초록

A wellbore casing is formed simultaneously with the drilling out of the wellbore.

대표청구항 ▼

A wellbore casing is formed simultaneously with the drilling out of the wellbore. oundary determined by the block boundary determining means in the noise region excluding the noise part outputted from said singular point eliminating means. 9. The block noise detecting apparatus according to claim 6

A wellbore casing is formed simultaneously with the drilling out of the wellbore. oundary determined by the block boundary determining means in the noise region excluding the noise part outputted from said singular point eliminating means. 9. The block noise detecting apparatus according to claim 6, wherein said signal extracting means, said absolute value taking means, said accumulating/adding means, and said periodicity detecting means each execute processing for the video signal in at least one of a horizontal direction and a vertical direction.10. The block noise detecting apparatus according to claim 5, wherein said region determining means distinguishes, with binary values, between a part of the signal difference exceeding the threshold value and a part of the signal difference not exceeding the threshold value.11. The block noise detecting apparatus according to claim 10, further comprising singular point eliminating means for excluding a noise part observed in a predetermined small region of the noise region determined by said region determining means, wherein said block edge controlling means masks the block boundary determined by said block boundary determining means in the noise region excluding the noise part outputted from said singular point eliminating means. 12. The block noise detecting apparatus according to claim 10, wherein said signal extracting means, said absolute value taking means, said accumulating/adding means, and said periodicity detecting means each execute processing for the video signal in at least one of a horizontal direction and a vertical direction.13. The block noise detecting apparatus according to claim 5, further comprising singular point eliminating means for excluding a noise part observed in a predetermined small region of the noise region determined by said region determining means, wherein said block edge controlling means masks the block boundary determined by said block boundary determining means in the noise region excluding the noise part outputted from said singular point eliminating means. 14. The block noise detecting apparatus according to claim 13, wherein said signal extracting means, said absolute value taking means, said accumulating/adding means, and said periodicity detecting means each execute processing for said the video signal in at least one of a horizontal direction and a vertical direction.15. The block noise detecting apparatus according to claim 5, wherein said signal extracting means, said absolute value taking means, said accumulating/adding means, and said periodicity detecting means each execute processing for the video signal in at least one of a horizontal direction and a vertical direction.16. The block noise detecting apparatus according to claim 1, wherein said signal extracting means, said absolute value taking means, said accumulating/adding means, and said periodicity detecting means each execute processing for the sad video signal in at least one of a horizontal directional and a vertical direction.17. The block noise detecting apparatus according to claim 16, wherein, when each of the processing is executed for the video signal in the vertical direction, said periodicity detecting means successively changes frames of the video signal used for detection according to a format of the video signal to be inputted. 18. A block noise eliminating apparatus for detecting and eliminating, from a digital video signal subjected to lossy encoding on a predetermined image block basis, block noise caused by decoding the video signal, said block noise elimination apparatus comprising: signal extracting means for receiving the video signal and extracting only a high frequency component from the video signal; absolute value taking means for taking an absolute value of a high frequency component signal outputted from said signal extracting means; accumulating/adding means for accumulating/adding an absolute value signal outputted from said absolute value taking means for a predetermined period; periodicity detecting means fo