JPH05671B

• Main Authors: YAMAUCHI KAZUO, IINO HIROSHI
• Format: Patent
• Language: English
• Published: 06.01.1993
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

PURPOSE:To grasp the moving direction of a school of fish and the change in signs of fish accurately, by displaying the image of a detecting range as a small picture part at a part of a detected image. CONSTITUTION:Detected signals corresponding to a detecting range, which is a part of a detected image, are stored in a small picture part memory 6. At this time, the intensity level of the previous detected signal, which is stored in the memory already, is lowered. The level is compared with the intensity level of the latest detected signal at the same position, which is read out of a video memory 1. The detected signal having the higher intensity level is stored into the memory 6. Therefore, the detected signals in the past and at present are stored in the memory 6 at the different intensity levels. The detected signal in the memory 6 is read out and displayed at a part of a display device 3. Thus the images, which show the changing states from the past to the preset are shown as the small picture part.