48results about How to "Improve encoding rate" patented technology

This invention relates to an error-check and error-correction code circuit for storages and a method for reading and writing data by it taking matrix G as a logic core including: a decoding process and a coding process and a method for writing in data by this method. Apart from a decoding process and an error correction process, it also includes a coding process, and finally puts forward an error check and correction and coding circuit for realizing said two methods including a decoder, an error-correction circuit, a coding circuit, an interface circuit and related data transmission circuit so as to simplify layout of bottom circuit and speed up operation speed of circuits.

An object of the present invention is to provide a method for suppressing peak power at a high encoding rate in a multi-carrier transmission system.

The present invention provides a transmitter for transmitting a multi-carrier signal, in which when generating 128 patterns used to suppress the peak power of 8-bit sub-carrier mapping signals from 7-bit information bits in a encoding unit 9, a sub-carrier generation unit 11, for example, divides the signal point of QPSK modulation into orthogonal groups, generates a sub-carrier mapping signal in which a part of sub-carriers is dependent on the signal point of another sub-carrier and a receiver for receiving such a multi-carrier signal.

The invention discloses an intra-frame prediction mode selection method and an intra-frame prediction mode selection system. The method comprises the following steps of: selecting one of Intra_4*4, Intra_8*8 and Intra_16*16 as an intra-frame prediction type of a current macroblock according to a frequency characteristic of the current macroblock; when the Intra_16*16 is selected, selecting one of intra-frame prediction modes which is selectable for the Intra_16*16 and has the minimum prediction error as the intra-frame prediction mode of the current macroblock; and when the Intra_8*8 or the Intra_4*4 is selected, dividing the current macroblock into four 8*8 pixel matrixes, namely B0, B1, B2 and B3 or 16 4*4 pixel matrixes from D0 to D15; and as to any 8*8 pixel matrix bi or 4*4 pixel matrix Dj, selecting a prediction direction for the pixel matrix Bi or Dj according to the relevance among the pixels in the pixel matrix Bi or Dj, and selecting one of the intra-frame prediction modes which is selectable for the Intra_8*8 or the Intra_4*4 and has the minimum prediction error in the prediction direction for the pixel matrix Bi or Dj as the intra-frame prediction mode of the pixel matrix Bi or Dj.

In the MSN encoded form, the symbols of each block of the present invention define a running digital sum (RDS) value, defined as RDS([a₀a₁ . . . a_N−1])=−Σ_i(−1)^a_i where the symbols a_i belong to the set {0, 1} and the sum extends for values of i from 0 to N−1. An encoder is configured to satisfy at least one of the following characteristics: a) blocks of symbols with a given length (L) are used for encoding, wherein RDS=RDS₀+4.K, where K is an integer, RDS is the said running digital sum, RDS₀ is defined as zero for even values of the said length (L), and one for odd values of said length (L), and b) blocks of symbols with a given length (L) are used for MSN coding and encoding is effected by selecting encoded blocks such that the set of running digital sum (RDS) values is the set with the minimum number of elements that satisfy the required rate value, defined as the ratio between the length of the input blocks and the length of the output blocks. A decoder with a simplified trellis structure is used for decoding (as in decoding a digital signal read from media on which the signal in question has been recorded via a vertical or perpendicular magnetic recording technique, for example).

Method for providing steganography in MIDI files. Present invention provides list steganography algorithms and methods for their application to MIDI files. Present invention further provides a 300% increase in average encoding rate and better implementation of stego-keys is achieved over previous MIDI steganography methods.

The invention discloses a mobile video monitoring method, a device and a system, wherein the mobile video monitoring method comprises the following steps of: A, carrying out new information detection on collected current frame video information; B, coding a new information frame when the new information frame exists and obtaining video coding data; and C, obtaining a current frame image after decoding the video coding data. The mobile video monitoring method, the device and the system have the advantages that the new information detection is carried out on the collected video information, thevideo information codes of the new information frame are uploaded only when the new information frame occurs, the coding rate is improved, the uploading data quantity is reduced, more images can be transmitted in a short time, in addition, useful video information can not be lost, and the monitoring effect is not influenced.

The invention provides an image coding method and device, electronic equipment and a storage medium, and relates to the technical field of image processing. The method comprises the steps: acquiring ato-be-coded image and a reference image, wherein the resolution of the reference image is different from that of the to-be-coded image; according to the to-be-coded image and the reference image, determining a frequency category to which each image block in the to-be-coded image belongs, wherein the reference image includes image blocks corresponding to the respective image blocks; and coding theto-be-coded image according to the frequency category to which each image block belongs. The definition of the image can be improved, and the size of the image is reduced.

