What is claimed is:
1. A method for compensating for a decrease in the torque constant of a motor comprising:
selecting an initial value of gain of a servo control circuit used to control position of the motor;
adjusting the initial value of the gain to a second value during operation of the servo control circuit in response to a selected parameter; and
scaling a deceleration trajectory used by the servo control circuit to decelerate the motor during a seek operation in relation to the second value of the gain.
2. The method of claim 1, further comprising performing a seek operation to move a member affixed to the motor from an initial position to a destination position using the initial value of gain and accumulating velocity error during the seek operation, and wherein the adjusting step comprises adjusting the gain to the second value in relation to the accumulated velocity error.
3. The method of claim 2, wherein the deceleration trajectory of the scaling step is characterized as a nominal deceleration trajectory, wherein the seek operation of the performing step utilizes a velocity profile including the nominal deceleration trajectory, and wherein the scaling step further comprises providing a scaled deceleration trajectory which decelerates the motor during a subsequent seek at a slower rate than during use of the nominal deceleration trajectory.
4. The method of claim 1, wherein the scaling step comprises:
comparing the second value of the gain to a predetermined threshold; and
adjusting the deceleration trajectory by an amount proportional to a difference between the second value of the gain and the predetermined threshold.
5. A disc drive data storage system comprising:
an actuator which supports a data transducing head adjacent a data recording surface on which a plurality of tracks are defined;
an actuator motor coupled to the actuator and configured to move the head across the data recording surface; and
a servo circuit which outputs current to the actuator motor to carry out a seek to move the head from an initial track to a destination track in accordance with a velocity profile having a nominal deceleration trajectory along which the head is decelerated to reach the destination track, wherein the servo circuit operates to adjust an initial value of gain to a second value in response to a selected parameter, and scales the nominal deceleration trajectory to a derated deceleration trajectory in relation to the second value of the gain.
6. The data storage device of claim 5, wherein the servo circuit accumulates velocity error during the seek and adjusts the initial value of the gain to the second value in relation to the accumulated velocity error.
7. The data storage device of claim 6, wherein the servo circuit compares the second value of the gain to a predetermined threshold and selects the derated deceleration trajectory in relation to a difference between the second value of the gain and the predetermined threshold.
8. A data storage device, comprising:
an actuator which supports a data transducing head adjacent a data recording surface on which a plurality of tracks are defined;
an actuator motor coupled to the actuator and configured to move the head across the data recording surface; and
a servo circuit which outputs current to the actuator motor to carry out a seek to move the head from an initial track to a destination track in accordance with a velocity profile having a nominal deceleration trajectory along which the head is decelerated to reach the destination track, including first means for adjusting an initial value of gain used by the servo circuit during the seek to a second value in response to a selected parameter; and second means for adjusting the nominal deceleration trajectory to a derated deceleration trajectory in relation to the second value of the gain.
9. The data storage device of claim 8, wherein the servo circuit comprises a programmable servo processor and an associated memory device, and wherein the first and second means comprise the programmable servo processor in conjunction with associated programming stored in the associated memory device.
10. The data storage device of claim 8, wherein the servo circuit further accumulates velocity error during the seek and adjusts the initial value of the gain to the second value in relation to the accumulated velocity error.
11. The data storage device of claim 8, wherein the servo circuit compares the second value of the gain to a predetermined threshold and selects the derated deceleration trajectory in relation to a difference between the second value of the gain and the predetermined threshold.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An image display apparatus, comprising:
an image display device configured to display an image;
a setting section configured to allow a user to set image quality adjustment excluding contrast and brightness adjustments of the image; and
an image processing section configured to perform the image quality adjustment of the image according to the setting made by the user, and to perform contrast compensation to maintain a brightness at a center of a specific color region larger than a predetermined size within the image displayed by the image display device, regardless of the setting of the image quality adjustment.
2. An image display apparatus in accordance with claim 1, wherein the image quality adjustment is a sharpness adjustment.
