Smoothly changing a focus of a camera between multiple target objects

Abstract

Disclosed herein is a system to smoothly change the focus of a camera between multiple targets. The system can obtain an indication of a target, an indication of a manner of focus transition between a first target and a second target, and camera settings. The system can determine a point associated with the second target, where the point has a property that focusing the camera on the point places the second target in focus, and the point is closer to the current focus point of the camera than a substantial portion of other points having the property. The system can obtain a nonlinear function indicating a second manner of focus transition between the first target and the second target. The system can change the focus of the camera between the first target and the second target by changing the focus of the camera from the current focus point to the determined point based on the nonlinear function.

1 . A method to change a focus of a computer graphics (CG) camera between multiple target objects, the method comprising:
 obtaining an indication of a first target object and a second target object among the multiple target objects,
 wherein the CG camera is configured to transition the focus from the first target object to the second target object; 
   obtaining a nonlinear function indicating a manner of focus transition between the first target object and the second target object; and   changing the focus of the CG camera between the first target object and the second target object based on the nonlinear function.   
     
     
         2 . The method of  claim 1 , comprising:
 determining a point associated with the second target object,
 wherein the point has a property that focusing the CG camera on the point causes the second target object to be in focus, 
 wherein the point associated with the second target object is closer to a current focus point of the CG camera than a substantial portion of other points having the property. 
   
     
     
         3 . The method of  claim 2 , comprising determining the point associated with the second target object including:
 determining a region of acceptable focus associated with the second target object,
 wherein the region of acceptable focus is a region between a nearest object and a farthest object that are in focus in an image formed by the CG camera, 
 wherein the region of acceptable focus indicates a near distance to the CG camera and a far distance to the CG camera, 
 wherein when a focus point of the CG camera is between the near distance and the far distance, an object located between the near distance and the far distance is in focus; and 
   determining the point between the near distance and the far distance substantially closest to the current focus point of the CG camera.   
     
     
         4 . The method of  claim 2 , comprising:
 for a target object among the multiple target objects:
 creating a first distance, a second distance, and an exact distance,
 wherein the first distance and the second distance indicate region within which a focus point of the CG camera can lie and have the target object in focus, 
 wherein the exact distance indicates a distance between the current focus point of the CG camera and the target object; and 
 
 updating which of the first distance, the second distance, and the exact distance are closest to the current focus point of the CG camera. 
   
     
     
         5 . The method of  claim 2 , comprising:
 receiving an input indicating a magnitude of contribution of the point to changing the focus of the CG camera,
 wherein the magnitude can indicate to partially use the point; and 
   changing the focus of the CG camera between the first target object and the second target object by changing the focus of the CG camera from the current focus point to the point associated with the second target object, based on the nonlinear function and the magnitude.   
     
     
         6 . The method of  claim 1 , comprising:
 receiving a user input indicating a magnitude of contribution of the nonlinear function to changing the focus of the CG camera,
 wherein the magnitude can indicate to partially use the nonlinear function; and 
   changing the focus of the CG camera between the first target object and the second target object based on the magnitude of contribution of the nonlinear function.   
     
     
         7 . The method of  claim 1 , wherein the nonlinear function comprises an indication of an animation associated with the manner of focus transition between the first target object and the second target object. 
     
     
         8 . The method of  claim 1 , comprising:
 obtaining the nonlinear function substantially inversely proportional to a distance between the CG camera and a current focus point associated with the CG camera and indicating the manner of focus transition between the first target object and the second target object.   
     
     
         9 . The method of  claim 1 , comprising:
 obtaining the nonlinear function substantially inversely proportional to a square root of a distance between the CG camera and a current focus point associated with the CG camera and indicating the manner of focus transition between the first target object and the second target object.   
     
     
         10 . At least one non-transitory computer-readable storage medium carrying instructions, which, when executed by at least one data processor of a system, cause the system to:
 obtain an indication of a first target object and a second target object,
 wherein a camera is configured to transition a focus from the first target object to the second target object; 
   obtain a nonlinear function indicating a manner of focus transition between the first target object and the second target object; and   change the focus of the camera between the first target object and the second target object based on the nonlinear function.   
     
     
         11 . The non-transitory computer-readable storage medium of  claim 10 , causing the system to:
 determine a point associated with the second target object,
 wherein the point has a property that focusing the camera on the point causes the second target object to be in focus, 
 wherein the point associated with the second target object is closer to a current focus point of the camera than a substantial portion of other points having the property. 
   
     
     
         12 . The non-transitory computer-readable storage medium of  claim 11 , causing the system to determine the point associated with the second target object by:
 determining a region of acceptable focus associated with the second target object,
 wherein the region of acceptable focus is a region between a nearest object and a farthest object that are in focus in an image formed by the camera, 
 wherein the region of acceptable focus indicates a near distance to the camera and a far distance to the camera, 
 wherein when a focus point of the camera is between the near distance and the far distance, an object located between the near distance and the far distance is in focus; and 
   determining the point between the near distance and the far distance substantially closest to the current focus point of the camera.   
     
