- image_expr
- The identifier column and the image, such as ID, my_image.
- image_table
- The name of the image table.
- string_literal
- A query expression that returns at least two columns. The first column is an identifier for the row and a way to correlate the rows in the returned table to the data in a particular BLOB. It is also the primary index for the returned table, and can be any non-LOB data type. Best practice is to have it be a unique value for each input row, which corresponds to each individual JSON document to be processed by the function. The last column contains the BLOB image.
- column
- OUTPUT
- Options are gray and rgb. The default option is gray.
If the OUTPUT option is gray, then the output columns are Y, X, and GRAY, where GRAY is the gray image value. If the OUTPUT option is rgb, then the output columns are Y, X, RED, GREEN, and BLUE.