Marvell International Limited

Hongxin Li

Bradley C Aldrich

Li Xu

Adam George

Matthew P Wingert

Jun Liu

Beryl Xu

Wenyi Su

System and methods are provided for performing image noise reduction. A pixel having an initial pixel value is selected from an image for performing noise reduction, wherein the image is stored in a data structure in a non-transitory computer-readable storage medium. A block window including a plurality of pixel blocks associated with the selected pixel is determined, wherein a pixel block includes a plurality of pixels. A plurality of pixel block average values for the plurality of pixel blocks are calculated, wherein a pixel block average value corresponds to an average pixel value of a pixel block. A weighted average of the plurality of pixel block average values with respect to the selected pixel is calculated using a bilateral filtering algorithm. The data structure is updated by replacing the initial pixel value of the selected pixel with the weighted average of the plurality of pixel block average values.

System and method for reducing image noise

System and methods are provided for performing image noise reduction. Color estimation of a pixel in an image is performed, wherein the image is stored in a data structure in a non-transitory computer-readable storage medium and the pixel has an initial pixel value. A pixel-block size is selected for pixel block similarity calculations based at least in part on the color estimation. One or more first pixel blocks associated with the pixel of the selected pixel-block size are determined. One or more first pixel block average values for the one or more first pixel blocks are calculated. A weighted average of the first pixel block average values is calculated. The data structure is updated by replacing the initial pixel value of the pixel with the weighted average of the first pixel black average values.

System and methods are provided for performing color lens shading correction. A plurality of mesh points are generated. Mesh gain parameters associated with the mesh points are determined. The mesh gain parameters are applied to an input image for color lens shading correction. A color entropy related to color distribution of the corrected input image is obtained. The mesh gain parameters are adjusted to reduce the color entropy.

Systems and methods for color lens shading correction

An image capture system including a statistics module. An image processing module is configured to receive image data corresponding to a plurality of pixels of a captured image, wherein the image data includes respective locations of each of the plurality of pixels, and implement an image processing pipeline configured to modified image data. The statistics module is configured to gather a plurality of sets of statistics using the image data and the modified image data, each of the sets of statistics corresponding to a different one of a plurality of zones within the captured image. To gather the statistics, the statistics module is further configured to determine, based on the respective location of a first pixel, a first zone of the plurality of zones that the first pixel is located in, and store data in a corresponding set of statistics for the first pixel based on the determined first zone.

Image capture system and method for gathering statistics for captured image data

Distortions in digital image data, for example, radial falloff and improper white balance, are corrected without introducing artifacts in saturated regions or causing near-saturated regions to become saturated. The approach avoids pushing near-saturated colors into saturation by assuring that the total gain applied to a pixel channel is always less than 1. A spatially adaptive clamp threshold is used to clamp color values for a pixel after the color channel color values have been gain-adjusted. In this manner, saturated pixel color values that have been shifted-down into non-saturated regions are clamped to a maximum valid value and are presented as white in images generated from the gain-adjusted image data. One example embodiment may calculate an adaptive clamp threshold for each pixel in the image data. Another example embodiment may calculate an adaptive clamp threshold for each pixel in a row of pixels in the image data.

Preventing color artifacts in overexposed regions and preserving maximum signals in near-overexposed regions of digital images

An imaging device and an image crosstalk analysis device are described that may be used to reduce optical crosstalk and radial fall-off in image data. The imaging device may include an image processing unit that applies corrections to the raw image data using newly developed correction algorithms and correction parameters that are generated for the imaging device by the image crosstalk analysis device based on an analysis of uncorrected image data generated by the imaging device. The correction parameters generated for a single imaging device may be loaded to imaging devices of the same make and model as part of the imaging device manufacturing process. Due to the flexible nature of the described processing techniques in which the control parameters are used, improved image quality may be achieved in every image generated by the respective manufactured cameras.

Reducing optical crosstalk and radial fall-off in imaging sensors

A system includes a block module, a zone module, a statistics module, and a control module. The block module is configured to associate pixel values generated by pixel sensors of an image sensor with M regions. The zone module is configured to define N zones in the M regions. Each of the N zones includes an adjustable number of the M regions. N and M are integers greater than one and N is less than or equal to M. The statistics module is configured to gather statistics corresponding to the N zones. The control module is configured to adjust pixel values generated by the pixel sensors based on the statistics.

Method and apparatus for multiple zone statistics collection for digital image/video capture systems

An audio decoding system comprises a buffer module that receives packets including encoded audio frames that each store audio parameters. A packet loss concealment module that selectively extracts the audio parameters from ones of the encoded audio frames, determines recovered audio parameters based on the extracted audio parameters, and encodes the recovered audio parameters into recovered audio frames. An audio decoding module that decodes the encoded audio frames and the recovered audio frames and outputs decoded audio samples.

Adaptive jitter buffer-packet loss concealment

A packet loss concealment system includes first and second buffers that stores audio samples prior to and subsequent to a missing section of audio samples. A forward propagation module generates a forward propagated waveform by propagating a first waveform period that is based on the first buffer. The forward propagation module increases periodicity of the first waveform period nonlinearly when propagating the first waveform period. A backward propagation module generates a backward propagated waveform by propagating a second waveform period that is based on the second buffer. A ratio control module selectively determines a ratio between a first periodicity of the audio samples in the second buffer and a second periodicity of the audio samples in the first buffer. The forward propagation module selectively propagates the first waveform period using the ratio, and the backward propagation module selectively propagates the second waveform period using an inverse of the ratio.

An audio decoding system comprises a buffer module, an audio decoding module, a packet loss concealment module, an uncompressed adjustment module, and a playout control module. The buffer module receives packets including audio data. The audio decoding module decodes the audio data and outputs decoded audio samples. The packet loss concealment module outputs adjusted audio samples based on the decoded audio samples. The adjusted audio samples include reconstructed samples when packet loss occurs. The uncompressed adjustment module incorporates the adjusted audio samples into an output stream of audio samples at a first rate. The playout control module regulates the first rate based on packet delay information.

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Shanghai, China

Hongxin Li