Patent application number | Description | Published |
20100166093 | METHOD FOR ESTIMATING PHASE ERROR IN MIMO OFDM COMMUNICATIONS SYSTEM - A method for estimating a phase error existing in a receiver of a MIMO OFDM communications system is disclosed. The method includes executing Hermitian transpose on channel coefficient matrix of the MIMO OFDM communications system for generating Hermitian-transposed channel coefficient matrix, multiplying received signal matrix of the receiver with the Hermitian-transposed channel coefficient matrix for generating converted signals, summing products of the converted signals and complex conjugates of pilot signals corresponding to the converted signals for generating a sum result, and generating the phase error according to the sum result, the converted signals, and the complex conjugates of the pilot signals. The pilot signals are extracted from the received signal matrix. | 07-01-2010 |
20100202570 | Method for estimating phase error in MIMO OFDM communications system - A method for estimating a phase error existing in a receiver of a MIMO OFDM communications system is disclosed. The method includes executing Hermitian transpose on channel coefficient matrix of the MIMO OFDM communications system for generating Hermitian-transposed channel coefficient matrix, multiplying received signal matrix of the receiver with the Hermitian-transposed channel coefficient matrix for generating converted signals, summing products of the converted signals and complex conjugates of pilot signals corresponding to the converted signals for generating a sum result, and generating the phase error according to the sum result, the converted signals, and the complex conjugates of the pilot signals. The pilot signals are extracted from the received signal matrix. | 08-12-2010 |
20110261908 | SOFT DEMAPPING METHOD AND APPARATUS AND COMMUNICATION SYSTEM THEREOF - An exemplary embodiment of the present disclosure provides a soft demapping method. In the soft demapping method, each shortest Euclidean distance of the Euclidean distances from all possible signal vectors corresponding to the bits which are not obtained during a signal detection to a received signal vector is calculated by using channel state information (CSI) and modulation coefficients, so as to establish a complete bit vector-shortest distance mapping table, and a log likelihood ratio (LLR) of each bit is obtained according to the bit vector-shortest distance mapping table. The soft demapping method can be applied along with different signal detection techniques to decode a received signal vector into a bit vector, wherein the signal detection techniques include a maximum likelihood detection (MLD) technique and a sphere decoding (SD) technique. | 10-27-2011 |
20120030203 | METHOD FOR ESTABLISHING MULTIPLE LOOK-UP TABLES AND DATA ACQUISITION METHOD USING MULTIPLE LOOK-UP TABLES - A method for establishing multiple look-up tables and a data acquisition method using multiple look-up tables are provided. In the present method, a plurality of input data is classified into a plurality of groups, and a plurality of input data and a plurality of output data corresponding to the input data are respectively provided to the groups to establish a plurality of corresponding look-up tables. At least one bit is selectively removed from the input data in each of the look-up tables corresponding to at least one of the groups, and the result input data and the corresponding output data are recorded in the look-up table corresponding to the group. | 02-02-2012 |
20120082269 | METHOD FOR CHANNEL ESTIMATION AND DELAY SPREAD APPROXIMATION IN A WIRELESS COMMUNICATION SYSTEM - A method for delay spread approximation used in a wireless communication system comprises the steps of: retrieving a plurality of pilot symbols from a channel of a wireless communication system; calculating at least one parameter representing the shape of the frequency response of the channel according to the values and the relative positions of the pilot symbols; determining a representative parameter value according to the at least one parameter; and determining a delay spread value according to the representative parameter value. | 04-05-2012 |
Patent application number | Description | Published |
20080309779 | FOCUSING METHOD, SUITABLE FOR AN IMAGE CAPTURING APPARATUS USING IN AN ENVIRONMENT OF LOW BRIGHTNESS AND IMAGE CAPTURING APPARATUS USING THE SAME - A focusing method, suitable for an image capturing apparatus using in an environment of low brightness, is provided herein. The focusing method includes that an image sensing unit in the image capturing apparatus is wholly or partially divided into a plurality of regions, and digital image data sensed by the image sensing unit is divided into a plurality of sets corresponding to the regions of the image sensing unit. The regional image data corresponding to each of the regions are summed up during the focusing step, so as to obtain a sum of data for each region. Each sum of data is used to calculate a corresponding contrast value, and the contrast value is used to perform calculations for the focusing step, so as to obtain a focus. | 12-18-2008 |
