AUTOMATIC LETTERBOX DETECTION

• Main Author: WILLIS, DONALD HENRY
• Format: Patent
• Language: English; Korean
• Published: 15.06.1999
• Edition: 6
• Subjects: ADVERTISING; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; CALCULATING; COMPUTING; COUNTING; CRYPTOGRAPHY; DISPLAY; EDUCATION; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; SEALS

비디오 디스플레이 시스템은 개별적으로 제1 및 제2화상을 나타내도록 상호간에 관련한 양자화 해상도의 고 및 제레벨에서 제1 및 제2 비디오 신호를 양자화하기 위한 A/D 컨버터(342,346)를 포함한다. 상기 A/D 컨버터(342,346)는 상이한 샘플링율로 동작할 수 있다. 상기 저샘플링율 신호로 표시되는 화상은 다른 화상에 관련하여 서브 샘플링되는 외형을 갖을 수 있다. 비디오 디스플레이는 제1비디오 신호와 함께 동기화된다. 신호 처리회로는 제1 및 제2비디오 신호를 조절하여 상기 비디오 디스플레이보다 작은 크기로 각각 제1 및 제2화상을 나타낸다. 멀티플렉싱 회로(300)는 상기 화상의 나란한 디스플레이에 상기 처리된 비디오신호를 결합시킨다. 양자와 해상도 증대 회로는 저레벨의 양자화 해상도를 갖는 감지된 비디오 신호의 질을 향상시킨다. First and second field type detectors for first and second video signals have outputs indicating whether the video signals have first or second field types. The first video signal is synchronized with the second video signal for a combined display by a synchronous field memory and an asynchronous multiple line memory. The field type of the second video signal is changed when necessary to match the field type of the first video signal to maintain interlace integrity in the combined display. A field type changing circuit, which controls the synchronizing, has a first mode of operation which delays writing a current field of the first field type by one horizontal line period, a second mode of operation which advances writing a current field of the second field type by one horizontal line period and a third mode of operation which maintains a current field type. A comparison of the field type of the second signal to the field type of the first signal results in an output signal indicating one of a plurality of comparison outcomes, wherein the first and second video signals have the same field type, wherein the first video signal has the first field type and the second video signal has the second field type and wherein the first video signal has the second field type and the second video signal ha the first field type. A plurality of selectable interlace correction signals are generated, each being appropriate for one of the plurality of comparison outcomes.