Character recognition—a review

Touch positions can be detected with a high accuracy. A receiver receives a charge-discharge current signal of a receiving electrode in response to a drive (pulse) signal applied to a transmission electrode, and outputs a level signal of each electrode intersection. The receiver includes an IV converter that converts the charge-discharge current signal to a voltage signal. A conversion characteristic of the IV converter is set such that phases of amplitude of the voltage signal corresponding to a leading edge and a trailing edge of a pulse wave of the drive signal substantially match each other, and phases of amplitude of the voltage signal corresponding to the trailing edge of the pulse wave and a leading edge of a succeeding pulse wave substantially match each other.

Touch screen device

An apparatus and method for human distinction using infrared light, the apparatus includes: a photographing unit, which photographs a subject by radiating or not radiating infrared light onto the subject according to a predetermined control signal; and an image processing unit, which outputs the predetermined control signal, receives images output from the photographing unit to detect a predetermined area in each of the images, compares an infrared image and a non-infrared image of the detected areas, and determines whether the subject is obtained from a real human face or not.

Apparatus and method for human distinction using infrared light

A paper sheet identification device that detects a stain on a paper sheet and identifies the stained condition of the paper sheet includes an area memory (12) that stores therein in advance an area where a stain is to be detected on the paper sheet as a target detection area, a pixel number memory (11) that stores therein in advance the number of pixels of an image printed on the target detection area as the reference number of pixels used as a reference value when being compared, an image reading unit (13) that, based on the target detection area stored in the area memory, reads an image on the target detection area from the paper sheet, a pixel-number detection unit (14) that detects the number of pixels in the image read by the image reading unit as the number of read pixels, and a calculation unit (15) that calculates a stain value that indicates a stained condition on the target detection area of the paper sheet, by comparing the number of read pixels detected by the pixel-number detection unit with the reference number of pixels stored in the pixel number memory.

Paper sheet identification device and paper sheet identification method

A pattern recognition system having inter-pattern spacing correction is disclosed which recognizes words and determines where to place spaces between those words by (a) storing each input character in one or more buffers in memory, (b) comparing the last entry of each buffer against a dictionary of known words, (c) copying last entries which match words to new buffers and placing a space after the last entry in the old buffer, (d) deleting a buffer when a last entry from that buffer does not at least match the beginning of a known word in the dictionary, (e) repeating steps (a) through (d) until all the buffers have been deleted or until an end character, such as a carriage return or period has been stored in each buffer, (f) again comparing the last entries from each buffer to the dictionary and deleting any buffer having a last entry which is not a known word in the dictionary or which does not end with a space followed by an end character, and (g) saving and/or outputting the remaining words. Common words which appear in each buffer, and have therefore been positively identified, can be saved or output to reduce the size of each buffer at any point in the process. Words can either be output in the longest possible combined form or in shorter segmented forms as desired by a user.

Pattern recognition system having inter-pattern spacing correction

A high-performance optical character reader (OCR) capable of reading low-quality stamped alphanumeric characters, on a metal rod, is described in this paper. Reliable and precise recognition is achieved by means of a special scanner and dedicated recognition module. The scanner revolves around the metal rod and detects characters, thus avoiding rotation of the heavy and long rod. Diffused illumination which produces a clear image, a powerful pattern-matching method?the Multiple Similarity Method (MSM)?implemented by the recognition module, and the use of adaptive rescan control results in a correct recognition rate of 99.93 percent. One recognition module can process images from up to five different scanners. The processing speed is about 1.5 s/rod. The design and industrial application of the system are discussed.

Development of a High-Performance Stamped Character Reader

PROBLEM TO BE SOLVED: To consider even the deterioration of a print state when the state of paper sheets on which a prescribed image is printed is identified by deciding the whole stain condition except the stain condition of printed area based on the mean value of density values of each pixel in density data except the printed area extracted by an extracting means. SOLUTION: A printed area extracting part 3 extracts the density data of an object stored in an image memory 2 and outputs it to a printing ink quantity measuring part 5. Also, an unprinted area extracting part 4 extracts image data in the area other than preliminarily decided printed area from the density data stored in the memory 2 and outputs it to a doodle measuring part 8 and a whole stain measuring part 10. The part 5 measures printing ink quantity according to image data in a printed area, and a printed state deterioration condition deciding part 6 decides the deterioration level of a printed state based on the printing ink quantity. Also, stain condition deciding parts 9 and 11 decide respective stain condition levels according to measured results by the parts 8 and 10.

Paper sheets state identifying device, paper sheets stain state identifying device, paper sheets print state identifying device and paper sheets surface and rear identifying device

PURPOSE: To secure general-purpose property and to use effectively a prepared frame image memory of large capacity to attain efficient image processing by dividing the frame image memory for storing an image inputted from an observation system such as a TV camera into areas in accordance with the input image and using the divided areas. CONSTITUTION: When the image pickup condition of a product 1 e.g. is stable and the approximate state of a character describing area in the input image has been previously know, an area is set up so that only the character describing area part in the input image can be stored in a picture memory 4. When the picture information of the partial image area e.g. is to be stored in a partial area M3, chip selecting signals WM3, SM3 are set up and the image signal is written only in the partial storage area M3. The signal read out from the partial storage area M3 and picture-processed is stored in a partial storage area M1 in synchronism with the reading of the image signal. Picture processing is executed in the partial storage areas M1WM4 by repeating said processing and the obtained image signal is transferred. COPYRIGHT: (C)1987,JPO&Japio

Image memory device

PURPOSE: To perform recognition easily and efficiently by employing processing which utilizes hierarchical structure and performing its recognition retrial processing when the result of recognition of a word in some hierarchy is not obtained CONSTITUTION: A word recognizing part 5 is brought under the control of a system control part 10 to calculate 8 the similarity between a candidate word and words registered in a word dictionary, performing word recognition If the result of recognition of a word in some hierarchy of an input word data string is not obtained in the word recognition, at least one of combination processing, omission recovery processing, integration processing, coupling processing, and separation processing which utilize the hierarchical structure is used to perform its recognition retrial processing Consequently, the word data string is recognaized effectively from the relation among the words forming the hierarchical structure of the input word data string Therefore, a word data string for adress display, etc, is recognized effectively COPYRIGHT: (C)1985,JPO&Japio

Word recognition system

PROBLEM TO BE SOLVED: To precisely acquire a necessary character on paper sheets by judging the presence or absence of a character area in a specified area which is set, detecting a connected image without a rift and identifying the character from a character string in the connected image. SOLUTION: The image signal of paper sheets P, which is image-picked up by an image pick up part 1, is converted into a multilevel digital signal in an A/D conversion part 2. Then, a binarization part 3 binarizes it. A labeling coordinate extraction part 4 detects the coordinates of connected images without a rift among binarization images. A projective area setting part 6 sets plural projective areas as specified areas to the binarization image. When a character area judgement part 7 judges the presence of a character area in the projective area, a character detection/segmenting part 5 detects and segments a character fitted to a prescribed condition in the connected image. A character string judgment part 8 supplies a character string having the character fitted to the prescribed condition among the detected characters to a normalization/sampling part 9 and it is normalized/sampled. A character identification part 11 identifies the character of the character string with reference with a character dictionary 12.

Masato Suda

Papers

Development of a High-Performance Stamped Character Reader

Paper sheets state identifying device, paper sheets stain state identifying device, paper sheets print state identifying device and paper sheets surface and rear identifying device

Image memory device

Word recognition system

Paper sheets reader