Display apparatus, display system, display control method, and non-transitory recording medium

1. A display apparatus, comprising circuitry configured to:

display, on a display, an image including a table;

receive an operation of specifying a range to be edited in the image;

acquire coordinates of grid lines of the table in the range;

identify the grid lines that exist in the range;

acquire information on a color and thickness of the identified grid lines;

display the identified grid lines by increasing the thickness of the identified grid lines or changing the color of the identified grid lines; and

change a color of pixels other than pixels corresponding to the grid lines of the table in the range to a predetermined color.

2. The display apparatus of claim 1 , wherein

the circuitry

acquires a background color of each of one or more closed regions, each of the one or more closed region being one of a region surrounded by corresponding ones of the grid lines or a region surrounded by one or more of the grid lines and one or more of boundary lines of the range, and

changes a color of pixels in each of the one or more closed regions to the background color.

3. The display apparatus of claim 2 , wherein

the circuitry assigns, to each of the one or more closed regions, an address for identifying a corresponding one of the one or more closed regions, and

receives an operation of specifying one of the one or more closed regions as a closed region to be edited.

4. The display apparatus of claim 3 , wherein

the circuitry displays, on the display, a screen for selecting whether to edit characters in the range or to specify one or more of the closed regions to be edited.

5. The display apparatus of claim 2 , wherein

in case that the table in the range includes no grid line, the circuitry changes the color of the pixels in the range to the background color.

6. The display apparatus of claim 1 , wherein

in case that the table in the range includes no grid line, the circuitry changes the color of the pixels in the range to the predetermined color.

7. A display system, comprising:

the display apparatus of claim 1 ; and

a terminal device communicably connected to the display apparatus, the terminal device including terminal device circuitry configured to output on a screen of the display apparatus, the image including the table.

8. A display system, comprising:

the display apparatus of claim 1 ; and

a storage server including storage sever communicably connected to the display apparatus, the storage server including storage server circuitry configured to

store image data representing the image including the table, and

transmit the image data to the display apparatus,

wherein the display apparatus displays the image including the table based on the image data received from the storage server.

9. The display apparatus of claim 1 , wherein

the circuitry

calculate a horizontal distance that is a horizontal length of the range, and a vertical distance that is a vertical length of the range, and

identify a straight line within the range having a length equal to or greater than a value obtained by dividing the horizontal distance or the vertical distance by a predetermined value as the grid lines of the table in the range.

10. A display control method, comprising:

displaying, on a display, an image including a table;

receiving an operation of specifying a range to be edited in the image;

acquiring coordinates of grid lines of the table in the range;

identifying the grid lines that exist in the range;

acquiring information on a color and thickness of the identified grid lines;

displaying the identified grid lines by increasing the thickness of the identified grid lines or changing the color of the identified grid lines; and

changing a color of pixels other than pixels corresponding to the grid lines of the table in the range to a predetermined color.

11. A non-transitory recording medium storing a plurality of instructions which, when executed by one or more processors, causes the processors to perform a method, the method comprising:

displaying, on a display, an image including a table;

receiving an operation of specifying a range to be edited in the image;

acquiring coordinates of grid lines of the table in the range;

identifying the grid lines that exist in the range;

acquiring information on a color and thickness of the identified grid lines;

displaying the identified grid lines by increasing the thickness of the identified grid lines or changing the color of the identified grid lines; and

changing a color of pixels other than pixels corresponding to the grid lines of the table in the range to a predetermined color.