3. An image display apparatus in accordance with claim 1, wherein the specific color is white.
4. An image display apparatus in accordance with claim 1, wherein the image processing section includes:
an image filter configured to perform the image quality adjustment by selecting one of a plurality of filters with different frequency characteristics according to the setting of the image quality adjustment, and to perform filter processing on the image using the selected filter; and
a contrast compensation section configured to perform the contrast compensation upon the image that has undergone the filter processing, using a contrast compensation value related to the selected filter.
5. An image display apparatus in accordance with claim 4, further comprising a contrast adjustment section configured to perform contrast adjustment of the image independently of the contrast compensation section.
6. An image processing device, comprising:
an image filter configured to perform filter processing of an image by using a selected one of a plurality of filters with different frequency characteristics; and
a contrast compensation section configured to perform contrast compensation using a contrast compensation value, related to the selected filter, to maintain a brightness at a center of a specific color region larger than a predetermined size within an image that has undergone the filter processing, regardless of which filter is selected from the plurality of filters.
7. An image processing device in accordance with claim 6, wherein the specific color is white.
8. An image processing device in accordance with claim 6, further comprising a contrast adjustment section configured to perform contrast adjustment of the image independently of the contrast compensation section.
9. An image display apparatus, comprising:
means for displaying an image;
means for allowing a user to set image quality adjustment excluding contrast and brightness adjustments of the image; and
means for performing the image quality adjustment of the image according to the setting made by the user, and for performing contrast compensation to maintain a brightness at a center of a specific color region larger than a predetermined size within the image displayed, regardless of the setting of the image quality adjustment.
10. An image display apparatus in accordance with claim 9, wherein the means for performing image quality adjustment includes:
means for performing the image quality adjustment by selecting one of a plurality of filter means with different frequency characteristics according to the setting of the image quality adjustment, and for performing filter processing on the image using the selected filter means; and
contrast compensation means for performing the contrast compensation upon the image that has undergone the filter processing, using a contrast compensation value related to the selected filter means.
11. An image display apparatus in accordance with claim 10, further comprising contrast adjustment means for performing contrast adjustment of the image independently of the contrast compensation means.
12. An image processing device, comprising:
means for performing filter processing of an image by using a selected one of a plurality of filter means with different frequency characteristics; and
contrast compensation means for performing contrast compensation using a contrast compensation value, related to the selected filter means, to maintain a brightness at a center of a specific color region larger than a predetermined size within an image that has undergone the filter processing, regardless of which filter means is selected from the plurality of filter means.
13. An image processing device in accordance with claim 12, further comprising contrast adjustment means for performing contrast adjustment of the image independently of the contrast compensation section.
14. A method of displaying an image on an image display device, comprising the steps of:
(a) setting a set value for image quality adjustment excluding contrast and brightness adjustments of the image; and
(b) performing the image quality adjustment on the image according to the setting, and performing contrast compensation to maintain a brightness at a center of a specific color region larger than a predetermined size within an image displayed by the image display device, regardless of the setting of the image quality adjustment.
15. A method in accordance with claim 14, wherein the image quality adjustment is a sharpness adjustment.
16. A method in accordance with claim 14, wherein the specific color is white.
17. A method in accordance with claim 14, wherein the step (b) comprising the steps of:
(b1) performing the image quality adjustment by selecting one of a plurality of filters with different frequency characteristics according to the setting of the image quality adjustment, and performing filter processing on the image using the selected filter; and
(b2) performing the contrast compensation upon the image that has undergone the filter processing, using a contrast compensation value related to the selected filter.
18. An image displaying method in accordance with claim 17, further comprising the step of (c) performing contrast adjustment of the image independently of the step (b2).
19. A method of processing image, comprising the steps of:
(a) performing filter processing of an image by using a selected one of a plurality of filters with different frequency characteristics; and
(b) performing contrast compensation using a contrast compensation value, related to the selected filter, to maintain a brightness at a center of a specific color region larger than a predetermined size within an image that has undergone the filter processing, regardless of which filter is selected from the plurality of filters.
20. A method in accordance with claim 18, wherein the specific color is white.
21. A method in accordance with claim 18, further comprising the step of (c) performing contrast adjustment of the image independently of the step (b).