Swift 快速图像处理滤波器
我的swift代码中的一个过滤器有问题:光度修改器,其他用于红色、绿色、蓝色和alpha工作的过滤器。如果我使用0作为luminosityModifier值,代码运行时不会出错,但如果我尝试任何其他整数,我会看到错误: 执行被中断,原因:EXC_BAD_指令(代码=EXC_I386_INVOP,子代码=0x0)。这是代码的最后一行Swift 快速图像处理滤波器,swift,image-processing,Swift,Image Processing,我的swift代码中的一个过滤器有问题:光度修改器,其他用于红色、绿色、蓝色和alpha工作的过滤器。如果我使用0作为luminosityModifier值,代码运行时不会出错,但如果我尝试任何其他整数,我会看到错误: 执行被中断,原因:EXC_BAD_指令(代码=EXC_I386_INVOP,子代码=0x0)。这是代码的最后一行 import UIKit let image = UIImage(named: "sample.png")! // Process the image! //
import UIKit
let image = UIImage(named: "sample.png")!
// Process the image!
// The Filter class contains the definition of a simple RGBA variable
class Filter{
var rgba = [UInt8](count:5, repeatedValue: 0)
}
// Here are the 5 filters that can later be selected. By modifying the RGBA values, I intened to serve the requirement to create modifiers to individual filters.
let redFilter: Filter = Filter()
redFilter.rgba[0] = 255
let greenFilter: Filter = Filter()
greenFilter.rgba[1] = 45
let blueFilter: Filter = Filter()
blueFilter.rgba[2] = 255
let alphaFilter: Filter = Filter()
alphaFilter.rgba[3] = 50
// Set luminosity Modifier in desired percentage (%), should be <100 to avoid explosion due to internal rounding
let luminosityModifier = Filter()
luminosityModifier.rgba[4] = 20
class ImageProcessor{
var filterSequenceList: [String] = []
//This Dictionary is later used to accept strings to set the filter the processor will apply.
var filtersAvailable: [String: Filter] = [
"redFilter": redFilter,
"greenFilter": greenFilter,
"blueFilter": blueFilter,
"alphaFilter": alphaFilter,
"luminosityModifier": luminosityModifier
]
func addFilterToSequence(filterName: String){
filterSequenceList.append(filterName)
}
func applyFilters(image: UIImage) -> UIImage{
var filters: [Filter] = []
// A list if filters gets populated according to the array of strings entered.
for name in filterSequenceList{
filters.append(filtersAvailable[name]!)
}
let rgbaImage = RGBAImage(image: image)!
// Loop through each pixel
for y in 0..<rgbaImage.height{
for x in 0..<rgbaImage.width{
let index = y * rgbaImage.width + x
var pixel = rgbaImage.pixels[index]
// Loop through each filter
for filter in filters{
for value in 0...4 {
// RGBA values with value 0 get ignored. This means that 1 needs to be used if you wand that specific value to be very low.
if(filter.rgba[value] != 0 ){
switch value{
case 0:
pixel.red = filter.rgba[value]
rgbaImage.pixels[index] = pixel
case 1:
pixel.green = filter.rgba[value]
rgbaImage.pixels[index] = pixel
case 2:
pixel.blue = filter.rgba[value]
rgbaImage.pixels[index] = pixel
case 3:
pixel.alpha = filter.rgba[value]
rgbaImage.pixels[index] = pixel
case 4:
let red = pixel.red
let green = pixel.green
let blue = pixel.blue
let luminosityModifier = Double(filter.rgba[value])
let relativeluminosity = Double(red) * 0.2126 + Double(green) * 0.7152 + Double(blue) * 0.0722
let transformerRed = (relativeluminosity - Double(green) * 0.7152 - Double(blue) * 0.0722) / 0.2126
let transformerGreen = (relativeluminosity - Double(red) * 0.2126 - Double(blue) * 0.0722 ) / 0.7152
let transformerBlue = (relativeluminosity - Double(red) * 0.2126 - Double(green) * 0.7152 ) / 0.0722
pixel.red = UInt8(transformerRed * luminosityModifier / 100 )
pixel.green = UInt8(transformerGreen * luminosityModifier / 100)
pixel.blue = UInt8(transformerBlue * luminosityModifier / 100)
rgbaImage.pixels[index] = pixel
default:
print("No image changes")
}
}
}
}
}
}
let newImage = rgbaImage.toUIImage()!
return newImage
}
}
//--------------------------------------- Start using the class here--------------------------------
var processor: ImageProcessor = ImageProcessor()
// Use the addFilterToSequence function and pass in one of the strings mentioned below. Using a non-existing filter name will cause a runtime error
// "redFilter"
// "greenFilter"
// "blueFilter"
// "alphaFilter"
// "luminosityModifier"
//processor.addFilterToSequence("redFilter")
//processor.addFilterToSequence("blueFilter")
processor.addFilterToSequence("luminosityModifier")
//processor.addFilterToSequence("greenFilter")
//processor.addFilterToSequence("alphaFilter")
processor.filterSequenceList
processor.applyFilters(image)
导入UIKit
让image=UIImage(名为:“sample.png”)!
//处理图像!
//Filter类包含简单RGBA变量的定义
类过滤器{
变量rgba=[UInt8](计数:5,重复值:0)
}
//下面是以后可以选择的5个过滤器。通过修改RGBA值,我打算满足为单个过滤器创建修饰符的要求。
let redFilter:Filter=Filter()
redFilter.rgba[0]=255
let greenFilter:Filter=Filter()
greenFilter.rgba[1]=45
让blueFilter:Filter=Filter()
blueFilter.rgba[2]=255
让alphaFilter:Filter=Filter()
alphaFilter.rgba[3]=50
//以所需百分比(%)设置亮度修改器,应为UIImage{
变量过滤器:[过滤器]=[]
//根据输入的字符串数组填充筛选器的列表。
对于filterSequenceList中的名称{
filters.append(filtersAvailable[name]!)
}
让rgbaImage=rgbaImage(图像:图像)!
//循环通过每个像素
对于0..中的y,rgba[4]
的索引(4)超出了范围。只有四个元素(从零开始),第四个元素(alpha)位于索引3
至于过滤器本身,我认为您打算使用CILuminosityBlendMode()(并删除试图完全设置其rgba的崩溃线)。它没有其他参数;它只是位于链末端的一个简单的“图像输入图像输出”补丁。除非您打算通过其alpha通道弱地应用它(不确定是否有效;请尝试并查看),然后只需将索引4更改为3,这样您就可以在rgba
数组中设置alpha元素。谢谢Joshua!这正是我需要的。我给了您更高的票数,但我没有足够的信誉点数来注册。另外,很抱歉我延迟响应。我正在度假。