Content resolution adjustment for passive display devices
Passive display devices such as a passive magnifying device (e.g., a screen magnifier) or a projector (e.g., a built-in mobile phone projector) are useful in enlarging photos, documents, videos, etc. for view for small-sized small-screen device screens. However, optimal content resolution for the small-screen device screens may not be optimal for the passive display devices. Particularly, when a small-screen device receives content from a remote computing device, the initial content resolution may not be optimal even for the small-screen device screen because of low transmission speed and/or low bandwidth of a connection with an original data source. Content resolution adjustment may be performed by determining distance between the passive display device and the small-screen device, calculating magnification ratio for the passive display device, and adjusting the content resolution based on the calculated magnification ratio.
1. A method comprising:
outputting content on a screen of a first device, said content output in a first resolution;
determining one or more capabilities of the screen of the first device;
determining one or more capabilities of a screen of a passive magnifying device;
determining a distance between the first device screen and the screen of the passive magnifying device;
calculating a magnification ratio based on the passive magnifying device focal length and the determined distance; and
adjusting the content on the screen of the first device to a second resolution based on the calculated magnification ratio to provide a preferred view screen resolution of the content on the screen of the passive magnifying device.
2. The method of claim 1 , further comprising:
receiving, by the first device and from a remote computing device, the content in the first resolution and in the second resolution.
3. The method of claim 1 , wherein determining one or more capabilities of the screen of the first device comprises determining a maximum screen resolution, a maximum Pixels Per Inch (PPI), and a screen size of the screen of the first device.
4. The method of claim 3 , further comprising triggering the adjusting from the first resolution to the second resolution by determining that a first PPI associated with the first resolution is below a PPI threshold.
5. The method of claim 4 , further comprising:
determining that a second PPI associated with the second resolution is above a maximum PPI;
adjusting the content on the screen of the first device to a third resolution based on the maximum PPI; and
outputting the content on the screen of the first device, said content output in the third resolution.
6. The method of claim 1 , wherein determining one or more capabilities of the screen of the passive magnifying device comprises determining a focal length, a preferred view screen resolution, and a screen size of the screen of the passive magnifying device.
7. The method of claim 1 , wherein the determining the distance comprises:
turning on a front-facing camera of the first device;
capturing an image of the passive magnifying device screen;
detecting a passive magnifying device screen size in the captured image; and
calculating the distance based on the detected screen size in the captured image, a reference distance, and a reference screen size in a reference image, wherein the reference image is captured with the first device placed at the reference distance from the passive magnifying device.
8. The method of claim 1 , wherein the determining the distance comprises using one of a proximity, ultrasonic, or laser sensor on the first device to measure the distance.
9. The method of claim 1 , further comprising triggering the adjusting from the first resolution to the second resolution by determining that a portion of the content is out of a boundary of the screen of the passive magnifying device.
10. The method of claim 1 , further comprising triggering the adjusting from the first resolution to the second resolution by determining that the first resolution is below a resolution threshold.
11. The method of claim 1 , further comprising triggering the adjusting from the first resolution to the second resolution by receiving a user indication to initiate the adjusting.
12. The method of claim 1 , further comprising:
determining that the second resolution is above a maximum screen resolution; and
outputting the content on the screen of the first device, said content output in the maximum screen resolution.
13. A system comprising:
a camera;
a processor, and
memory storing computer readable instructions that, when executed by the processor, configure the system to perform:
outputting, at a first resolution, content for projection by a projector onto a screen;
determining a distance between the projector and the screen;
calculating a size of the projected content based on the determined distance;
determining a preferred viewing resolution based on the calculated size of the projected content; and
adjusting the outputted content to a second resolution based on the preferred viewing resolution,
wherein the determining a distance between the projector and the screen comprises:
projecting a virtual object onto the screen;
capturing an image of the virtual object using the camera;
detecting a virtual object length in the captured image; and
calculating the distance based on the detected virtual object length in the captured image, a reference distance, and a reference virtual object length in a reference image, wherein the reference image is captured while the projector is placed at the reference distance from the screen.
14. The system of claim 13 , further comprising:
receiving, from a remote computing device, the content in the first resolution and in the second resolution.
15. The system of claim 13 , wherein the determining the distance comprises receiving a user input of the distance between the projector and the screen.
16. The system of claim 13 , wherein calculating the size of the projected content is further based on one or more specifications of the projector.
17. A method comprising:
outputting content on a screen of a first device, said content output in a first resolution;
determining one or more capabilities of the screen of the first device;
determining one or more capabilities of a screen of a passive magnifying device;
determining a distance between the first device screen and the screen of the passive magnifying device;
calculating a preferred viewing resolution based on the passive magnifying device focal length and the determined distance; and
adjusting the content to a second resolution based on the preferred viewing resolution of the content on the screen of the passive magnifying device.
18. The method of claim 17 , wherein calculating the preferred viewing resolution comprises calculating a magnification ratio based on the passive magnifying device focal length and the determined distance.
19. The method of claim 17 , wherein the determining the distance comprises:
turning on a front-facing camera of the first device;
capturing an image of the passive magnifying device screen;
detecting a passive magnifying device screen size in the captured image; and
calculating the distance based on the detected screen size in the captured image.
20. The method of claim 17 , further comprising triggering the adjusting from the first resolution to the second resolution by determining that the first resolution is below a resolution threshold.