Endoscope system, endoscope apparatus, and processor

An endoscope system that obtains a captured image inside a body cavity while an insertion unit of an endoscope apparatus is inserted into a subject, the endoscope system comprising:

• a pulse oscillator that periodically outputs an oscillation pulse signal;
• a pulse receiver that receives a reflected pulse signal;
• a transmission line that is provided along the insertion unit near an envelope of the insertion unit, the transmission line transmitting the oscillation pulse signal output from the pulse oscillator;
• and
• a processor programmed to:
• obtain a time difference between the oscillation pulse signal and the reflected pulse signal based on the oscillation pulse signal output by the pulse oscillator and the reflected pulse signal received by the pulse receiver;
• and
• calculate an insertion length of the insertion unit based on the obtained time difference;
• and
• output, to an outside, the calculated insertion length of the insertion unit in association with the captured image, the calculated insertion length being output by using each of the oscillation pulse signals that are periodically output, together with a captured image obtained at a timing that corresponds to each of the oscillation pulse signals, in association with the captured image.

A processor that processes a video signal of an inside of a subject, the video signal being obtained by imaging the inside of the subject by using an endoscope apparatus, the processor comprising:

• a time calculating unit that obtains a time difference between an oscillation pulse signal and a reflected pulse signal based on the oscillation pulse signal output by a pulse oscillator and the reflected pulse signal received by a pulse receiver, the oscillation pulse signal and the reflected pulse signal being received from the endoscope apparatus including the pulse oscillator, the pulse receiver, and a transmission line, the pulse oscillator outputting the oscillation pulse signal, the pulse receiver receiving the reflected pulse signal, the transmission line being provided along an insertion unit near an envelope of the insertion unit and transmitting a pulse signal output from the pulse oscillator;
• an insertion length calculating unit that calculates an insertion length of the insertion unit based on the obtained time difference;
• and
• an output unit that outputs the calculated insertion length of the insertion unit, to an outside, together with a captured image obtained in response to a release instruction, in association with the captured image, wherein:
• the pulse oscillator outputs the oscillation pulse signal in response to the release instruction received by an operation unit of the endoscope apparatus;
• and
• the time calculating unit calculates the insertion length of the insertion unit by using the oscillation pulse signal output in response to the release instruction.

A processor that processes a video signal of an inside of a subject, the video signal being obtained by imaging the inside of the subject by using an endoscope apparatus, the processor comprising:

• a time calculating unit that obtains a time difference between an oscillation pulse signal and a reflected pulse signal based on the oscillation pulse signal output by a pulse oscillator and the reflected pulse signal received by a pulse receiver, the oscillation pulse signal and the reflected pulse signal being received from the endoscope apparatus including the pulse oscillator, the pulse receiver, and a transmission line, the pulse oscillator periodically outputting the oscillation pulse signal, the pulse receiver receiving the reflected pulse signal, the transmission line being provided along an insertion unit near an envelope of the insertion unit and transmitting a pulse signal output from the pulse oscillator;
• an insertion length calculating unit that calculates an insertion length of the insertion unit based on the obtained time difference;
• and
• an output unit that outputs, to an outside, the calculated insertion length of the insertion unit in association with the captured image, the calculated insertion length being output by using each of the oscillation pulse signals that are periodically output, together with a captured image obtained at a timing that corresponds to each of the oscillation pulse signals, in association with the captured image.