Manual focus adjustment apparatus and focus assisting program
AssigneeFUJIFILM Corporation
InventorManabu Hyodo
Life of this patent
Estimating the term…
Abstract
According to the present invention, when a lens is moved in an operation of an operation device, the focal information calculated for each travel position of the lens can be graphed corresponding to the lens position, and the focal information about the current lens position can be identified from the focal information about another position. Thus, a manual focus adjustment can be made while checking the graph. Especially, since the history of the focal information calculated for each lens travel position can be graphed, the lens can travel to the lens position in which a desired peak can be obtained when there are a plurality of peaks of focal information on the graph.
Claims13
A manual focus adjustment apparatus, comprising:
- an operation device which moves a lens for forming an image of a subject on an image pickup device in a manual operation;
- a focal information calculating device which calculates focal information depending on contrast of the subject from an image signal output from the image pickup device each time the lens travels in an operation by the operation device;
- a focal information display device for graphing focal information about each lens position from a starting point to a current point of a manual focus adjustment corresponding to the lens position according to focal information about each lens position calculated by the focal information calculating device, the focal information display device displaying the focal information about the current point and the focal information about another point as possibly identified on the graph;
- and
- a brightness detection device which detects brightness of the subject in the image, wherein the focal information calculating device comprises:
- wherein the focal information calculating device comprises:
- a plurality of high pass filters having different passbands for extracting a contrast component of the subject from an image signal output from the image pickup device;
- and
- a filter selection device which selects from the plurality of high pass filters, a high pass filter for passing a lower frequency component when the brightness of the subject detected by the brightness detection device is lower, and
- the focal information calculating device calculates the focal information by adding up contrast components which pass through the high pass filter selected by the filter selection device.
A non-transitory computer readable recording medium storing a focus assisting program for a computer, connected with an imaging device having an operation device which travels a lens for forming an image of a subject on an image pickup device by manual operation, to which an image signal output from the imaging device is input, wherein when a processor included in the computer reads the program, the processor is configured to execute the functions of:
- inputting information about a position of a lens in an operation of the operation device with an image signal from the imaging device;
- detecting brightness of the subject in the image;
- selecting from a plurality of high pass filters, a high pass filter for passing a lower frequency component when the detected brightness of the subject is lower;
- calculating focal information depending on contrast of a subject according to the inputting image signal each time the lens travels, by adding up contrast components which pass through the selected high pass filter;
- and
- graphing focal information about each lens position from a starting point to a current point of a manual focus adjustment according to the calculated focal information about each lens position on a monitor of the computer corresponding to a lens position so that the focal information at the current point can be identified from the focal information at another point on the graph.
Dependencies are inferred from the claim text.