20090003695 | METHOD AND CIRCUIT FOR CORRECTING SIGNALS AND IMAGE CORRECTING METHOD AND CIRCUIT USING THE SAME - A signal correcting method and a circuit thereof are provided. In the method, first, the values of a plurality of input signals are clamped to generate a plurality of corresponding clamping signals according to a plurality of adjustable predetermined values. Then, a combined multiplication operation is performed to the clamping signals according to the coefficients in a matrix obtained by multiplying the coefficients in at least two predetermined correcting matrixes, so as to output a plurality of results. Next, the results are respectively clamped according to a plurality of corresponding predetermined thresholds so as to output the corrected input signals. | 01-01-2009 |
20090021526 | DETERMINATION METHOD FOR WHITE-POINT AND CORRECTION METHOD OF THE WHITE BALANCE - A determination method for white-point and a correction method of the white balance are disclosed. In the determination method for white-point of the white balance, first gray cards with different reflection coefficients are detected according to the properties of an image sensing device. Next, the white-point gray line of a first color temperature and the white-point gray line of a second color temperature are intersected on a white-point plane to form a fan area, so as to set the white-point range of the low saturation of the image sensing device. Next, the vertical projection for an image datum is calculated to obtain a placement datum on the white-point plane, and a difference value between the image datum and the placement datum is calculated. Finally, whether the image datum is a white-point is determined according to the difference value and relationship between the placement datum and the fan area. | 01-22-2009 |
20100104180 | IMAGE NOISE REDUCTION METHOD AND IMAGE PROCESSING APPARATUS USING THE SAME - An image noise reduction method is provided. An image is received. A first-stage process is performed to the image to obtain a luminance information Y and a color information Cb and/or Cr corresponding to a pixel array in an YCbCr domain. A second-stage process is performed to the luminance information Y to reduce at least a luminance noise. A third-stage process is performed to the color information Cb and/or Cr to reduce at least a color noise. The luminance information Y and the color information Cb and/or Cr are then combined. | 04-29-2010 |
20100284619 | FACE DETECTION APPARATUS AND FACE DETECTION METHOD - A face detection apparatus and a face detection method thereof are provided. The face detection apparatus includes a rectangle integral image unit, a feature mapping unit and a cascade and score unit. The rectangle integral image unit provides a rectangle integral image according to an original image. The feature mapping unit determines a face candidate region according to rectangular face feature templates, and calculates feature values of the rectangular face feature templates according to the rectangle integral image. The cascade and score unit judges whether the face candidate region conforms to cascade conditions or not, and gives the face candidate region a score according to the feature values when the face candidate region conforms to the cascade conditions. The face candidate region is a non-face region if the score of the face candidate region is lower than a threshold value. | 11-11-2010 |
20140153840 | METHOD FOR CORRECTING ROLLING SHUTTER EFFECT AND IMAGE PROCESSING DEVICE USING THE SAME - A method for correcting a rolling shutter effect is provided. The method includes: obtaining feature point pairs in images, wherein each of the feature point pairs corresponds to a motion vector; obtaining sampling points between two consecutive images in time; setting a moving velocity and an angular velocity of an image capturing unit at each of the sampling points as variables; obtaining estimating motion vectors according to the variables, a focal length of the image capturing unit, and row locations where the feature point pairs are located; executing an optimization algorithm according to a difference between the motion vectors and the estimating motion vectors, to calculate the moving velocity and the angular velocity corresponding to the variables; varying locations of pixels in an image according to the moving velocity and the angular velocity, to generate a first corrected image. Thereby, the rolling shutter effect in an image is removed. | 06-05-2014 |
20140160113 | METHOD AND IMAGE PROCESSING DEVICE FOR ADJUSTING STEREO IMAGE - A method and an image processing device for adjusting a stereo image are provided. The method includes: obtaining a disparity map between a first image and a second image; dividing the disparity map into layers which correspond to first layers of the first image and second layers of the second image; generating a first cost according to displacements of pixels of an i | 06-12-2014 |
20140193098 | Image Processing Method and Image Processing Device Thereof for Image Alignment - An image processing method for image alignment, includes sequentially receiving a plurality of images; generating at least one threshold corresponding to each image according to a plurality of intensities of each image of the plurality of images; converting each image according to the thresholds of each image, for generating a plurality of binary images; acquiring a plurality of characteristic pixels of each binary image according to the plurality of binary images; and aligning the plurality of images according to the plurality of characteristic pixels of each binary image. | 07-10-2014 |