Preprocessing system for pattern recognition

Claim 2

A preprocessing system for pattern recognition comprising a photoelectric conversion scanner for successively scanning elemental points on a surface of a record carrier bearing an original pattern consisting of characters to be read out, said scanner generating video signals corresponding to the original character pattern on the record carrier; a first quantizer connected to the output of said scanner for carrying out quantization for each of the elemental scanned points at a first threshold voltage level of the video signals from said scanner such that the signal representing a character may contain omitted portions, but does not include any substantial read out signal component corresponding to stains present in spaces of said record carrier other than those occupied by said characters; a second quantizer connected to the output of said scanner for carrying out quantization for each of the elemental scanneD points at a second threshold voltage level of the video signals from said scanner such that the signal representing the character does not contain any substantial omissions, but may include read out signal components corresponding to stains present in spaces of said record carrier other than those occupied by said characters; a first storage register, connected to the output of said first quantizer, including a plurality of digital memory elements disposed in relationship corresponding to the elemental scanning points on the record carrier for storing output quantized signals from said first quantizer; a second storage register, connected to the output of said second quantizer, including a plurality of digital memory elements disposed in relationship corresponding to the elemental scanning points on the record carrier for storing output quantized signals from said second quantizer; a pattern signal generating device for generating thickened pattern signals which consist of output signals from the first register together with signals representing the elemental scanned points displaced at least one point vertically and horizontally from the elemental scanned point represented by the output signals from said first register; a logic product pattern forming device for obtaining the logic product of output signals from said thickened pattern forming device and output signals from said second register; and a connected pattern forming device for forming a complete connected pattern signal corresponding to the original character pattern by output signals from said logic product pattern forming device.

Claim 3

A preprocessing system for pattern recognition comprising a photoelectric conversion scanner for successively scanning elemental points on a surface of a record carrier bearing an original pattern consisting of characters to be read out, said scanner generating video signals corresponding to the original character pattern on the record carrier; a first quantizer connected to the output of said scanner for carrying out quantization for each of the elemental scanned points at a first threshold voltage level of the video signals from said scanner such that the signal representing a character may contain omitted portions, but does not include any substantial read out signal component corresponding to stains present in spaces of said record carrier other than those occupied by said characters; a second quantizer connected to the output of said scanner for carrying out quantization for each of the elemental scanned points at a second threshold voltage level of the video signals from said scanner such that the signal representing the character does not contain any substantial omissions, but may include read out signal components corresponding to stains present in spaces of said record carrier other than those occupied by said characters; a first storage register, connected to the output of said first quantizer, including a plurality of digital memory elements disposed in a relationship corresponding to the elemental scanning points on said record carrier for storing output quantized signals from said first quantizer; a second storage register, connected to the output of said second quantizer, including a plurality of digital memory elements disposed in a relationship corresponding to the elemental scanning points on said record carrier for storing output quantized signals from said second quantizer; and a pattern processing circuit connected to the outputs of said registers for producing a character pattern corresponding to the original scanned from said record carrier, which circuit comprises a plurality of OR and AND gates, said OR gates being disposed in a relationship corresponding to the elemental scanning points on said record carrier and having their inputs supplied with ''''1'''' outputs representing character elements on said record carrier and obtained both from that digital memory element of said first register which is provided with its own OR gate and also from AND gates dispLaced at least one point vertically and horizontally from that of the elemental scanned points which is provided with its own OR gate, said AND gates being disposed in a relationship corresponding to the elemental scanning points and having one input supplied with a ''''1'''' output representing a character element on said record carrier obtained from that digital memory element of said second register which corresponds to that of the elemental scanned points which is provided with its own AND gate and the other input supplied with an output signal from that of the OR gates which corresponds to that of the elemental scanned points which is provided with its own AND gate, thereby obtaining the output digital pattern of said AND gates as a character pattern desired to be read out.

Claim 4

A preprocessing system for pattern recognition comprising a photoelectric conversion scanner for successively scanning elemental points on a surface of a record carrier bearing an original pattern consisting of characters to be read out, said scanner generating video signals corresponding to the original character pattern on the record carrier; a first quantizer connected to the output of said scanner for carrying out quantization for each of the elemental scanned points at a first threshold voltage level of the video signals from said scanner such that the signal representing a character may contain omitted portions, but does not include any substantial read out signal component corresponding to stains present in spaces of said record carrier other than those occupied by said characters; a second quantizer connected to the output of said scanner for carrying out quantization for each of the elemental scanned points at a second threshold voltage level of the video signals from said scanner such that the signal representing the character does not contain any substantial omissions, but may include read out signal components corresponding to stains present in spaces of said record carrier other than those occupied by said characters; a first storage register, connected to the output of said first quantizer, including a plurality of digital memory elements disposed in a relationship corresponding to the elemental scanning points on said record carrier for storing output quantized signals from said first quantizer; a second storage register, connected to the output of said second quantizer, including a plurality of digital memory elements disposed in a relationship corresponding to the elemental scanning points on said record carrier for storing output quantized signals from said second quantizer; and a pattern processing circuit connected to the outputs of said registers for producing a character pattern corresponding to the original scanned from said record carrier, which circuit comprises a plurality of OR and AND gates, said OR gates being disposed in a relationship corresponding to the elemental scanning points on said record carrier and having their inputs supplied with ''''1'''' outputs representing character elements on said record carrier and obtained both from that digital memory element of said first register which is provided with its own OR gate and also from AND gates dispLaced at least one point vertically and horizontally from that of the elemental scanned points which is provided with its own OR gate, said AND gates being disposed in a relationship corresponding to the elemental scanning points and having one input supplied with a ''''1'''' output representing a character element on said record carrier obtained from that digital memory element of said second register which corresponds to that of the elemental scanned points which is provided with its own AND gate and the other input supplied with an output signal from that of the OR gates which corresponds to that of the elemental scanned points which is provided with its own AND gate, thereby obtaining the output digital pattern of said AND gates as a character pattern desired to be read out.