The invention discloses an efficient video encoding method based on a vision attention priority. The method is centered on two contents including a vision attention priority annotation based on a movement-texture feature and a high-quality encoding optimization based on the vision attention priority. The method comprises the following steps: firstly, performing the attention annotation and priority judgment on an encoding unit when the movement grading of an encoding object is acted as a leading vision attention feature and texture information of the encoding object is acted as an auxiliary vision attention feature; and secondly, performing self-adaptive encoding conversion coefficient regulation to realize difference encoding aiming at regions in different attentions, and guaranteeing more optimal subjective vision quality under the same code rate.

The invention discloses a code word design method for DNA storage, which specifically comprises the following steps of: converting storage information into a DNA sequence, firstly converting the information into binary data, secondly, constructing a minimum variance Huffman tree, and compressing binary data by using the minimum variance Huffman tree, then, performing non-overlapping partitioning on the compressed binary data by taking 4 bits as a group to obtain at most 16 combinations, and sequentially selecting code words from the dictionary according to the probability of the combinations for mapping to obtain a DNA sequence, finally, obtaining the GC content of the DNA sequence, and if the GC content is higher than 60% or lower than 40%, adjusting the mapping relation to range from 40% to 60%, and further checking whether the DNA sequence contains more than 3 homopolymers, and if so, carrying out replacement and modification. The method has the characteristics of high coding rate and simple structure, and the coded DNA sequence also meets the constraint conditions that the GC content is between 40% and 60% and the running length of the homopolymer does not exceed 3.

The invention discloses a method for increasing a coding rate of a TLC flash. The method is characterized in that when an erasure frequency of a Block is smaller than a preset erasure inflection pointfrequency PE_tr, BCH is selected as a BER error correction algorithm of the Block; and when the erasure frequency of the Block is not smaller than the preset erasure inflection point frequency PE_tr,LDPC is selected as the BER error correction algorithm of the Block. By dynamically adjusting an error correction algorithm strategy in a life cycle of TLC NAND, namely, dynamically adjusting check data size, the coding rate of the TLC flash is expectedly improved on the whole.

The invention discloses a flat key and a locking machine, comprising a flat key, a shell and a rotatable lock core in the shell. A bending guide groove is formed on a flat surface on at least one lateral surface of the flat key; identification points are distributed along the guide groove; a sliding block is arranged in the lock core; guide posts matched with the guide grooves are arranged on the surface relative to the key of the sliding block; the inner wall of the shell is provided with a pair of grooves corresponding to each sliding block; two grooves in each pair of grooves are respectively positioned at two ends of the sliding block; one sliding block in two end parts of the sliding block enters the groove of the shell in the locked state; during unlocking, the sliding block is driven by pushing the guide posts through the key to move, so that the sliding block is positioned at the unlocking position in the middle of two grooves, both two end parts of the sliding block are positioned outside the grooves and the lock between the lock core and the shell can be removed; and a return spring for pushing the sliding block to leave from the unlocking position is arranged between the sliding block and the lock core. The flat key and the locking machine have the advantages of simple structure, high production efficiency, high code rate, safety and reliability.

The invention discloses a cloud-containing remote sensing image compression method based on a quantization strategy, and mainly solves the problems that in the prior art, surface feature information of a thin cloud coverage area cannot be kept, and coding consumption is large. According to the scheme, the method comprises the steps: expanding the boundaries of a cloud-containing remote sensing image and a cloud mask image, and performing downsampling and interpolation on a cloud area; calculating an approximate median of a region of interest of the cloud-containing remote sensing image; obtaining gray masks marked with different cloud areas and gray images marked with inner and outer edges of the different cloud areas; quantizing the cloud area of the cloud-containing remote sensing imageaccording to the cloud mask image; carrying out boundary smoothing on the quantized image of the cloud area in combination with the gray images of the inner edge and the outer edge of the cloud area;subtracting a median from the values of all the pixel points in the smoothed image, performing compressed coding, and sending a code stream to a receiving end; and by the receiving end, decoding the code stream to obtain a recovered image. Coding consumption is reduced, information of a thin cloud coverage area can be partially reserved, and the method can be used for transmission of cloud-containing images.