

6351555, Feb 26, 2002

Filed:

Jan 13, 2000

Appl. No.:

09/482551

Inventors:

Tinku Acharya - Tempe AZ
Werner Metz - Chandler AZ

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

G06K 900

US Classification:

382162, 382166, 382274

Abstract:

A companding method is disclosed where a set of factors related to the color characteristics of captured images are determined. Using these characteristics, a companding scheme is developed such that each pixel is lowered in resolution, but in such a manner that the image retains important features. These factors related to color characteristics are determined in part by analyzing histograms related to the image.

US Patent:

6356276, Mar 12, 2002

Filed:

Mar 18, 1998

Appl. No.:

09/040806

Inventors:

Tinku Acharya - Tempe AZ

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

G09G 504

US Classification:

345600, 345589, 345427, 345604

Abstract:

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.

US Patent:

6366692, Apr 2, 2002

Filed:

Mar 30, 1998

Appl. No.:

09/050743

Inventors:

Tinku Acharya - Tempe AZ

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

G06K 900

US Classification:

382162, 382167, 382300, 358518, 358525

Abstract:

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.

US Patent:

6366694, Apr 2, 2002

Filed:

Mar 26, 1998

Appl. No.:

09/048901

Inventors:

Tinku Acharya - Tempe AZ

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

G06K 900

US Classification:

382167, 382300, 358518, 358525

Abstract:

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.

US Patent:

6373481, Apr 16, 2002

Filed:

Aug 25, 1999

Appl. No.:

09/383117

Inventors:

Brent Thomas - Chandler AZ
Tinku Acharya - Tempe AZ

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

G06F 1300

US Classification:

345342, 348273

Abstract:

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.

US Patent:

6377280, Apr 23, 2002

Filed:

Apr 14, 1999

Appl. No.:

09/292763

Inventors:

Tinku Acharya - Tempe AZ

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

G06K 936

US Classification:

345667, 37524019, 382248, 382276, 345669, 345670, 345671

Abstract:

A method comprising constructing virtual (Discrete Wavelet Transform) DWT sub-bands from an image by 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. 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 by performing a DWT upon the image, applying an inverse DWT upon the virtual sub-bands, the result of the inverse DWT representing an up-sampled version of the image.

US Patent:

6381357, Apr 30, 2002

Filed:

Feb 26, 1999

Appl. No.:

09/258636

Inventors:

Tinku Acharya - Tempe AZ

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

G06K 900

US Classification:

382141, 348246

Abstract:

What is disclosed is a method including downloading a sequence of images from an image sensor, and then marking on a map a pixel location of the sensor defective if a Defective Vote score exceeds a first threshold, the score tallied over all captured images. The defective pixel map is stored on a host computer, which performs the defective pixel detection on behalf of the sensor, rather than directly on the device incorporating the image sensor.