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：US10223778B2

公开(公告)日：2019-03-05

申请号：US15476209

申请日：2017-03-31

Applicant: REALTEK SEMICONDUCTOR CORP.

Inventor： Hao-Tien Chiang ,  Tsung-Hsuan Li ,  Shih-Tse Chen

IPC: G06T5/40 ,  G06T11/00

Abstract: An image contrast enhancement method and an apparatus thereof are disclosed, which calculate the degree of influencing the clarity according to the influence feature (e.g., heavy fog, dust, smoke, or etc.) in the image, and then adjust the brightness of the pixels corresponding to features of influencing the clarity according to the degree, thereby enhancing image contrast and removing phenomenon of influencing the clarity in the image.

公开(公告)号：US10964029B2

公开(公告)日：2021-03-30

申请号：US16653989

申请日：2019-10-15

Applicant: Realtek Semiconductor Corp.

Inventor： Shang-Lun Chan ,  Tsung-Hsuan Li ,  Chao-Hsun Yang ,  Shih-Tse Chen

IPC: G06T7/215 ,  G06T7/90 ,  G06T7/136 ,  G06T7/11

Abstract: A method of updating background model for an image processing device is disclosed. The method includes receiving at least a background image, counting a number of occurrences of a color of each pixel of the background image according to a color information of each pixel of the at least a background image, to establish a background model including a statistical color information about the color and the number of occurrences of the color, receiving a current image, and determining whether to update the number of occurrences of the color in the background model corresponding to a color of each pixel of the current image according to a color information of each pixel of the current image and a result of comparing a random number with a threshold.

公开(公告)号：US20210004938A1

公开(公告)日：2021-01-07

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 ,  G06T5/20 ,  G10L21/0232

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：US10055820B2

公开(公告)日：2018-08-21

申请号：US15439357

申请日：2017-02-22

Applicant: REALTEK SEMICONDUCTOR CORP.

Inventor： Tsung-Hsuan Li ,  Hao-Tien Chiang ,  Shih-Tse Chen

IPC: G06K9/40 ,  G06T5/00 ,  G06K9/46 ,  G06K9/62 ,  G06T5/50

CPC classification number: G06T5/002 ,  G06K9/4661 ,  G06K9/6276 ,  G06T5/50 ,  G06T2207/10016 ,  G06T2207/20182 ,  G06T2207/20216 ,  G06T2207/20224

Abstract: An image de-noising method and an apparatus thereof are disclosed, which includes categorizing a pixel in a current frame into a first low-frequency pixel having a first weight and a first high-frequency pixel having a second weight; categorizing a previous pixel corresponding to the position of the pixel in a previous frame into a second low-frequency pixel having a third weight and a second high-frequency pixel having a fourth weight; adjusting the first weight and the third weight and calculating the weighted sum of the first low-frequency pixel and the second low-frequency pixel, to generate low-frequency pixel data; adjusting the second weight and the fourth weight and calculating the weighted sum of the first high-frequency pixel and the second high-frequency pixel, to generate high-frequency pixel data; and calculating the sum of the low-frequency pixel data and the high-frequency pixel data, to output the de-noised pixel.

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.

公开(公告)号：US20230162333A1

公开(公告)日：2023-05-25

申请号：US17720280

申请日：2022-04-13

Applicant: Realtek Semiconductor Corp.

Inventor： Yu-Hsuan Kuan ,  Tsung-Hsuan Li ,  Shih-Tse Chen

IPC: G06T5/00 ,  G06T5/20 ,  G06T7/90 ,  G06T7/11

CPC classification number: G06T5/008 ,  G06T5/20 ,  G06T7/90 ,  G06T7/11

Abstract: An image processing method includes: receiving an input image; performing a low-frequency image regulating operation to regulate the local intensity of the image of pixel unit(s) according to low-frequency information of the image of pixel unit(s) of the input image; performing a high-frequency image regulating operation to improve the details of the image of pixel unit(s) according to high-frequency information of the image of pixel unit (s) of the input image; and, generating an output image according to the input image, the low-frequency image regulating operation, and the high-frequency image regulating operation.

公开(公告)号：US11651495B2

公开(公告)日：2023-05-16

申请号：US17123228

申请日：2020-12-16

Applicant: REALTEK SEMICONDUCTOR CORP.

Inventor： Yang-Ting Chou ,  Tsung-Hsuan Li ,  Shih-Tse Chen

IPC: G06T5/00 ,  G06T5/20 ,  G06T7/00 ,  G06T7/11 ,  G06T7/90

CPC classification number: G06T7/11 ,  G06T5/008 ,  G06T5/20 ,  G06T7/0002 ,  G06T7/90 ,  G06T2207/10024 ,  G06T2207/30168

Abstract: A method and a system for image correction are provided. The system includes an image processor that performs the method for image correction when receiving an input image. In the method, an overexposed area within the image is determined. The channel values of pixels in the overexposed area are applied with corresponding weights. An automatic white balance process is performed on the channel values of pixels in the overexposed area according to an expectation of low saturation in the overexposed area. Besides a first channel value of each of the pixels, a second channel value and a third channel value of the pixel can be estimated according to the channel values of periphery pixels. A correction value overexposed of the first channel value of the current pixel can be calculated according to the corresponding weights of the pixels in the overexposed area.

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.