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Graphical User Interfaces

The following functions, except for image.toDisplayTensor, require package qtlua and can only be accessed via the qlua Lua interpreter (as opposed to the th or luajit interpreter).

[res] image.toDisplayTensor(input, [...])

Optional arguments [...] expand to padding, nrow, scaleeach, min, max, symmetric, saturate. Returns a single res Tensor that contains a grid of all in the images in input. The latter can either be a table of image Tensors of size height x width (greyscale) or nChannel x height x width (color), or a single Tensor of size batchSize x nChannel x height x width or nChannel x height x width where nChannel=[3,1], batchSize x height x width or height x width.

When scaleeach=false (the default), all detected images are compressed with successive calls to image.minmax:

image.minmax{tensor=input[i], min=min, max=max, symm=symmetric, saturate=saturate}

padding specifies the number of padding pixels between images. The default is 0. nrow specifies the number of images per row. The default is 6.

Note that arguments can also be specified as key-value arguments (in a table).

[res] image.display(input, [...])

Optional arguments [...] expand to zoom, min, max, legend, win, x, y, scaleeach, gui, offscreen, padding, symm, nrow. Displays input image(s) with optional saturation and zooming. The input, which is either a Tensor of size HxW, KxHxW or Kx3xHxW, or list, is first prepared for display by passing it through image.toDisplayTensor:

input = image.toDisplayTensor{
   input=input, padding=padding, nrow=nrow, saturate=saturate, 
   scaleeach=scaleeach, min=min, max=max, symmetric=symm
}

The resulting input will be displayed using qtlua. The displayed image will be zoomed by a factor of zoom. The default is 1. If gui=true (the default), the graphical user inteface (GUI) is an interactive window that provides the user with the ability to zoom in or out. This can be turned off for a faster display. legend is a legend to be displayed, which has a default value of image.display. win is an optional qt window descriptor. If x and y are given, they are used to offset the image. Both default to 0. When offscreen=true, rendering (to generate images) is performed offscreen.

[window, painter] image.window([...])

Creates a window context for images. Optional arguments [...] expand to hook_resize, hook_mousepress, hook_mousedoublepress. These have a default value of nil, but may correspond to commensurate qt objects.