1. A variable inlet guide vane assembly for a gas turbine engine, comprising:
an engine casing forming an outer shroud for the inlet guide vane assembly;
an inner facing annular groove formed in the engine casing;
an inner shroud;
a variable guide vane having an airfoil with a leading edge and a trailing edge;
a first pivot pin extending from one of the edges of the airfoil;
a hole in one of the inner or outer casings for the pivot pin to rotate within;
a second pivot pin extending from the other of the edges of the airfoil;
an annular sync ring mounted within the inner facing annular groove for circumferential movement only; and,
rotational and axial movement connection means formed between the inner or outer casing and the first pivot pin to allow for the guide vane to be pivoted about the first pivot pin.
2. The variable inlet guide vane assembly of claim 1, and further comprising:
the rotational and axial movement connection means includes a slider linkage with a spherical piece that slides within a spherical hole formed within the outer shroud and a cylindrical hole formed within the spherical piece in which the pin rotates.
3. The variable inlet guide vane assembly of claim 1, and further comprising:
the sync ring includes a radial pin; and,
a driving linkage connected to the radial pin and to an actuator.
4. The variable inlet guide vane assembly of claim 3, and further comprising:
the actuator that drives the driving linkage is a three vane rotary actuator having a height much less than a diameter.
5. The variable inlet guide vane assembly of claim 3, and further comprising:
the sync ring includes a radial pin that extends through a hole in the casing; and,
a driving linkage connected to each of the radial pin and to an actuator.
6. The variable inlet guide vane assembly of claim 3, and further comprising:
the radial pin on the sync ring extends through a slot formed in the casing; and,
the driving linkage is connected to the radial pin outside of the slot.
7. The variable inlet guide vane assembly of claim 6, and further comprising:
the rotary actuator is a three vane rotary actuator.
8. The variable inlet guide vane assembly of claim 6, and further comprising:
the rotary actuator is powered by pressurized air bled off from one of the stages of the compressor with the low pressure chamber of the actuator connected to atmospheric pressure.
9. The variable inlet guide vane assembly of claim 1, and further comprising:
the second pin extends from the trailing edge of the vane airfoil.
10. The variable inlet guide vane assembly of claim 1, and further comprising:
the inner or outer casing is connected to all of the variable inlet guide vanes through a separate rotational and axial movement connection means.
11. The variable inlet guide vane assembly of claim 1, and further comprising:
the first pin is connected to the leading edge of the vane airfoil.
12. A variable inlet guide vane assembly for a gas turbine engine, comprising:
an annular arrangement of variable inlet guide vanes pivotably mounted within an outer shroud of an engine casing;
the outer shroud having an annular groove formed within the outer shroud;
an annular sync ring secured within the annular groove so that only circumferential motion can occur for the sync ring;
one end of the guide vanes being pivoted within a hole in the outer shroud through a rotational and axial movement connection means to allow for the guide vanes to pivot about the one end; and,
the other end of the guide vanes being connected to the sync ring.
13. The variable inlet guide vane assembly of claim 12, and further comprising:
the rotational and axial movement connection means includes a slider linkage with a spherical piece that slides within a spherical hole formed within the outer shroud and a cylindrical hole formed within the spherical piece in which the pin rotates.
14. The variable inlet guide vane assembly of claim 12, and further comprising:
the trailing edge of each guide vane is connected to the sync ring.
15. The variable inlet guide vane assembly of claim 12, and further comprising:
the sync ring is connected to an actuator through a slot formed within the outer shroud.
16. The variable inlet guide vane assembly of claim 15, and further comprising:
the actuator is a round three vane rotary actuator with a height much less than a diameter.
17. The variable inlet guide vane assembly of claim 16, and further comprising:
the rotary actuator is powered by compressed air bled off from one of the stages of the compressor with a low pressure chamber connected to atmospheric pressure.
The claims below are in addition to those above.
All refrences to claims which appear below refer to the numbering after this setence.
