var instance = new Vintasoft.Twain.WebAcquiredImageJS(twainDeviceManager, imageId, imageInfo);

var value; // Type: Vintasoft.Twain.WebAcquiredImageIsBlankResultJS

// Parameters
var maxNoiseLevel; // Type: number
var successFunc; // Type: function
var errorFunc; // Type: function

value = instance.isBlankAsync(maxNoiseLevel, successFunc, errorFunc);

function isBlankAsync(
   maxNoiseLevel
Maximum possible value of noise in image in percents. Optimal value is 0.01 (%).
 : number, 
   successFunc
A function that will be executed if request is executed successfully. Function prototype: "successFunc(image, isBlankResult)", where 'image' parameter is an instance of WebAcquiredImageJS class, 'isBlankResult' parameter is an instance of WebAcquiredImageIsBlankResultJS class.
 : Function, 
   errorFunc
A function that will be executed if request is failed. Function prototype: "errorFunc(image, errorMessage)", where 'image' parameter is an instance of WebAcquiredImageJS class, 'errorMessage' parameter is string that describes error.
 : Function
) : WebAcquiredImageIsBlankResultJS;

Parameters

maxNoiseLevel

Maximum possible value of noise in image in percents. Optimal value is 0.01 (%).

successFunc

A function that will be executed if request is executed successfully. Function prototype: "successFunc(image, isBlankResult)", where 'image' parameter is an instance of WebAcquiredImageJS class, 'isBlankResult' parameter is an instance of WebAcquiredImageIsBlankResultJS class.

errorFunc

A function that will be executed if request is failed. Function prototype: "errorFunc(image, errorMessage)", where 'image' parameter is an instance of WebAcquiredImageJS class, 'errorMessage' parameter is string that describes error.

Return Value

This function sends an asynchronous request to check whether an image is blank. If you want to use synchronous request instead of asynchronous request, please use WebAcquiredImageJS.isBlank function.

Reference

WebAcquiredImageJS Class
WebAcquiredImageJS Members