A grayscale digital image is a two-dimensional raster image in which the picture elements, or pixels, store a single value representing a shade of gray that varies from black to white. In a discrete grayscale image, the shades of gray are represented by integer values in the range [0 to 255], where 0 is black and 255 is white. We can define the Grayscale Image ADT for storing and manipulating discrete grayscale digital images.
Given the description of the operations, provide a complete implementation of the ADT using a 2-D array.
- GrayscaleImage( nrows, ncols ): Creates a new instance that consists of nrows and ncols of pixels each set to an initial value of 0.
- width (): Returns the width of the image.
- height (): Returns the height of the image.
- clear (value ): Clears the entire image by setting each pixel to the given
intensity value. The intensity value will be clamped to 0 or 255 if it is less
than 0 or greater than 255, respectively.
- getitem (row, col): Returns the intensity level of the given pixel. The
pixel coordinates must be within the valid range.
- setitem (row, col, value): Sets the intensity level of the given pixel to the given value. The pixel coordinates must be within the valid range. The intensity value is clamped to 0 or 255 if it is outside the valid range