1. An image processing apparatus comprising:
a distortion correction unit configured to perform a distortion correction processing on image data generated and stored in a frame memory;
a distortion correction range calculation unit configured to calculate distortion correction ranges of respective block lines of the image data, each range being a rectangular area that the distortion correction unit uses to perform the distortion correction processing on one block line;
a control unit configured to determine an input image range for the image data that is input as present block line to the distortion correction unit, from present distortion correction range and next distortion correction range, the present distortion correction range having been calculated, by the distortion correction range calculation unit, for the present block line being processed at present in the distortion correction unit, and the next distortion correction range having been calculated, by the distortion correction range calculation unit, for at least one block line following the present block line;
a storage control unit configured to calculate a range for a part of the image data corresponding to the input image range, from the present distortion correction range and the next distortion correction range, the part of the image data being necessary also for the next block line to be processed in the distortion correction unit; and
a margin storage memory configured to store, as margin data, the image data of the range calculated by the storage control unit,
wherein the image data input to the distortion correction unit and corresponding to the input image range includes both the image data read from the frame memory and the margin data read from the margin storage memory.
2. The image processing apparatus according to claim 1, wherein the control unit uses, as the horizontal width of the input image range, a width including both the width of the present distortion correction range, as measured in the horizontal direction, and the width of the next distortion correction range, as measured in the horizontal direction, and uses, as the vertical width of the input image range, the width of the present distortion correction range, as measured in the vertical direction.
3. The image processing apparatus according to claim 1, further comprising a register configured to sequentially hold the distortion correction range calculated in the distortion correction range calculation unit,
wherein the control unit uses, as the present distortion correction range, the distortion correction range held in the register.
4. The image processing apparatus according to claim 2, further comprising a register configured to sequentially hold the distortion correction range calculated in the distortion correction range calculation unit,
wherein the control unit uses, as the present distortion correction range, the distortion correction range held in the register.
5. The image processing apparatus according to claim 3, wherein the distortion correction range calculation unit calculates the present distortion correction range and the next distortion correction range only if the present block line is the uppermost part of the image data, and calculates only the next distortion correction range if the present block line is other than the uppermost part of the image data.
6. The image processing apparatus according to claim 4, wherein the distortion correction range calculation unit calculates the present distortion correction range and the next distortion correction range only if the present block line is the uppermost part of the image data, and calculates only the next distortion correction range if the present block line is other than the uppermost part of the image data.
7. An imaging apparatus comprising:
a lens configured to focus an optical image of an object;
an imaging unit configured to convert the optical image focused by the lens, to image data;
a frame memory configured to store the image data generated in the imaging unit;
a distortion correction unit configured to perform a distortion correction processing on image data stored in a frame memory;
a distortion correction range calculation unit configured to calculate distortion correction ranges of respective block lines of the image data, from distortion data about the lens, each range being a rectangular area that the distortion correction unit uses to perform the distortion correction processing on one block line;
a control unit configured to determine an input image range for the image data that is input as present block line to the distortion correction unit, from present distortion correction range and next distortion correction range, the present distortion correction range having been calculated, by the distortion correction range calculation unit, for the present block line being processed at present in the distortion correction unit, and the next distortion correction range having been calculated, by the distortion correction range calculation unit, for at least one block line following the present block line;
a storage control unit configured to calculate a range for a part of the image data corresponding to the input image range, from the present distortion correction range and the next distortion correction range, the part of the image data being necessary also for the next block line to be processed in the distortion correction unit; and
a margin storage memory configured to store, as margin data, the image data of the range calculated by the storage control unit,
wherein the image data input to the distortion correction unit and corresponding to the input image range includes both the image data read from the frame memory and the margin data read from the margin storage memory.
8. The imaging apparatus according to claim 7, wherein the control unit uses, as the horizontal width of the input image range, a width including both the width of the present distortion correction range, as measured in the horizontal direction, and the width of the next distortion correction range, as measured in the horizontal direction, and uses, as the vertical width of the input image range, the width of the present distortion correction range, as measured in the vertical direction.
9. The imaging apparatus according to claim 7, further comprising a register configured to sequentially hold the distortion correction range calculated in the distortion correction range calculation unit,
wherein the control unit uses, as the present distortion correction range, the distortion correction range held in the register.
10. The imaging apparatus according to claim 8, further comprising a register configured to sequentially hold the distortion correction range calculated in the distortion correction range calculation unit,
wherein the control unit uses, as the present distortion correction range, the distortion correction range held in the register.
11. The imaging apparatus according to claim 9, wherein the distortion correction range calculation unit calculates the present distortion correction range and the next distortion correction range only if the present block line is the uppermost part of the image data, and calculates only the next distortion correction range if the present block line is other than the uppermost part of the image data.
12. The imaging apparatus according to claim 10, wherein the distortion correction range calculation unit calculates the present distortion correction range and the next distortion correction range only if the present block line is the uppermost part of the image data, and calculates only the next distortion correction range if the present block line is other than the uppermost part of the image data.