公开(公告)号：US3883737A

公开(公告)日：1975-05-13

申请号：US38095573

申请日：1973-07-20

Applicant: INT COMPUTERS LTD

Inventor： THROSSELL WALTER ROBERT ,  FRYER PAUL RAYMOND

IPC: G06K9/03 ,  G06K9/20 ,  H03K3/351 ,  G06K9/12

CPC classification number: G06K9/03 ,  G06K9/20 ,  H03K3/351

Abstract: Apparatus for assessing the quality of printed characters on a record has a document support arranged beneath a scanning head. The scanning head has a lens arranged to oscillate in a direction parallel to the vertical axis of characters printed on the document. The lens is arranged to focus a character to be evaluated on to a set of photoelectric strips arranged side-byside in a direction perpendicular to the oscillatory movement of the lens, so that a character image is scanned in vertical strips. The lens moving arrangement also has a timing pulse generator so that the character scan is broken into notional zones which, in conjunction with the orientation of the photoelectric strips enables a matrix representation of the recorded character to be generated. The separate output signals from the photoelectric strips are passed to shifting registers whose stages are connected to a storage matrix capable of selecting an idealised character form to be compared with the scanned character. The comparison is carried out over a number of scanning cycles while the position of the document carrying the character is changed and an indication is provided of the least deviation of the scanned character from the idealised character form during the change. The clock pulse generator is arranged so that non-linear clock pulses are generated from a harmonic scan. Signals from a velocity transducer are utilized to drive a voltage controlled pulse generator whose output frequency is proportional to the input voltage.

Abstract translation: 用于评估记录上的打印字符的质量的装置具有布置在扫描头下方的文档支撑。 扫描头具有布置成在与打印在文档上的字符的垂直轴平行的方向上振荡的透镜。 透镜被布置成将要评估的字符聚焦在与透镜的振荡运动垂直的方向上并排布置的一组光电条，从而以垂直条扫描字符图像。 透镜移动装置还具有定时脉冲发生器，使得字符扫描被分解成图形区域，其结合光电条带的取向使得能够生成记录字符的矩阵表示。

公开(公告)号：US3879708A

公开(公告)日：1975-04-22

申请号：US37983373

申请日：1973-07-16

Applicant: INT COMPUTERS LTD

Inventor： FRYER PAUL RAYMOND ,  THROSSELL WALTER ROBERT

IPC: G06K9/03 ,  G06K9/20 ,  G06K9/12

CPC classification number: G06K9/20 ,  G06K9/03 ,  G06K9/2009

Abstract: Apparatus for assessting the quality of printed characters on a record has a document support arranged beneath a scanning head. The scanning head has a lens arranged to oscillate in a direction parallel to the vertical axis of characters printed on the document. The lens is arranged to focus a character to be evaluated on to a set of photoelectic strips arranged side-byside in a direction perpendicular to the oscillatory movement of the lens, so that a character image is scanned in vertical strips. The lens moving arrangement also has a timing pulse generator so that the character scan is broken into notional zones which, in conjunction with the orientation of the photoelectric strips enables a matrix representation of the recorded character to be generated. The separate output signals from the photoelectric strips are passed to shifting registers whose stages are connected to a storage matrix capable of selecting an idealised character form to be compared with the scanned character. The comparison is carried out over a number of scanning cycles while the position of the document carrying the character is changed and an indication is provided of the least deviation of the scanned character from the idealised character form during the change.

Abstract translation: 用于评估打印字符在记录上的质量的装置具有布置在扫描头下方的文档支撑。 扫描头具有布置成在与打印在文档上的字符的垂直轴平行的方向上振荡的透镜。 透镜被布置成将待评估的字符聚焦在垂直于透镜的振荡运动的方向上并排布置的一组光电条，使得字符图像以垂直条扫描。 透镜移动装置还具有定时脉冲发生器，使得字符扫描被分解成图形区域，其结合光电条带的取向使得能够生成记录字符的矩阵表示。 来自光电带的分离的输出信号被传送到移位寄存器，其移位寄存器被连接到能够选择与扫描字符进行比较的理想化字符形式的存储矩阵。 在多个扫描周期中执行比较，同时改变携带文字的文档的位置，并且在改变期间提供扫描字符与理想化字符形式的最小偏差的指示。