     
         13 . The non-transitory computer-readable storage medium of  claim 11 , causing the system to:
 for a target object:
 create a first distance, a second distance, and an exact distance,
 wherein the first distance and the second distance indicate region within which a focus point of the camera can lie and have the target object in focus, 
 wherein the exact distance indicates a distance between the current focus point of the camera and the target object; and 
 
 update which of the first distance, the second distance, and the exact distance are closest to the current focus point of the camera. 
   
     
     
         14 . The non-transitory computer-readable storage medium of  claim 11 , causing the system to:
 receive an input indicating a magnitude of contribution of the point to changing the focus of the camera, wherein the magnitude can indicate to partially use the point; and   change the focus of the camera between the first target object and the second target object by changing the focus of the camera from the current focus point to the point associated with the second target object, based on the nonlinear function and the magnitude.   
     
     
         15 . The non-transitory computer-readable storage medium of  claim 10 , causing the system to:
 obtain an indication of a physical camera lens;   retrieve the nonlinear function representing focus behavior of the physical camera lens; and   use the nonlinear function to change the focus of the camera.   
     
     
         16 . The non-transitory computer-readable storage medium of  claim 10 , causing the system to:
 receive a user input indicating a magnitude of contribution of the nonlinear function to changing the focus of the camera,
 wherein the magnitude can indicate to partially use the nonlinear function; and 
   change the focus of the camera between the first target object and the second target object based on the magnitude of contribution of the nonlinear function.   
     
     
         17 . The non-transitory computer-readable storage medium of  claim 10 , wherein the nonlinear function comprises an indication of an animation associated with the manner of focus transition between the first target object and the second target object. 
     
     
         18 . The non-transitory computer-readable storage medium of  claim 10 , causing the system to:
 obtain the nonlinear function substantially inversely proportional to a square root of a distance between the camera and a current focus point associated with the camera and indicating the manner of focus transition between the first target object and the second target object.   
     
     
         19 . A system comprising:
 at least one hardware processor; and   at least one non-transitory memory storing instructions, which, when executed by the at least one hardware processor, cause the system to:
 obtain an indication of a first target object and a second target object,
 wherein a camera is configured to transition a focus from the first target object to the second target object; 
 
 obtain a nonlinear function indicating a manner of focus transition between the first target object and the second target object; and 
 change the focus of the camera between the first target object and the second target object based on the nonlinear function. 
   
     
     
         20 . The system of  claim 19 , comprising instructions to:
 determine a point associated with the second target object,   wherein the point has a property that focusing the camera on the point causes the second target object to be in focus,   wherein the point associated with the second target object is closer to a current focus point of the camera than a substantial portion of other points having the property.   
     
     
         21 . The system of  claim 20 , comprising instructions to determine the point associated with the second target object by:
 determining a region of acceptable focus associated with the second target object,
 wherein the region of acceptable focus is a region between a nearest object and a farthest object that are in focus in an image formed by the camera, 
 wherein the region of acceptable focus indicates a near distance to the camera and a far distance to the camera, 
 wherein when a focus point of the camera is between the near distance and the far distance, an object located between the near distance and the far distance is in focus; and 
   determining the point between the near distance and the far distance substantially closest to the current focus point of the camera.   
     
     
         22 . The system of  claim 20 , comprising instructions to:
 for a target object:
 create a first distance, a second dis object tance, and an exact distance,
 wherein the first distance and the second distance indicate region within which a focus point of the camera can lie and have the target object in focus, 
 wherein the exact distance indicates a distance between the current focus point of the camera and the target object; and 
 
 update which of the first distance, the second distance, and the exact distance are closest to the current focus point of the camera. 
   
     
     
         23 . The system of  claim 20 , comprising instructions to:
 receive an input indicating a magnitude of contribution of the point to changing the focus of the camera,
 wherein the magnitude can indicate to partially use the point; and 
   change the focus of the camera between the first target object and the second target object by changing the focus of the camera from the current focus point to the point associated with the second target object, based on the nonlinear function and the magnitude.   
     
     
         24 . The system of  claim 19 , comprising instructions to:
 obtain an indication of a physical camera lens;   retrieve the nonlinear function representing focus behavior of the physical camera lens; and   use the nonlinear function to change the focus of the camera.   
     
     
         25 . The system of  claim 19 , wherein the nonlinear function comprises an indication of an animation associated with the manner of focus transition between the first target object and the second target object. 
     
     
         26 . The system of  claim 19 , comprising instructions to:
 obtain the nonlinear function substantially inversely proportional to a distance between the camera and a current focus point associated with the camera and indicating the manner of focus transition between the first target object and the second target object.   
     
     
         27 . The system of  claim 19 , comprising instructions to:
 obtain the nonlinear function substantially inversely proportional to a square root of a distance between the camera and a current focus point associated with the camera and indicating the manner of focus transition between the first target object and the second target object.