公开(公告)号：US20230206389A1

公开(公告)日：2023-06-29

申请号：US18088794

申请日：2022-12-27

Applicant: Realtek Semiconductor Corp.

Inventor： Tsung-Hsuan Li ,  Wan-Ju Tang ,  Shih-Tse Chen

IPC: G06T3/40 ,  G06T9/00

CPC classification number: G06T3/40 ,  G06T9/00

Abstract: The present invention provides a compression method, wherein the compression method includes the steps of: setting a quantization function; setting a plurality of scaling ratios; receiving image data; for a block of a frame of the image data, using a conversion matrix to convert data of the block to generate a plurality of converted data; determining a specific scaling ratio from the plurality of scaling ratios according to the plurality of converted data; and using the quantization function to perform a quantization operation on a plurality of adjusted data to generate compressed data, wherein the plurality of adjusted data are generated according to the plurality of converted data and the specific scaling ratio.

公开(公告)号：US11200422B2

公开(公告)日：2021-12-14

申请号：US16929189

申请日：2020-07-15

Applicant: REALTEK SEMICONDUCTOR CORP.

Inventor： Wan-Ju Tang ,  Tsung-Hsuan Li ,  Shih-Tse Chen

IPC: G06K9/00 ,  G06K9/62 ,  G06T7/20 ,  G06F9/54 ,  G06K9/40

Abstract: A method and a system for pixel channel imbalance compensation for an image sensing circuit are provided. The system includes an image acquisition circuit having a lens, a color filter and an image sensor and a processing circuit. In the method performed by the processing circuit, a second frame image is retrieved from a motion image, and a first frame image that has undergone noise reduction can be retrieved from a memory. Motion detection is performed between the frames by comparing the first frame image and the second frame image. The motion detection is referred to as a reference for determining how to perform 3D noise reduction. A compensation value for channel imbalance between the adjacent channels can be estimated based on the image under noise reduction in a same buffer. While the pixel channel imbalance is compensated, the image is then restored by an interpolation method.

公开(公告)号：US11062429B2

公开(公告)日：2021-07-13

申请号：US16749688

申请日：2020-01-22

Applicant: REALTEK SEMICONDUCTOR CORP.

Inventor： Wan-Ju Tang ,  Tsung-Hsuan Li ,  Shih-Tse Chen

IPC: G06T5/00 ,  G06T5/10 ,  G10L21/0232 ,  G06T5/20

Abstract: A denoising method based on a signal-to-noise ratio (SNR), which includes: obtaining a current input coefficient; obtaining a current noise standard deviation by querying a first relationship table; querying a second relationship table according to the current noise standard deviation and the current input coefficient to obtain a current slope corresponding to the current input coefficient; generating a current output coefficient by multiplying the current input coefficient and a compression magnification function; and calculating the current output coefficient by substituting the current noise standard deviation, the current input coefficient, and the current slope.

公开(公告)号：US11800108B2

公开(公告)日：2023-10-24

申请号：US17695953

申请日：2022-03-16

Applicant: REALTEK SEMICONDUCTOR CORP.

Inventor： Wan-Ju Tang ,  Tsung-Hsuan Li ,  Shih-Tse Chen

IPC: H04N19/124 ,  H04N19/13 ,  G06F7/58 ,  H04N19/186 ,  H04N19/176

CPC classification number: H04N19/124 ,  G06F7/588 ,  H04N19/13 ,  H04N19/176 ,  H04N19/186

Abstract: A method for image compression and a circuit system thereof are provided. In the method, pixel values of an image are obtained. A compression scenario is decided, for example, a uniform-quantization manner or a non-uniform-quantization manner is used for an M-bit image being compressed to an N-bit image so as to decide codeword sections for the image. Every codeword section has a codeword distance. The codeword sections have a fixed codeword distance in the uniform-quantization manner. Alternatively, in the non-uniform-quantization manner, the image can be divided into multiple codeword sections having different codeword distances according to a brightness distribution. Afterwards, a random number is generated for deciding codeword and index for original value of each of the pixels. An index table is accordingly formed. The index table is provided for obtaining the codeword in a decoding process by querying a codebook with the index.