摘要:
A method for the arithmetical calculation of two-dimensional transforms including two time steps of multiplication and accumulation, of which the first step is assigned to the product of the data and of the coefficient matrices and the second step is assigned to the subsequent product by the transposed coefficient matrix. Moreover, preferably the data to be transformed and the corresponding coefficients are supplied to a first multiplication step in time succession, possibly after their storage in an appropriate memory. The device for the attainment of the method includes two multipliers with their corresponding accumulator, a random-access type memory for storing the data to be transformed and the transform coefficients, a multiplexer which receives the data first from the input and then from the memory and arranges them in a time succession for the supply to a first multiplier, and a shift register which receives the transform coefficients from the memory and arranges them for the supply to the second multiplier.
摘要:
A device for filtering video images, of the type which includes first and second circuit portions, each having first and second input terminals respectively adapted to receive digitalized luminance and chrominance components of a television signal, and an output terminal coinciding with an output terminal of the device. The first and second circuit portions further include first, second and third filters, cascade coupled to one another, and a fourth filter, respectively. The first, second and third filters incorporate a computational circuit which uses a logic of the fuzzy type to process the digitalized luminance component. The fourth filter includes a computational circuit which processes the digitalized chrominance components based upon a parameter supplied from the second filter.
摘要:
The fuzzy filtering of a noise signal comprising a plurality of signal samples [s(t,k)] is carried out using as variables the variation of the signal in the considered window and the distance of the samples from a sample to be reconstructed, to distinguish the typical variations of the original signal from those due to the noise and to identify the signal fronts. The method comprises the steps of defining a current signal sample [s(t)] from among the plurality of signal samples, calculating a plurality of difference samples [D(t,k)] as the difference in absolute value between the current signal sample and each signal sample and defining distance values (k) between the current signal sample and each signal sample. The method further comprises determining weight parameters [P(k)] on the basis of the difference samples and the distance values by means of fuzzy logic and weighing the signal samples with the weight parameters so as to obtain a reconstructed signal sample [o(t)].
摘要:
A filter performs a reduction of pulsed noise in video images in accordance with fuzzy logic. An interface circuit of the filter receives consecutive digital signals in time corresponding to the video images and generates an image window having a digital signal to be processed at the center. The filter also has a comparator block, a plurality of digital subtractors, and a memory circuit connected in cascade to the comparator block. The filter also has a filtering circuit that organizes values of digital signals of the video image, and an arithmetic block that performs a switch between the digital signal to be processed and the output of the filtering circuit on the basis of the values taken by the parameter.
摘要:
An architecture for an electronic controller operated using fuzzy logic, including an input section with a plurality of inputs for analog or digital signals, a central control unit provided with memories wherein fuzzy logic membership functions are stored) and a defuzzyfier section has its input section composed of a plurality of fuzzyfiers arranged in parallel and independent of one another, each fuzzyfier including an analog input and a digital input for receving signals from external sensors, and digital outputs connected to the input of a corresponding read-only memory of the central unit to select the address of a memory word.Membership functions are stored and retrieved from a memory according to a method which simplifies addressing and reduces the number of required accesses.
摘要:
A method for recognizing geometric shapes in an image using fuzzy logic. The method includes determining an edge in the image and a gradient of the edge. The gradient is corrected by virtue of a first fuzzy logic process, and the number of points that belong to the curve are determined by virtue of a second fuzzy logic process. A fuzzy device for the recognition of geometric shapes in images that implementing the method includes an edge detector, a fuzzy gradient corrector to correct the gradient, and a fuzzy vote attributor to determine the number of points that belong to the curve.
摘要:
An architecture for an electronic controller operated using fuzzy logic, including an input section with a plurality of inputs for analog or digital signals, a central control unit provided with memories wherein fuzzy logic membership functions are stored, and a defuzzyfier section has its input section composed of a plurality of fuzzyfiers arranged in parallel and independent of one another, each fuzzyfier including an analog input and a digital input for receiving signals from external sensors, and digital outputs connected to the input of a corresponding read-only memory of the central unit to select the address of a memory word.
摘要:
A filter acting on digital image signals for apparatus of the video type includes at least first and second processing units adapted to elect an image edge, each processing unit includes an inferential circuit operating on fuzzy logic, which has first and second input terminals and an output terminal, and first and second comparison elements each having first and second input terminals and an output terminal, the input terminals being intended for receiving discrete digital signals of an image. The output terminals of the first and second comparison elements in the first processing unit are respectively connected to the first and second input terminals of the inferential circuit included in the first processing unit, and the output terminals of the first and second comparison elements in the second processing unit are respectively connected to the first and second input terminals of the inferential circuit included in the second processing unit.
摘要:
A television signal scanning conversion device of the type comprising at least one filtering block having a plurality of digital inputs which receive through an interface components of an interlaced television signal comprises also at lease one calculation block connected to the signal inputs and operating with fuzzy logic. The calculation block is capable of executing a switch between at least two different interpolation procedures, to wit interfield and intrafield.
摘要:
A method for setting up the memories of an electronic controller operated in a fuzzy logic manner whereby membership functions (.mu.(x)) of logic variables are subjected to inference operations which are configured as a set of (IF-THEN) rules, each having at least one fore (IF) preposition and at least one consequent (THEN) implication. The memories prearranged to store the data about a set of membership functions tied to the fore (IF) parts of the (IF-THEN) rules separately from the data associating each logic variable (X) with a corresponding one of the membership functions in said set.