Display processing apparatus for performing image magnification based on touch input and drag input
View Patent ↗An image processing apparatus that displays an image at a touch panel display, detects whether a face image is included in the displayed image, sets a point of the displayed image as a center point for a magnification ratio change based on the detected face image, and controls the touch panel display to change a magnification ratio of the displayed image centered at the center point based on a touch input received at the touch panel display.
1. An information processing apparatus, comprising:
a touch panel display configured to display an image having a magnification ratio to be changed and to receive a touch input on the image; and
circuitry configured to
control the touch panel display to display the image;
determine a center position of the image;
determine, when the touch input is received at a position on the touch panel display on which only the image having the magnification ratio to be changed is displayed, whether the touch input comprises a touch input for changing the magnification ratio of the image; and
if the touch input comprises both the touch input for changing the magnification ratio of the image and a drag input,
change a magnification ratio of the image in accordance with the drag input to expand or reduce the image around the center position,
control the touch panel display to display the image with the changed magnification ratio,
control the touch panel display to display an indicator superimposed on the image and the indicator changing in size at a first rate, based on the magnification ratio and the drag input, concurrently with an expansion or reduction of the image around the center position,
determine whether the drag input has exceeded a distance threshold, and
if the drag input is determined to have exceeded the distance threshold, increase a rate of changing the size of the indicator from the first rate to a second rate that is greater than the first rate.
2. The information processing apparatus of claim 1 , wherein the circuitry is configured to
determine a distance of the drag input; and
change the magnification ratio in accordance with the distance of the drag input.
3. The information processing apparatus of claim 2 , wherein the circuitry is configured to
change the magnification ratio concurrently with the drag input while the drag input is being performed; and
control the touch panel display to change the image with the changed magnification ratio concurrently with the drag input while the drag input is being performed.
4. The information processing apparatus of claim 1 , wherein the circuitry is configured to
determine a direction of the drag input;
increase the magnification ratio if the direction of the drag input is a first direction; and
decrease the magnification ratio if the direction of the drag input is a second direction that is different from the first direction.
5. The information processing apparatus of claim 4 , wherein the first direction and the second direction are opposite directions.
6. The information processing apparatus of claim 5 , wherein the opposite directions are an upward direction and a downward direction.
7. The information processing apparatus of claim 4 , wherein the circuitry is configured to
determine whether the direction of the drag input changes between the first direction and the second direction;
increase the magnification ratio if the direction of the drag input changes from the second direction to the first direction; and
decrease the magnification ratio if the direction of the drag input changes from the first direction to the second direction.
8. The information processing apparatus of claim 1 , wherein the circuitry is configured to detect the touch input for changing the magnification ratio of the image and the drag input as separate input performed on the touch panel display.
9. An image display method, comprising:
displaying an image having a magnification ratio to be changed on a touch panel display;
determining a center position of the image;
receiving a touch input on the image through the touch panel display;
determining, using circuitry, when the touch input is received at a position on the touch panel display on which only the image having the magnification ratio to be changed is displayed, whether the touch input comprises a touch input for changing the magnification ratio of the image; and
if the touch input comprises both the touch input for changing the magnification ratio of the image and a drag input:
changing, using the circuitry, a magnification ratio of the image in accordance with the drag input to expand or reduce the image around the center position;
controlling the touch panel display to display the image with the changed magnification ratio;
controlling the touch panel display to display an indicator superimposed on the image and changing in size at a first rate, based on the magnification ratio and the drag input, concurrently with an expansion or reduction of the image around the center position;
determining whether the drag input has exceeded a distance threshold; and
if the drag input is determined to have exceeded the distance threshold, increasing a rate of changing the size of the indicator from the first rate to a second rate that is greater than the first rate.
10. A non-transitory computer-readable medium including computer program instructions that, when executed by an information processing apparatus, cause the information processing apparatus to perform a method comprising:
displaying an image having a magnification ratio to be changed on a touch panel display;
determining a center position of the image;
receiving a touch input on the image through the touch panel display;
determining, when the touch input is received at a position on the touch panel display on which only the image having the magnification ratio to be changed is displayed, whether the touch input comprises a touch input for changing the magnification ratio of the image; and
if the touch input comprises both the touch input for changing the magnification ratio of the image and the drag input:
changing, using the circuitry, a magnification ratio of the image in accordance with the drag input to expand or reduce the image around the center position;
controlling the touch panel display to display the image with the changed magnification ratio;
controlling the touch panel display to display an indicator superimposed on the image and changing in size at a first rate, based on the magnification ratio and the drag input, concurrently with an expansion or reduction of the image around the center position;
determining whether the drag input has exceeded a distance threshold; and
if the drag input is determined to have exceeded the distance threshold, increasing a rate of changing the size of the indicator from the first rate to a second rate that is greater than the first rate.