Endoscope apparatus and method

1. An endoscope apparatus comprising:

an imaging unit which continuously captures a subject image formed by an optical system to create a video signal of a site of observation;

a creating unit which creates a measurement-possible flag indicating whether or not measurement is possible for every frame of image data of the video signal, the measurement-possible flag being created based on information on a state of the endoscope apparatus including all of: (i) a type of the optical system, (ii) whether or not an image process which influences measurement accuracy is being performed, and (iii) a format of the image data;

a recording unit which records video data and control data on a recording medium, wherein the video data comprises the frames of image data, and wherein the control data includes the measurement-possible flag for each of the frames of image data and is used to control a measurement operation;

a reading unit which reads the video data and the control data from the recording medium; and

a measuring unit which determines whether or not the measurement operation is possible based on the measurement-possible flag included in the control data read by the reading unit, and when it is determined that the measurement operation is possible, performs the measurement operation based on the image data of the video data read by the reading unit, wherein the measurement operation is a three-dimensional measurement operation.

2. The endoscope apparatus according to claim 1 , wherein the control data includes optical system type data indicating the type of the optical system.

3. The endoscope apparatus according to claim 1 , wherein the recording unit adds a measurement result to the image data on which the measuring unit performs the measurement operation, and records the measurement result as still image data on the recording medium.

4. The endoscope apparatus according to claim 3 , wherein the recording unit adds first identification information, which is used to identify the still image data corresponding to the image data on which the measuring unit performs the measurement operation, to the video data read by the reading unit, and records the result on the recording medium.

5. The endoscope apparatus according to claim 4 , wherein when the image data measured by the measuring unit is designated in a state in which the reading unit reads, from the recording medium, the control data and the video data containing the first identification information added thereto, the reading unit reads from the recording medium the still image data corresponding to the designated image data based on the first identification information.

6. The endoscope apparatus according to claim 3 , wherein the recording unit adds second identification information, which is used to identify image data in the video data corresponding to the still image data, to the still image data, and records a result of the addition on the recording medium.

7. The endoscope apparatus according to claim 6 , wherein when the video data is designated in a state in which the reading unit reads the still image data from the recording medium, the reading unit begins reading the video data from the image data corresponding to the still image data based on the second identification information.

8. The endoscope apparatus according to claim 3 , wherein the recording unit adds third identification information, which is used to identify image data on which the measuring unit performs the measurement operation, to the video data read by the reading unit, and records a result of the addition on the recording medium.

9. The endoscope apparatus according to claim 8 , further comprising:

a display signal creating unit which creates a display signal for displaying a video based on the video data read by the reading unit;

wherein the reading unit reads the control data and the video data having the third identification information added thereto, and the display signal creating unit creates the display signal for displaying the video and a temporal location of the image data identified by the third identification information.

10. A method of controlling an endoscope apparatus including a processor to perform functions comprising:

continuously capturing a subject image formed by an optical system to create a video signal of a site of observation;

creating a measurement-possible flag indicating whether or not measurement is possible for every frame of image data of the video signal, the measurement-possible flag being created based on information on a state of the endoscope apparatus including all of: (i) a type of the optical system, (ii) whether or not an image process which influences measurement accuracy is being performed, and (iii) a format of the image data;

recording video data and control data on a recording medium, wherein the video data comprises the frames of image data, and wherein the control data includes the measurement-possible flag for each of the frames of image data and is used to control a measurement operation;

reading the video data and the control data from the recording medium; and

determining whether or not the measurement operation is possible based on the measurement-possible flag included in the control data read from the recording medium, and when it is determined that the measurement operation is possible, performing the measurement operation based on the image data of the video data read from the recording medium, wherein the measurement operation is a three-dimensional measurement operation.

11. The endoscope apparatus according to claim 2 , wherein the measuring unit corrects the image data based on correction data corresponding to the type of the optical system indicated by the optical system type data, and performs the measurement operation based on the corrected image data.

12. The endoscope apparatus according to claim 1 , wherein the recording unit records, on the recording medium, data including a header region including the control data and a data region including the frames of image data of the video data.

13. The endoscope apparatus according to claim 1 , wherein the recording unit records, on the recording medium, a plurality of unit data each including one of the frames of image data of the video data and the control data corresponding to the image data.