| 摘要 |
<p>PURPOSE:To output a video signal not causing uneven luminance for each scanning line regardless of radiation time of an X-ray by providing a means discriminating the radiation time of X-ray and a means revising a luminance level of a video signal in the device. CONSTITUTION:A counter 9 receives an ON signal and an OFF signal, representing start and end of X-ray radiation, of an output of a control block 5 to count the X-ray radiation period to discriminate whether or not the X-ray radiation period is shorter than 3-field period of a television camera 3. When the result of discrimination indicates that the period is shorter than the 3-field period, and for example, the storage period is shorter for an even field period and deficient exposure is discriminated, then a memory control circuit 12 provides an output twice the information not in a field memory 8 storing signals for an even filed period with lower luminance level due to deficient exposure but in a field memory 7 storing signals for an odd field period together with information stored in a line memory 10. Thus, a video image not causing uneven luminance for each scanning line is obtained.</p> |
